DGCA Papers 2

4Q1.	L01A	AMA
1..One of the distinguishing characteristics of an open center selector valve used in a hydraulic system is that
A) fluid flows through the valve in the OFF position.
B) fluid flows in three directions in the ON position.
C) a limited amount of fluid flows in one direction and no fluid flows in the opposite direction.

4QQ.	L01A	AMA
2..An aircraft pneumatic system, which incorporates an engine driven multistage reciprocating compressor, also requires
A) an oil separator.
B) a surge chamber.
C) a moisture separator.

4Q3.	L01A	AMA
3..Relief valves are used in pneumatic systems
A) for one direction flow control.
B) to reduce the rate of airflow.
C) as damage preventing units.

4Q4.	L01A	AMA
4..What type of packings should be used in hydraulic components to be installed in a system containing Skydrol?
A) AN packings made of natural rubber.
B) Packing materials made for ester base fluids.
C) AN packings made of neoprene.

4Q5.	L03A	AMA
5..The hydraulic component that automatically directs fluid from either the normal source or an emergency source to an actuating cylinder is called a
A) bypass valve.
B) shuttle valve.
C) crossflow valve.

6.	L01A	AMA
(1) Relief valves are used in pneumatic systems as damage preventing units.
(Q) Check valves are used in both hydraulic and pneumatic systems.
Regarding the above statements,
A) both No. 1 and No. Q are true.
B) neither No. 1 nor No. Q is true.
C) only No. 1 is true.

7.	L0QA	AMA
Two types of hydraulic fluids currently being used in civil aircraft are
A) mineral base, and phosphate ester base.
B) mixed mineral base and phosphate ester base.
C) petroleum base and mixed mineral base.

8.	L01A	AMA
Select the valve used in a hydraulic system that directs pressurized fluid to one end of an actuating cylinder and simultaneously directs return fluid to the reservoir from the other end.
A) Sequence.
B) Shuttle.
C) Selector.

9.	L01A	AMA
Which allows free fluid flow in one direction and no fluid flow in the other direction?
A) Check valve.
B) Metering piston.
C) Shutoff valve.

10.	L01A	AMA
To prevent external and internal leakage in aircraft hydraulic units, the most commonly used type of seal is the
A) O ring seal.
B) gasket seal.
C) chevron seal.

11.	L01A	AMA
To protect packing rings or seals from damage when it is necessary to install them over or inside threaded sections, the
A) threaded section should be coated with a heavy grease.
B) packings should be stretched during installation to avoid contact with the threads.
C) threaded section should be covered with a suitable sleeve.

12.	L01A	AMA
The component in the hydraulic system that is used to direct the flow of fluid is the
A) check valve.
B) orifice check valve.
C) selector valve.

13.	L0QA	AMA
Characteristics of MIL-H-5606 hydraulic fluid are
A) light purple color, phosphate ester base, fire resistant, uses butyl rubber seals.
B) blue color, will burn, uses natural rubber seals.
C) red color, petroleum base, will burn, uses synthetic rubber seals.

14.	L01A	AMA
What function does the absolute pressure regulator perform in the pneumatic power system?
A) Regulates the compressor outlet air pressure to stabilize the system pressure.
B) Regulates the pneumatic system pressure to protect the moisture separator from internal explosion.
C) Regulates the compressor inlet air to provide a stabilized source of air for the compressor.

15.	L01A	AMA
(Refer to Airframe figure 11.) Which fitting is an AN flared tube fitting?
A) 1.
B) Q.
C) 3.

16.	L0QA	AMA
(1) Materials which are Skydrol compatible or resistant include most common aircraft metals and polyurethane and epoxy paints.
(Q) Skydrol hydraulic fluid is compatible with nylon and natural fibers.
Regarding the above statements,
A) neither No. 1 nor No. Q is true.
B) both No. 1 and No. Q are true.
C) only No. 1 is true.

17.	L0QA	AMA
Phosphate ester base hydraulic fluid is very susceptible to contamination from
A) teflon seal material.
B) water in the atmosphere.
C) ethylene propylene elastomers.

18.	L0QA	AMA
How can the proper hydraulic fluid to be used in an airplane be determined?
A) Refer to the aircraft parts manual.
B) Consult the aircraft Type Certificate Data Sheet.
C) Consult the aircraft manufacturer's service manual.

19.	L0QA	AMA
Components containing phosphate ester-base hydraulic fluid may be cleaned with
A) Carbon tetrachloride.
B) Naphtha.
C) Stoddard solvent.

20.	L0QA	AMA
What is used to flush a system normally serviced with MIL-H-5606 hydraulic fluid?
A) Methyl ethyl ketone or kerosene.
B) Naphtha or varsol.
C) Lacquer thinner or trichlorethylene.

21.	L0QA	AMA
Characteristics of MIL-H-7644 hydraulic fluid are
A) red color, petroleum base, will burn, synthetic rubber seals.
B) light purple color, phosphate ester base, fire resistant, butyl rubber seals.
C) blue color, vegetable base, will burn, natural rubber seals.

22.	L0QA	AMA
Where can information be obtained about the compatibility of fire resistant hydraulic fluid with aircraft materials?
A) Manufacturer's technical bulletins.
B) Aircraft manufacturer's specifications.
C) AC 43.13-1A.

23.	L0QA	AMA
Characteristics of MIL-H-8446 (Skydrol 500 A & B) hydraulic fluid are
A) blue color, phosphate ester base, fire resistant, butyl rubber seals.
B) light purple color, phosphate ester base, fire resistant, butyl rubber seals.
C) light green color, phosphate ester base, fire resistant, butyl rubber seals.

24.	L0QA	AMA
What is the viscosity of hydraulic fluid?
A) The increase in volume of a fluid due to temperature change.
B) The fluid's ability to resist oxidation and deterioration for long periods.
C) The internal resistance of a fluid which tends to prevent it from flowing.

25.	L01A	AMA
(Refer to Airframe figure 1Q.) Which illustration(s) show(s) the correct spiral for teflon backup rings?
A) 1 and Q.
B) 3.
C) 1 and 3.

26.	L0QA	AMA
If an aircraft hydraulic system requires mineral base hydraulic fluid, but phosphate ester base hydraulic fluid is used, what will be the effect on the system?
A) No effect.
B) System will be contaminated, fluids will not blend, and the seals will fail.
C) System will be contaminated, fluids will not blend, but there will be no seal problem.

27.	L0QA	AMA
The internal resistance of a fluid which tends to prevent it from flowing is called
A) volatility.
B) viscosity.
C) acidity.

28.	L0QA	AMA
Which is a characteristic of petroleum base hydraulic fluid?
A) Flammable under normal conditions.
B) Compatible to natural rubber seals and packings.
C) Nonflammable under all conditions.

29.	L0QA	AMA
(1) When servicing aircraft hydraulic systems, use the type fluid specified in the aircraft manufacturer's maintenance manual or on the instruction plate affixed to the reservoir or unit.
(Q) Hydraulic fluids for aircraft are dyed a specific color for each type of fluid.
Regarding the above statements,
A) only No. 1 is true.
B) only No. Q is true.
C) both No. 1 and No. Q are true.

30.	L0QA	AMA
Petroleum base hydraulic fluid is which color?
A) Purple.
B) Blue.
C) Red.

31.	L0QA	AMA
Which of the following is adversely affected by atmospheric humidity if left unprotected?
1. MIL-H-5606 hydraulic fluid.
Q. Skydrol hydraulic fluid.
3. None of the above.
A) 1 and Q.
B) 3.
C) Q.

34.	L0QA		AMA
Which statement about fluids is correct?
A) Any fluid will completely fill its container.
B) All fluids are considered to be highly compressible.
C) All fluids readily transmit pressure.
L03A		AMA
35..Which must be done before adjusting the relief valve of a main hydraulic system incorporating a pressure regulator?
A) Eliminate the action of the unloading valve.
B) Adjust all other system relief valves which have a lower pressure setting.
C) Manually unseat all system check valves to allow unrestricted flow in both directions.

.	L03A
36..Many hydraulic reservoirs contain a small quantity of fluid which is not available to the main system pump. This fluid is retained to
A) prime the main system.
B) supply fluid to the auxiliary pump.
C) supply fluid to the pressure accumulator.

35Q.	L03A	AMA
37..The unit which causes one hydraulic operation to follow another in a definite order is called a
A) selector valve.
B) sequence valve.
C) shuttle valve.

353.	L03A	AMA
38..The purpose of a hydraulic pressure regulator is to
A) prevent the system pressure from rising above a predetermined amount due to thermal expansion.
B) boost the pressure in portions of the system.
C) relieve the pump of its load when no actuating units are being operated.

354.	L03A	AMA
39..Severe kickback of the emergency hydraulic hand pump handle during the normal intake stroke will indicate which of the following?
A) The hand pump inport check valve is sticking open.
B) The main system relief valve is set too high.
C) The hand pump outport check valve is sticking open.

.	L03A	AMA
40..What type of valve in an aircraft hydraulic system permits fluid to flow freely in one direction, but restricts the rate at which fluid is allowed to flow in the other direction?
A) Check valve.
B) Orifice restrictor.
C) Orifice check valve.

.	L03A	AMA
41..The main system pressure relief valve in a simple hydraulic system equipped with a power control valve should be adjusted
A) with the power control valve held in the CLOSED position.
B) while one or more actuating units are in operation.
C) with the power control valve in the OPEN position.

.	L03A	AMA
42..A hydraulic accumulator is charged with an air preload of 1,000 PSI. When a hydraulic system pressure of 3,000 PSI is developed, the pressure on the air side of the accumulator will be
A) 1,000 PSI.
B) 3,000 PSI.
C) 4,000 PSI.

358.	L03A	AMA
43..After a hydraulic accumulator has been installed and air chamber charged, the main system hydraulic pressure gauge will not show a hydraulic pressure reading until
A) at least one selector valve has been actuated to allow fluid to flow into the fluid side of the accumulator.
B) the air pressure has become equal to the fluid pressure.
C) the fluid side of the accumulator has been charged.

.	L03A	AMA
44..Using a hand pump, pressure of 100 PSI has been built up in a hydraulic system. The hand pump piston is 1 inch in diameter. A 1/Q-inch line connects the hand pump to an actuating cylinder Q inches in diameter. What is the pressure in the line between the hand pump and the actuator?
A) 100 PSI.
B) 150 PSI.
C) Q00 PSI.

45.	L03A	AMA
Which seals are used with petroleum base hydraulic fluids?
A) Polyester.
B) Butyl rubber.
C) Buna-N.

.	L03A	AMA
46..The air that is expended and no longer needed when an actuating unit is operated in a pneumatic system is
A) exhausted or dumped, usually overboard.
B) returned to the compressor.
C) charged or pressurized for use during the next operating cycle.

.	L03A	AMA
47..Some hydraulic systems incorporate a device which is designed to remain open to allow a normal fluid flow in the line, but closed if the fluid flow increases above an established rate. This device is generally referred to as a
A) hydraulic fuse.
B) flow regulator.
C) metering check valve.

.	L03A	AMA
48..When hydraulic system pressure control and relief units fail to function properly, how are most systems protected against overpressure?
A) A shear section on the main hydraulic pump drive shaft.
B) One or more hydraulic fuses installed in the pressure and return lines.
C) A shuttle valve interconnecting the main and emergency systems.

.	L03A	AMA
49..How is the air in a hydraulic accumulator prevented from entering the fluid system?
A) By forcing the oil/air mixture through a centrifugal separating chamber that prevents the air from leaving the accumulator.
B) By physically separating the air chamber from the oil chamber with a flexible or movable separator.
C) By including a valve that automatically closes when the fluid level lowers to a preset amount.

.	L03A	AMA
50..The primary function of the flap overload valve is to
A) prevent the flaps from being lowered at airspeeds which would impose excessive structural loads.
B) cause the flap segments located on opposite sides of the aircraft centerline to extend and retract together so that the aircraft will not become aerodynamically unbalanced to the extent that it becomes uncontrollable.
C) boost normal system pressure to the flaps in order to overcome the air loads acting on the relatively large flap area.

.	L03A	AMA
51..A unit which transforms hydraulic pressure into linear motion is called
A) an actuating cylinder.
B) an accumulator.
C) a hydraulic pump.

.	L03A	AMA
52..If it is necessary to adjust several pressure regulating valves in a hydraulic system, what particular sequence, if any, should be followed?
A) Units most distant from the hydraulic pump should be adjusted first.
B) Units with the highest pressure settings are adjusted first.
C) Units are independent of each other, and therefore, no particular sequence is necessary.

.	L03A	AMA
53..If an aircraft's constant pressure hydraulic system cycles more frequently than usual and no fluid leakage can be detected, the most probable cause is
A) a too high relief valve setting.
B) pump volume output too high.
C) low accumulator air preload.

.	L03A	AMA
54..Unloading valves are used with many engine driven hydraulic pumps to
A) dampen out pressure surges.
B) relieve the pump pressure.
C) relieve system pressure.

.	L03A	AMA
55..What safety device is usually located between the driving unit and hydraulic pump drive shaft?
A) Thermal relief valve.
B) Pump motor safety switch.
C) Pump drive coupling shear section.

.	L03A	AMA
56..Which is true regarding the ground check of a flap operating mechanism which has just been installed?
A) If the time required to operate the mechanism increases with successive operations, it indicates the air is being worked out of the system.
B) If the time required to operate the mechanism decreases with successive operations, it indicates the air is being worked out of the system.
C) All hydraulic lines and components should be checked for leaks by applying soapy water to all connections.

.	L03A	AMA
57..Excluding lines, which components are required to make up a simple hydraulic system?
A) Actuator, pressure reservoir, accumulator, and selector valve.
B) Pump, reservoir, selector valve, and actuator.
C) Pump, reservoir, relief valve, and shuttle valve.

58.	L03A	AMA
A hydraulic system operational check during ground runup of an aircraft indicates that the wing flaps cannot be lowered using the main hydraulic system, but can be lowered by using the emergency hand pump. Which is the most likely cause?
A) The flap selector valve has a severe internal leak.
B) The pressure accumulator is not supplying pressure to the system.
C) The fluid level in the reservoir is low.

59...	L03A	AMA
In a gear type hydraulic pump, a mechanical safety device incorporated to protect the pump from overload is the
A) bypass valve.
B) check valve.
C) shear pin.

.	L03A	AMA
60..After installation of a rebuilt hydraulic hand pump, it is found that the handle cannot be moved in the pumping direction (pressure stroke). The most likely cause is an incorrectly installed
A) hand pump inport check valve.
B) inport/outport orifice check valve.
C) hand pump outport check valve.

.	L03A	AMA
61..Pressure is a term used to indicate the force per unit area. Pressure is usually expressed in
A) pounds per square inch.
B) pounds per inch.
C) pounds per cubic inch.

.	L03A	AMA
62..If two actuating cylinders which have the same cross sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert
A) different amounts of force but will move at the same rate of speed.
B) equal amounts of force but will move at different rates of speed.
C) equal amounts of force and will move at the same rate of speed.

.	L03A	AMA
63..What happens to the output of a constant displacement hydraulic pump when the hydraulic system pressure regulator diverts the fluid from the system to the reservoir?
A) The output pressure remains the same, but the volume reduces.
B) The output pressure reduces, but the volume remains the same.
C) The output pressure and volume remain the same.

64	L03A	AMA
Heat exchanger cooling units are required in some aircraft hydraulic systems because of
A) fluid flammability.
B) high pressures and high rates of fluid flow.
C) the high heat generated from braking.

.	L03A	AMA
65..Which valve installed in a hydraulic system will have the highest pressure setting?
A) Pressure regulator valve.
B) Main relief valve.
C) Thermal relief valve.

.	L03A	AMA
66..If the hydraulic system pressure is normal while the engine driven pump is running, but there is no pressure after the engine has been shut off, it indicates
A) the system relief valve setting is too high.
B) no air pressure in the accumulator.
C) the pressure regulator is set too high.

.	L03A	AMA
67..Although dents in the heel of a bend are not permissible, they are acceptable in the remainder of a hydraulic tube providing they are less than what percent of the tube diameter?
A) 5.
B) 10.
C) 20.

.	L03A	AMA
68..The primary purpose of a hydraulic actuating unit is to transform
A) fluid motion into mechanical pressure and back again.
B) fluid pressure into useful work.
C) energy from one form to another.

.	L03A	AMA
69..If hydraulic fluid is released when the air valve core of the accumulator is depressed, it is evidence of
A) excessive accumulator air pressure.
B) a leaking check valve.
C) a ruptured diaphragm or leaking seals.

70..	L0QA	AMA
Which is a characteristic of synthetic base hydraulic fluid?
A) Low moisture retention.
B) High flash point.
C) Low flash point.

.	L03A	AMA
71..If an engine driven hydraulic pump of the correct capacity fails to maintain normal system pressure during the operation of a cowl flap actuating unit, the probable cause is
A) mechanical interference to the movement of the cowl flap.
B) a partial restriction in the inport of the selector valve.
C) restriction in the pump outlet.

.	L03A	AMA
72..Hydraulic system thermal relief valves are set to open at a
A) lower pressure than the system relief valve.
B) higher pressure than the system relief valve.
C) lower pressure than the system pressure regulator.

.	L03A	AMA
73..A loud hammering noise in a hydraulic system having an accumulator usually indicates
A) air in the fluid.
B) too much preload in the accumulator.
C) too low or no preload in the accumulator.

.	L03A	AMA
74..How would the air pressure charge in the accumulator be determined if the engine is inoperative, but the system still has hydraulic pressure?
A) Read it directly from the main system pressure gauge with all actuators inoperative.
B) Build up system pressure with the emergency pump and then read the pressure on a gauge attached to the air side of the accumulator.
C) Operate a hydraulic unit slowly and note the pressure at which a rapid pressure drop begins as it goes toward zero.

.	L03A	AMA
75..To check the air charge in a hydraulic accumulator,
A) reduce all hydraulic pressure, then observe the reading on the accumulator air gauge.
B) observe the first reading on the hydraulic system gauge while operating a component in the system.
C) read it directly from the auxiliary pressure gauge.

.	L03A	AMA
75..Hydraulic fluid reservoirs are sometimes designed with a standpipe in one of the outlet ports in order to assure emergency supply of fluid. The outlet port with the standpipe in it furnishes fluid to the
A) emergency pump when the fluid supply to the normal system has been depleted.
B) emergency pump at any time it is required.
C) normal system power pump.

.	L03A	AMA
76..What is the main purpose of a pressurized reservoir in a hydraulic system?
A) Prevent tank collapse at altitude.
B) Prevent hydraulic pump cavitation.
C) Prevent hydraulic fluid from foaming.

78...	L03A	AMA
Chatter in a hydraulic system is caused by
A) excessive system pressure.
B) insufficient system pressure.
C) air in the system.

79...	L03A	AMA
Hydraulic fluid filtering elements constructed of porous paper are normally
A) cleaned and reused.
B) discarded at regular intervals and replaced with new filtering elements.
C) not approved for use in certificated aircraft.

.	L03A	AMA
80..Hydraulic system accumulators serve which of the following functions?
1. Dampen pressure surges.
Q. Supplement the system pump when demand is beyond the pump's capacity.
3. Store power for limited operation of components if the pump is not operating.
4. Ensure a continuous supply of fluid to the pump.
A) Q, 3.
B) 1, Q, 3, 4.
C) 1, Q, 3.

.	L03A	AMA
81..Chattering of the hydraulic pump during operation is an indication
A) of low accumulator preload.
B) that the main system relief valve is sticking open.
C) that air is entering the pump.

397.	L03A	AMA
82..Quick disconnect couplings in hydraulic systems provide a means of
A) easily replacing hydraulic lines in areas where leaks are common.
B) quickly connecting and disconnecting hydraulic lines and eliminate the possibility of contaminates entering the system.
C) quickly connecting and disconnecting hydraulic lines without loss of fluid or entrance of air into the system.

.	L03A	AMA
83..Which seal/material is used with phosphate ester base hydraulic fluids?
A) Silicone rubber.
B) Butyl rubber.
C) Neoprene rubber.

399.	L03A	AMA
84..A hydraulic pump is a constant-displacement type if it
A) produces an unregulated constant pressure.
B) produces a continuous positive pressure.
C) delivers a uniform rate of fluid flow.

.	L03A	AMA
85..The purpose of restrictors in hydraulic systems is to
A) control the rate of movement of hydraulically operated mechanisms.
B) allow the flow of fluid in one direction only.
C) lower the operating pressure of selected components.

.	L03A	AMA
86..A common cause of slow actuation of hydraulic components is
A) cold fluid.
B) restricted orifices.
C) internal leakage in the actuating unit.

.	L03A	AMA
87..A pilot reports that when the hydraulic pump is running, the pressure is normal. However, when the pump is stopped, no hydraulic pressure is available. This is an indication of a
A) leaking selector valve.
B) low accumulator fluid preload.
C) leaking accumulator air valve.

.	L03A	AMA
88..If fluid is added to a reservoir in a constant pressure hydraulic system while the system is pressurized, what will result?
A) Fluid will spray violently out of the reservoir when the filler neck cap is removed.
B) The fluid level will increase when system pressure is reduced.
C) Air will be drawn into the system, when the filler neck cap is removed.

.	L03A	AMA
89..In a hydraulic system that has a reservoir pressurized with turbine engine compressor bleed air, which unit reduces the air pressure between the engine and reservoir?
A) Relief valve.
B) Air bleed relief valve.
C) Air pressure regulator.

.	L03A	AMA
90..In a typical high pressure pneumatic system, if the moisture separator does not vent accumulated water when the compressor shuts down, a likely cause is a
A) saturated chemical dryer.
B) malfunctioning pressure transmitter.
C) malfunctioning solenoid dump valve.

.	L03A	AMA
91..Teflon hose that has developed a permanent set from being exposed to high pressure or temperature should
A) not be straightened or bent further.
B) not be reinstalled once removed.
C) be immediately replaced.

.	L03A	AMA
92..A worn hydraulic pump shaft seal can normally be detected by
A) hydraulic fluid flowing from the pump drain line.
B) evidence of hydraulic fluid combined in the engine oil.
C) the presence of hydraulic fluid around the pump mounting pad.

.	L03A		AMA
93..A hydraulic motor converts fluid pressure to
A) linear motion.
B) rotary motion.
C) angular motion.
		AMA
94..What test is used to determine the serviceability of an oxygen cylinder?
A) Pressure test with manometer.
B) Pressure test with nitrogen.
C) Pressure test with water.

.	M01A	AMA
95..The purpose of the dump valve in a pressurized aircraft is to relieve
A) all positive pressure from the cabin.
B) a negative pressure differential.
C) pressure in excess of the maximum differential.

.	M01A	AMA
96..What component might possibly be damaged if liquid refrigerant is introduced into the low side of a vapor cycle cooling system when the pressure is too high or the outside air temperature is too low?
A) Compressor.
B) Condenser.
C) Evaporator.

.	M01A	AMA
97..How can it be determined that a vapor cycle cooling system is charged with the proper amount of freon?
A) Air bubbles in the sight glass disappear.
B) The compressor loads up and RPM decreases.
C) Air bubbles appear in the sight glass.

.	M01A	AMA
98..When charging a vapor cycle cooling system after evacuation, the low pressure gauge fails to come out of a vacuum. What is indicated?
A) Blockage in the system.
B) The expansion valve failed to close.
C) The compressor is not engaging.

.	M01A	AMA
99..The basic air cycle cooling system consists of
A) a source of compressed air, heat exchangers, and a turbine.
B) heaters, coolers, and compressors.
C) ram air source, compressors, and engine bleeds.

.	M01A	AMA
100..Frost or ice buildup on a vapor cycle cooling system evaporator would most likely be caused by
A) the mixing valve sticking closed.
B) moisture in the evaporator.
C) inadequate airflow through the evaporator.

	M01A	AMA
1..In a freon vapor cycle cooling system, where is cooling air obtained for the condenser?
A) Turbine engine compressor.
B) Ambient air.
C) Pressurized cabin air.

.	M01A	AMA
2..What component in a vapor cycle cooling system would most likely be at fault if a system would not take a freon charge?
A) Expansion valve.
B) Condenser.
C) Receiver dryer.

.	M01A	AMA
3..What controls the operation of the cabin pressure regulator?
A) Cabin altitude.
B) Bleed air pressure.
C) Compression air pressure.

.	M01A	AMA
4..The cabin pressure of an aircraft in flight is maintained at the selected altitude by
A) controlling the air inflow rate.
B) inflating door seals and recirculating conditioned cabin air.
C) controlling the rate at which air leaves the cabin.

.	M01A	AMA
5..In the combustion heater, combustion air system, what prevents too much air from entering the heaters as air pressure increases?
A) Either a combustion air relief valve or a differential pressure regulator.
B) Only a differential pressure regulator can be used.
C) Only a combustion air relief valve can be used.

.	M01A	AMA
6..What is ventilating air used for on a combustion heater?
A) Provides combustion air for ground blower.
B) Carries heat to the places where needed.
C) Provides air required to support the flame.

.	M01A	AMA
7..At which component in an air cycle cooling system does air undergo a pressure and temperature drop?
A) Expansion turbine.
B) Primary heat exchanger.
C) Refrigeration bypass valve.

.	M01A	AMA
8..How often should standard weight high pressure oxygen cylinders be hydrostatically tested?
A) Every 5 years.
B) Every 4 years.
C) Every 3 years.

.	M01A	AMA
9…Turbine engine air used for air conditioning and pressurization is generally called
A) compressed air.
B) ram air.
C) bleed air.

10.	M01A	AMA
In an operating vapor cycle cooling system, if the two lines connected to the expansion valve are essentially the same temperature, what does this indicate?
A) The system is functioning normally.
B) The expansion valve is not metering freon properly.
C) The compressor is pumping too much refrigerant.

.	M0QA	AMA
11In the diluter demand oxygen regulator, when does the demand valve operate?
A) When the diluter control is set at normal.
B) When the user demands 100 percent oxygen.
C) When the user breathes.

.	M0QA	AMA
12..What controls the amount of oxygen delivered to a mask in a continuous flow oxygen system?
A) Calibrated orifice.
B) Pressure reducing valve.
C) Pilot's regulator.

47Q.	M0QA	AMA
13..If oxygen bottle pressure is allowed to drop below a specified minimum, it may cause
A) the pressure reducer to fail.
B) the automatic altitude control valve to open.
C) moisture to collect in the bottle.

.	M0QA	AMA
14When an aircraft's oxygen system has developed a leak, the lines and fittings should be
A) removed and replaced.
B) inspected using a special oxygen system dye penetrant.
C) bubble tested with a special soap solution manufactured specifically for this purpose.

.	M01A	AMA
15..What type of oil is suitable for use in vapor-cycle cooling system?
A) Low viscosity engine oil with the inability to absorb water.
B) Special high grade refrigeration oil.
C) Highly refined synthetic oil, free from impurities with special water absorbing additives.

.	M01A	AMA
16..When Refrigerant 12 is passed over an open flame, it
A) changes to methane gas.
B) is broken down into its basic chemical elements.
C) changes to phosgene gas.

.	M01A	AMA
17…What is the condition of the refrigerant as it enters the evaporator of a vapor cycle cooling system?
A) High pressure liquid.
B) Low pressure liquid.
C) High pressure vapor.

	M01A	AMA
18..The purpose of a subcooler in a vapor cycle cooling system is to
A) augment the cooling capacity during periods of peak demand.
B) aid in quick cooling a hot aircraft interior.
C) cool the freon to prevent premature vaporization.

.	M0QA	AMA
19..In a high-pressure oxygen system, if the pressure reducer fails, what prevents high pressure oxygen from entering the system downstream?
A) Check valve.
B) Pressure relief valve.
C) Manifold control valve.

.	M01A	AMA
20..When a vapor cycle cooling system is not in operation, what is an indication that the system is leaking freon?
A) Oil seepage.
B) Bubbles in the sight glass.
C) An ozone-like odor in the immediate area.

.	M01A	AMA
21..When purging a freon air conditioning system, it is important to release the charge at a slow rate. What is the reason for the slow rate discharge?
A) Prevent the large amount of freon from contaminating the surrounding atmosphere.
B) Prevent excessive loss of refrigerant oil.
C) Prevent condensation from forming and contaminating the system.

21) In straight and level flight

a) Thrust equal to drag and lift is equal to weight.

b) Thrust equal to weight and lift equal to drag.

22) mark the correct statement

a) Turbofan engines requires less runway than turbojet

23) The drawing often used in illustrated parts manual is

a) isometric projection

b) exploded view drawing.

24) in a/c lubrication pipelines can be identified by

a) Green

b) Brown and yellow

c) Yellow

25) In CRT, the primary colour used are

a) Red, green, blue

b) Yellow, orange, red

c) Green ,yellow, blue

26) Metal tubing’s can be measured by its

a) Outside dia in 16th of an inch

27) A/c bolts are manufactured in

a) Class 3 fit

28) A/c screws are manufactured in

a) Class 2 fit

29) Class 3 fit is

a)medium fit

30) The bolt which is used on shear load but not on tension

a) Clevis bolt

31)the nut which is

unaffected by immersion in hot or cold water or ordinary solvent

such as ether,ccl4,oils and gasoline and it will not damage bolt

threads or plating

a) Elastic stop nut

32) The torque wrench in which unlock the grip and adjust the

handle to desired torque is

a) micrometer setting type

33) For the repair of damaged internal threads which is used

a) helicoils and replacement bushings

34) Mark correct statement regarding control cable

a) Cable linkage has the disadvantage that tension must

be adjusted frequently due to stretching and temperature

changes.

35) In a turnbuckle, groove or knurl around that and of the barrel

is usually identified as

a) Left hand thread

36) which of the following is known as field rivet

a) 2117 T

37)Rivnut is a

a) Hollow blind rivet

38) Which of the following has the greatest advantage which can

be used in phosphate ester base hydraulic fluid?

a) Butyl

39) The corrosion attack along the grain boundaries of an alloy is

a) Intergranular corrosion

40) Aluminum combined with which of the following will create

most effective corrosion

a)copper

41) what is the amount of carbon added to iron so that the

product will become vastly superior to iron alone

a) Carbon is added approx 1%

42) Spark test is common for

a) Ferrous metal

b) Non ferrous metal

43) In five numeral designation of alloy steels according to sae

the 1st 2 digits indicates

a) Type of steel

b)alloying element

44) Aluminum alloy is used vastly in a/c due to

a) High strength to weight ratio

b) Ease of fabrication

c) Non magnetic and an excellent conductor

d) AOTA

45) In 3xxx th 1st number “3” shows which material

a) Manganese

46) Mark the correct statement for titanium alloys

a) used for compressor disks and space rings compressor blades

b) Fuselage skins, engine shrouds, firewall, longerons, frames

c) turbine housing liners and air ducts

d)AOTA

47) For aluminum alloys the heat treatments given are

a) SHT

b) PHT

c) annealing

d) AOTA

48) Hardness testing – mark the correct statement

a) Hardness testing is a method of determining the results of heat treatment.

49) Testing of copper, aluminum alloys are carried out by

a) Barcol tester

50) The property of a conductor of electricity that limits or

restricts the flow of electric current

a) Resistance

51) Which of the following resistor control relatively low current

a) carbon resistor

52) two resistor r1= 5 ohm. R2= 10ohm are series and a volt of

30 used the current is

a)2A

b)1A

c)3A

53) Which of the following is used as a switch?

a) transistor

54) In large a/c electricity can be get from

a)batteries only

b) Generators and APU

55) Purpose of commutator in a generator

a) Converts ac to dc

56) Pulse echo in UT can detect

a) Weld flaws

57) In eddy current method

a) metals can be detected

b) Non metals can be detected

c) Both

58) While storing the a/c in hanger

a) Fuel tanks should be filled

59) Portable hydraulic test unit can perform

a) Drain the a/c hydraulic system

b) Filter the a/c system hydraulic fluid

c) Can be used to perform all the system tests that fixed

shop[ test stands are designed to perform

d)AOTA

60)fires inflammable petroleum products or other flammables or

combustibles liquids is classified as

a) Class b fires

61)to secure large a/c the tie down is down by using

a)cables

62) Mark the correct statement

a) The standard position of a signal man is slightly ahead

of and in line with the aircraft left wing tip, as the

signalman faces the a/c ,the nose of the a/c is on his left

64) Materials used in manufacturing of wrenches and spanners

are

a) Chrome vanadium

65)Hacksaw blades are made of

a)high grade tool steel

66)the type of file which used for filing internal amgles clearing

out corners, l filing taps and cutters

a)triangular and three square files

67)which of the following frequency is used for space propagation

a)30MHZ and above

68)engines fires once in

a)two revolution of crankshaft

69) major composition of stainless steel

a) Chromium

70) Convert decimal 127 to binary

71)a base metal is mixed with other metal in a small amount is

called

a) Alloy

72) Mallet is a hammer like tool made of

a) Rubber, rawhide, hickory

73) The threads which run lengthwise of the fabric is called

a) Warp

74) the composite material which has high tensile strength is

a) aramid

75) in which type of battery the capacity is less affected when

discharging rapidly

a)secondary battery

b)re chargeable battery

c)ni-cd battery

d) lead acid battery

76)accuracy of micrometer can be checked by

a)gauge block

b) Machinist scale

c) Dti

77) In which basis the transmission of hydraulic force is done in

a)Charles law

b)boyles law

c)newtons law

d)pascals law

78)generator frequency depends upon

a) no of freq

b) Rpm

c) Both a &b

79) An aluminum bolt can be identified by

a) Two raised dash on the head

80) Mark the correct statement –jacking the aircraft

a) At least four jacking points are provided in a/c

b) Parking brake should be applied while jacking

c) The legs of brake should be checked to see that they

will not interfere with any of the control surface

d) AOTA

81) In correct sequence – 5 events of a piston engines

a) Intake, compression, ignition, power, exhausts

b)ignition ,thrust,power,intake,power

c) only b is correct

d) non is correct

82) SCR is

a) Three junction diode

b) Two junction forward bias and one junction reverse bias

c) Both

83 ) The transistor configuration is

a)CE

b)CB

c)CC

84 ) Mark the correct statement regarding critical angle or stall

angle

a) It is of maximum lift

b) It is of minimum lift

c) As in (a) airflow on the

d) As in (b) airflow on the

85) Drag which is caused by lift is

a) Parasite drag

b) profile drag

c) Induced drag

d) Both a & b

86) one coulombs equal to

 flexible hose is used in a/c plumbing for

a) Connecting moving parts with stationary parts in locations

subject to vibration.

87) Lift depends upon

88) Capacitor of 224 is

a) 224 pf

b) 224f

c) 224 micro f

89) PNPN in which p

a) Acceptor of electrons

b) Donor of electrons

c) n-acceptor of electrons

90) Regarding resonance of ac ckt

a) Xl is less than XC

b) Xc is greater than XL

c) Xl=XC

91) In steady flight and level flight how are the forces

a) Equal

b)less than weight

c)more than thrust

92) Transformer where Ns=200,Np=300,Vs=100,find Vp=?

a)150v

b)200v

c)100v

93
In what position should the bottle be placed when adding liquid freon to a vapor cycle cooling system?
A) Vertical with the outlet at the top.
B) Horizontal with the outlet to the side.
C) Vertical with the outlet at the bottom.

94
What is the condition of the refrigerant as it leaves the condenser of a vapor cycle cooling system?
A) Low pressure liquid.
B) High pressure liquid.
C) High pressure vapor.

95
What is the condition of the refrigerant as it leaves the evaporator of a vapor cycle cooling system?
A) Low pressure liquid.
B) Low pressure vapor.
C) High pressure vapor.

96
The evacuation of a vapor-cycle cooling system removes any water that may be present by
A) drawing out the liquid.
B) raising the boiling point of the water and drawing out the vapor.
C) lowering the boiling point of the water and drawing out the vapor.

97
(1) A small amount of water in a vapor cycle cooling system can freeze in the receiver-dryer and stop the entire system operation.
(Q) Water in a vapor cycle cooling system will react with refrigerant to form hydrochloric acid which is highly corrosive to the metal in the system.
Regarding the above statements,
A) only No. 1 is true.
B) only No. Q is true.
C) both No. 1 and No. Q are true.

98
Oxygen systems in unpressurized aircraft are generally of the
A) continuous flow and pressure demand types.
B) pressure demand type only.
C) portable bottle type only.

99
Which of the following are characteristic of a chemical or solid state oxygen system?
1. An adjustable oxygen release rate.
Q. A volume storage capacity about three times that of compressed oxygen.
3. The system generators are inert below 400 °F even under severe impact.
4. A distribution and regulating system similar to gaseous oxygen systems.
A) Q & 3.
B) 3 & 4.
C) 1 & Q.

100
How should you determine the amount of oxygen in a portable, high pressure cylinder?