Which of the following causes of aircraft magnetic compass inaccuracies may be compensated for by mechanics?
Deviation. Magnetic compass current. Variation.
Aluminum wire must be stripped very carefully because:
high resistance will develop in stripping nicks. stripping nicks can cause short circuits. individual strands will break easily after being nicked.
The pole pieces or shoes used in a dc generator are a part of the:
armature assembly. field assembly. brush assembly.
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?
The system is functioning normally. The expansion valve is not metering freon properly. The compressor is pumping too much refrigerant.
When an air/oil type of landing gear shock strut is used, the initial shock of landing is cushioned by
compression of the air charge. the fluid being forced through a metered opening. compression of the fluid.
The method of mounting aircraft instruments in their respective panels depends on the
instrument manufacturer. design of the instrument case. design of the instrument panel.
If fluid is added to a reservoir in a constant pressure hydraulic system while the system is pressurized, what will result?
Fluid will spray violently out of the reservoir when the filler neck cap is removed. The fluid level will increase when system pressure is reduced. Air will be drawn into the system, when the filler neck cap is removed.
Which of the following may be used for the repair of fuel leaks on most integral fuel tanks?
Welding and resealing. Brazing and resealing. Riveting and resealing.
What is used in many aircraft to prevent bubbles in the fuel after it leaves the tank when atmospheric pressure is lower than fuel vapor pressure?
Air-fuel separators. Anti-foaming additives. Boost pumps.
The pin section of an AN/MS connector is normally installed on:
the power supply side of a circuit. the ground side of a circuit. either side of a circuit (makes no difference).
A sleeve, spacer, or bumper ring is incorporated in a landing gear oleo shock strut to:
limit the extension of the torque arm. limit the extension stroke. reduce the rebound effect.
Which is a characteristic of petroleum base hydraulic fluid?
Flammable under normal conditions. Compatible to natural rubber seals and packings. Nonflammable under all conditions.
What device in a hydraulic system with a constant-delivery pump allows circulation of the fluid when no demands are on the system?
Pressure relief valve. Shuttle valve. Pressure regulator.
Where electric cables must pass through holes in bulkheads, formers, ribs, firewalls, etc., the wires should be protected from chafing by: wrapping with plastic using a suitable grommet wrapping with electrical tape.
The pressure source for power brakes is: the main hydraulic system a master cylinder the power brake reservoir.
In an autopilot, which signal nullifies the input signal to the ailerons? followup signal course signal displacement signal.
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? the flap selector valve has a severe internal leak the pressure accumulator is not supplying pressure to the system the fluid level in the reservoir is low.
The purpose of a relief valve in a brake system is to:
reduce pressure for brake application. prevent the tire from skidding. compensate for thermal expansion.
Which of the following is most likely to cause thermal runaway in a nickel-cadmium battery?
A high internal resistance condition. Excessive current draw from the battery. Constant current charging of the battery to more than 100 percent of its capacity.
When using the voltage drop method of checking circuit resistance, the:
input voltage must be maintained at a constant value. output voltage must be maintained at a constant value. input voltage must be varied.
What should be used to melt the ice in a turbine engine if the compressor is immobile because of ice?
Deicing fluid. Anti-icing fluid. Hot air.
Overinflated aircraft tires may cause damage to the:
brake linings. wheel hub. wheel flange.
If control cables are adjusted properly and the control surfaces tend to vibrate, the probable cause is:
worn attachment fittings. oil can effects on the control surfaces. excessive cable tension.
Laminated wood is sometimes used in the construction of highly stressed aircraft components. This wood can be identified by its:
parallel grain construction. similarity to standard plywood construction. perpendicular grain construction.
How many of the following are benefits of using micro-Balloons when making repairs to laminated honeycomb panels? 1. Greater concentrations of resin in edges and corners. 2. Improved strength to weight ratio. 3. Less density. 4. Lower stress concentrations.
Four. Three. Two.
What type of valve is used in the brake actuating line to isolate the emergency brake system from the normal power brake control valve system?
A bypass valve. An orifice check valve. A shuttle valve.
What is the purpose of a mixing valve in a compressor bleed air air-conditioning system?
Control the supply of hot, cool, and cold air. Distribute conditioned air evenly to all parts of the cabin. Combine ram air with conditioned air.
(1) A dc selsyn system is a widely used electrical method of indicating a remote mechanical movement or position.
(2) A synchro type indicating system is an electrical system used for transmitting information from one point to another.
Regarding the above statements,
only No. 1 is true. only No. 2 is true. both No. 1 and No. 2 are true.
Which type of coating typically includes phosphoric acid as one of its components at the time of application?
Wash primer. Epoxy primer. Zinc chromate primer.
A fully integrated autopilot controls the aircraft around how many axes?
Two. Three. Four.
Some electric motors have two sets of field windings wound in opposite directions so that the:
speed of the motor can be more closely controlled. power output of the motor can be more closely controlled. motor can be operated in either direction.
Why is the main fuel strainer located at the lowest point in the fuel system?
It traps any small amount of water that may be present in the fuel system. It provides a drain for residual fuel. It filters and traps all micro-organisms that may be present in the fuel system.
The removal, installation, and repair of landing gear tires by the holder of a private pilot certificate on an aircraft owned or operated is considered to be:
a violation of the Federal Aviation Regulations. a minor repair. preventive maintenance.
What may be used to clean deicer boots?
Unleaded gasoline or Jet A fuel. Naphtha. Soap and water.
A probe or a series of probes is used in what kind of fuel quantity indicating system?
Selsyn. Capacitor. Synchro.
The identifying marks on the heads of aluminum alloy rivets indicate the:
degree of dimensional and process control observed during manufacture. head shape, shank size, material used, and specifications adhered to during manufacture. specific alloy used in the manufacture of the rivets.
Aluminum-pigment in dope is used primarily to:
provide a silver color. aid in sealing out moisture from the fabric. exclude sunlight from the fabric.
A decrease in pitch angle of the tail rotor blades on a helicopter:
causes the tail to pivot in the opposite direction of torque rotation around the main rotor axis. causes the tail to pivot in the direction of torque rotation around the main rotor axis. is required to counteract main rotor torque produced by takeoff RPM.
What precautions must be observed if a gravityfeed fuel system is permitted to supply fuel to an engine from more than one tank at a time?
The tank airspaces must be interconnected. The fuel outlet ports of each tank must have the same cross-sectional area. Each tank must have a valve in its outlet that automatically shuts off the line when the tank is empty.
What is the purpose of the distributor valve in a deicing system utilizing deicer boots?
To equalize the air pressure to the left and right wings. To sequence the deicer boots inflations symmetrically. To distribute anti-icing fluid to the deicer boots.
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