Prime Movers
Aerospace Ground Equipment Journeyman
- 1.
(401) What provides contact between the stationary and rotating parts of a motor?
- A.
Field windings
- B.
Commutator
- C.
Bearings
- D.
Brushes
Correct Answer
D. Brushes -
- 2.
(401) What opposes the applied voltage in direct current (DC) motors?
- A.
Couter electromotive force (CEMF)
- B.
Output power
- C.
Horsepower
- D.
Torque
Correct Answer
A. Couter electromotive force (CEMF) -
- 3.
(402) In a series-wound direct current (DC) motor, speed is dependent on the
- A.
Load
- B.
Torque
- C.
Armature
- D.
Field winding
Correct Answer
A. Load -
- 4.
(402) In large universal motors, reactance losses are compensated for by
- A.
A reactance winding
- B.
An auxiliary winding
- C.
An auxiliary armature
- D.
A reactance compensator
Correct Answer
B. An auxiliary winding -
- 5.
(403) To operate a single-phase induction motor requires that it has
- A.
Brushes
- B.
Slip rings
- C.
A commutator
- D.
Starting system
Correct Answer
D. Starting system -
- 6.
(403) Which induction motor has the highest starting torque?
- A.
Capacitive-start
- B.
Squirrel-cage
- C.
Shaded-pole
- D.
Split-phase
Correct Answer
A. Capacitive-start -
- 7.
(404)The three-phase induction motor does not require
- A.
Slip
- B.
A rotor
- C.
A stator
- D.
A starting device
Correct Answer
D. A starting device -
- 8.
(404) To reverse the direction of rotation of a three-phase inductive motor, you must reverse
- A.
All three phases
- B.
Any two power leads
- C.
A and B phases only
- D.
B and C phases only
Correct Answer
B. Any two power leads -
- 9.
(405) The speed of a synchronous motor is controlled by the
- A.
Load
- B.
Torque
- C.
Input frequency
- D.
Armature current
Correct Answer
C. Input frequency -
- 10.
(406) During an inspection of a direct current (DC) motor, check the brushes for
- A.
Pitting
- B.
Seating
- C.
Coloration
- D.
Spring pressure
Correct Answer
B. Seating -
- 11.
(406) Which component is one of the major causes of failure in the direct current (DC) motor?
- A.
Commutator
- B.
Slip rings
- C.
Bearings
- D.
Rotor
Correct Answer
A. Commutator -
- 12.
(406) When you check the concentricity of a commutator or slip rings, look for
- A.
Wear
- B.
Pitting
- C.
Roundness
- D.
Overheating
Correct Answer
C. Roundness -
- 13.
(407) Which of the following is not listed in a troubleshooting chart?
- A.
Analysis
- B.
Remedies
- C.
Symptoms
- D.
Probable causes
Correct Answer
A. Analysis -
- 14.
(407) When you troubleshoot a motor, you should first perform a
- A.
Voltage check
- B.
Continuity test
- C.
Visual inspection
- D.
Current measurement
Correct Answer
C. Visual inspection -
- 15.
(407) You can do most troubleshooting on a motor by using a
- A.
Megger
- B.
Growler
- C.
Multimeter
- D.
Clamp-on ammeter
Correct Answer
C. Multimeter -
- 16.
(408) In component removal, if wires are to be soldered, do not
- A.
Cut tem, but remove the wiring intact
- B.
Resolder them until they have been bench checked
- C.
Resolder them until all wiring has been replaced with new wires
- D.
Cut them unless there is a sufficient length remaining for resoldering
Correct Answer
D. Cut them unless there is a sufficient length remaining for resoldering -
- 17.
(408) When you clean motors, the component most likely to be damaged by cleaning solvents is the
- A.
Brushes
- B.
Bearings
- C.
Slip rings
- D.
Commutator
Correct Answer
A. Brushes -
- 18.
(408) Perform a operational check of the unit
- A.
At the last minute
- B.
With the defective part removed
- C.
Before final reassembly of the enclosure
- D.
As soon as you replace the defective part
Correct Answer
C. Before final reassembly of the enclosure -
- 19.
(409) What kind of pumps are injection pumps also called?
- A.
Control
- B.
Metering
- C.
Pressure
- D.
Mechanical
Correct Answer
B. Metering -
- 20.
(409) What is used on the constant-stroke pump plunger to determine the amount of fuel that is delivered?
- A.
Bypass port
- B.
Vertical slot
- C.
Helical groove
- D.
Delivery valve
Correct Answer
C. Helical groove -
- 21.
(409) What controls the amount of fuel injected when constant-stroke fuel injection pumps are used?
- A.
Injector
- B.
Control rack
- C.
Delivery valve
- D.
Revolving disk
Correct Answer
B. Control rack -
- 22.
(410) When a lubricant reduces friction, it also reduces
- A.
Heat
- B.
Wear
- C.
Resistance
- D.
All of the above
Correct Answer
D. All of the above -
- 23.
(410) Which function does a lubricant perform by constantly circulating past the air that surrounds the oil sump?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
Correct Answer
A. Cooling -
- 24.
(410) A lubricant performs which function when it deposits particles of dirt in the oil sump?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
Correct Answer
C. Cleaning -
- 25.
(410) Which of the four functions of a lubricant compensates for tiny scratches in the cylinder wall?
- A.
Cooling
- B.
Sealing
- C.
Cleaning
- D.
Reducing friction
Correct Answer
B. Sealing -
- 26.
(411) What component holds a large amount of coolant in close contact with a large volume of air?
- A.
Radiator cap
- B.
Thermostat
- C.
Water pump
- D.
Radiator
Correct Answer
D. Radiator -
- 27.
(411) Which liquid cooling system component maintains positive pressure within the cooling system, causes the boiling point of the coolant to be higher, and permits the engine to operate at higher temperature without the coolant boiling?
- A.
Thermostat
- B.
Water pump
- C.
Radiator cap
- D.
Vacuum valve
Correct Answer
C. Radiator cap -
- 28.
(411) Which liquid cooling system component circulates the coolant?
- A.
Radiator
- B.
Water pump
- C.
Cooling fan
- D.
Vacuum valve
Correct Answer
B. Water pump -
- 29.
(411) The purpose of the cooling syestem thermostat is to maintain correct engine
- A.
Operating temperature
- B.
Coolant temperature
- C.
System pressure
- D.
Coolant flow
Correct Answer
B. Coolant temperature -
- 30.
(412) A blower on a diesel engine is normally driven
- A.
By the engine electrical system through a DC motor
- B.
By the engine exhaust gases flowing across the turbine wheel
- C.
From the engine crankshaft through a system of gears or chains
- D.
Through a solid shaft connected between the blower and transmission
Correct Answer
C. From the engine crankshaft through a system of gears or chains -
- 31.
(412) What is the advantage of using a turbocharger on a diesel engine?
- A.
Fuel consumption is increased and the horsepower rating of the engine is decreased
- B.
Fuel consumption is increased because of the better mixing of the fuel with the air charge.
- C.
Fuel consumption is decreased because of the increased internal operating temperature of the engine
- D.
Fuel is burned more efficiently and horsepower is increased
Correct Answer
D. Fuel is burned more efficiently and horsepower is increased -
- 32.
(413) The maintenance procedure that is considered to be the cheapest and most effective means of reducing equipment problems and maintenance cost is
- A.
Correct defective components only
- B.
Rigid maintenance schedules
- C.
Periodic overhaul schedule
- D.
Preventive maintenance
Correct Answer
D. Preventive maintenance -
- 33.
(413) You should protect diesel engine fuel systems from
- A.
Blockage of airflow
- B.
Lube system malfunctions
- C.
Slipping belts on the blower
- D.
Abrasion by foreign particles
Correct Answer
D. Abrasion by foreign particles -
- 34.
(414) To prevent abnormal amounts of carbon, moisture, and sludge build-up in a diesel engine,
- A.
Avoid operation the engine for extended periods at no-load
- B.
Operate the unit at idle speed for long periods of time
- C.
Drain moisture from fuel system periodically
- D.
Perform a preoperational check
Correct Answer
A. Avoid operation the engine for extended periods at no-load -
- 35.
(415) What is the allowable deviation between cylinders during a compression test?
- A.
25 psi
- B.
50 psi
- C.
75 psi
- D.
100 psi
Correct Answer
A. 25 psi -
- 36.
(415) When you remove an engine from a unit, what steps should you take to prevent a fire hazard when you disconnect fuel lines?
- A.
Mark all wiring
- B.
Disconnect the intake air duct
- C.
Keep several rags near the unit for spill clean-up
- D.
Disconnect the battery and close the fuel shutoff valve
Correct Answer
D. Disconnect the battery and close the fuel shutoff valve -
- 37.
(416) What is the key to purification of used coolant?
- A.
The removal of water from the coolant
- B.
The removal of total dissolved solids
- C.
The production of clean, drinkable water
- D.
The production of impurities in the coolant mixture
Correct Answer
B. The removal of total dissolved solids -
- 38.
(417) What is used on the turbine engine to reduce engine speed for the operation of accessory components?
- A.
Gearcase
- B.
Starter motor
- C.
Tachometer generator
- D.
Multiple centrifugal switch assembly
Correct Answer
A. Gearcase -
- 39.
(417) The cooling fan in the gas turbine engine provides cooling air for the
- A.
Starter motor
- B.
Transformer retifier
- C.
Fuel pump and control unit
- D.
Multiple centrifugal switch assembly
Correct Answer
B. Transformer retifier -
- 40.
(418) In the gas turbine engine, the air is accelerated by the
- A.
Impellers
- B.
Diffusers
- C.
Exducers
- D.
Deswirl ring
Correct Answer
A. Impellers -
- 41.
(418) The component of the gas turbine engine that changes the velocity of the air to pressure is the
- A.
Nozzle ring
- B.
Turbine wheel
- C.
Torus assembly
- D.
Divergent diffuser
Correct Answer
D. Divergent diffuser -
- 42.
(418) In the turbine engine, fuel and air are mixed and the fuel is ignited in the
- A.
Fuel atomizer
- B.
Plenum chamber
- C.
Mixer assembly
- D.
Combustor can
Correct Answer
D. Combustor can -
- 43.
(418) The component to the gas turbine engine that extracts energy from the burning gases is the
- A.
Inducer
- B.
Diffuser
- C.
Turbine wheel
- D.
Torque converter
Correct Answer
C. Turbine wheel -
- 44.
(419) The purpose of the boost pump on the gas turbine engine is to provide fuel to the
- A.
Fuel atomizer
- B.
Main fuel pump
- C.
Combustion chamber
- D.
Fuel air mixture valve
Correct Answer
B. Main fuel pump -
- 45.
(419) The two pressure controls in the fuel pump and control unit of the turbine engine are the
- A.
Governor and pneumatic control device
- B.
Acceleration limiter valve and governor
- C.
Fuel solenoid valve and pneumatic control device
- D.
Acceleration limiter valve and fuel solenoid valve
Correct Answer
B. Acceleration limiter valve and governor -
- 46.
(419) In the gas turbine compressor (GTC), the engine's constant speed is maintained by the
- A.
Governor
- B.
Fuel regulator
- C.
Acceleration limiter valve
- D.
Acceleration stabilizer solenoid
Correct Answer
A. Governor -
- 47.
(419) Which gas turbine compressor (GTC) systems control the fuel solenoid for the delivery of fuel to the atomizer?
- A.
Lubrication and electrical
- B.
Lubrication and cooling
- C.
Air and lubrication
- D.
Air and electrical
Correct Answer
A. Lubrication and electrical -
- 48.
(419) Which turbine engine fuel system component is normally closed and is energized open when the engine builds up sufficient oil?
- A.
Governor
- B.
Boost pump
- C.
Oil shutoff valve
- D.
Fuel shutoff solenoid valve
Correct Answer
D. Fuel shutoff solenoid valve -
- 49.
(419) Which turbine engine fuel system component prevents fuel from accumulating in the plenum?
- A.
Atomizer
- B.
Drain valve
- C.
Pneumatic control device
- D.
Acceleration limiter valve
Correct Answer
B. Drain valve -
- 50.
(421) Pressure in the lubrication system of the turbine engine is regulated by the oil
- A.
Flow check valve
- B.
Filter bypass valve
- C.
Pressure relief valve
- D.
Temperature regulator
Correct Answer
C. Pressure relief valve -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Jan 08, 2013Quiz Edited by
ProProfs Editorial Team -
Nov 06, 2009Quiz Created by
Jammen.douglas
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