Prime Movers

65 Questions | By Jammen.douglas | Last updated: Jan 8, 2013 | Total Attempts: 131

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Questions and Answers

1.

(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
2.

(401) What opposes the applied voltage in direct current (DC) motors?
- A.
  
  Couter electromotive force (CEMF)
- B.
  
  Output power
- C.
  
  Horsepower
- D.
  
  Torque
3.

(403) To operate a single-phase induction motor requires that it has
- A.
  
  Brushes
- B.
  
  Slip rings
- C.
  
  A commutator
- D.
  
  Starting system
4.

(404)The three-phase induction motor does not require
- A.
  
  Slip
- B.
  
  A rotor
- C.
  
  A stator
- D.
  
  A starting device
5.

(401) What provides contact between the stationary and rotating parts of a motor?
- A.
  
  Field windings
- B.
  
  Commutator
- C.
  
  Bearings
- D.
  
  Brushes
6.

(406) During an inspection of a direct current (DC) motor, check the brushes for
- A.
  
  Pitting
- B.
  
  Seating
- C.
  
  Coloration
- D.
  
  Spring pressure
7.

(403) Which induction motor has the highest starting torque?
- A.
  
  Capacitive-start
- B.
  
  Squirrel-cage
- C.
  
  Shaded-pole
- D.
  
  Split-phase
8.

(405) The speed of a synchronous motor is controlled by the
- A.
  
  Load
- B.
  
  Torque
- C.
  
  Input frequency
- D.
  
  Armature current
9.

(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
10.

(402) In a series-wound direct current (DC) motor, speed is dependent on the
- A.
  
  Load
- B.
  
  Torque
- C.
  
  Armature
- D.
  
  Field winding
11.

(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
12.

(406) When you check the concentricity of a commutator or slip rings, look for
- A.
  
  Wear
- B.
  
  Pitting
- C.
  
  Roundness
- D.
  
  Overheating
13.

(407) Which of the following is not listed in a troubleshooting chart?
- A.
  
  Analysis
- B.
  
  Remedies
- C.
  
  Symptoms
- D.
  
  Probable causes
14.

(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
15.

(407) When you troubleshoot a motor, you should first perform a
- A.
  
  Voltage check
- B.
  
  Continuity test
- C.
  
  Visual inspection
- D.
  
  Current measurement
16.

(407) You can do most troubleshooting on a motor by using a
- A.
  
  Megger
- B.
  
  Growler
- C.
  
  Multimeter
- D.
  
  Clamp-on ammeter
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
18.

(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
19.

(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
20.

(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
21.

(409) What kind of pumps are injection pumps also called?
- A.
  
  Control
- B.
  
  Metering
- C.
  
  Pressure
- D.
  
  Mechanical
22.

(415) What is the allowable deviation between cylinders during a compression test?
- A.
  
  25 psi
- B.
  
  50 psi
- C.
  
  75 psi
- D.
  
  100 psi
23.

(410) When a lubricant reduces friction, it also reduces
- A.
  
  Heat
- B.
  
  Wear
- C.
  
  Resistance
- D.
  
  All of the above
24.

(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
25.

(424) Common or frequently occurring troubles in a unit, their causes, and remedies may be found in the
- A.
  
  Historical record
- B.
  
  Maintenance record
- C.
  
  Troubleshooting chart
- D.
  
  Illustrated parts breakdown
26.

(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
27.

(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
28.

(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
29.

(411) Which liquid cooling system component circulates the coolant?
- A.
  
  Radiator
- B.
  
  Water pump
- C.
  
  Cooling fan
- D.
  
  Vacuum valve
30.

(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
31.

(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
32.

(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
33.

(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
34.

(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
35.

(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
36.

(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
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
38.

(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
39.

(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
40.

(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
41.

(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
42.

(418) In the gas turbine engine, the air is accelerated by the
- A.
  
  Impellers
- B.
  
  Diffusers
- C.
  
  Exducers
- D.
  
  Deswirl ring
43.

(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
44.

(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
45.

(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
46.

(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
47.

(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
48.

(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
49.

(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
50.

(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
51.

(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
52.

(420) In the gas turbine compressor (GTC), engine operation with insufficient oil pressure is prevented by the
- A.
  
  Oil pressure solenoid
- B.
  
  Oil pressure switch
- C.
  
  Oil drain switch
- D.
  
  Ignition coil
53.

(421) In the gas turbine compressor (GTC), the supply of high volume, low pressure air to the aircraft is controlled by the
- A.
  
  Bleed air system
- B.
  
  Airflow regulator
- C.
  
  Electrical system
- D.
  
  Pressure regulator
54.

(421) The load section of the load control valve consist of
- A.
  
  Chambers 1 and 2
- B.
  
  Chambers 2 and 3
- C.
  
  Chambers 3 and 4
- D.
  
  Chambers 1 and 4
55.

(421) The time required to open the load control valve on the turbine engine is controlled by the
- A.
  
  Actuator diaphragm
- B.
  
  Mechanical linkage
- C.
  
  Rate adjustment screw
- D.
  
  Actuator return spring
56.

(421) If the gas turbine compressor (GTC) load control valve opened too slowly or snapped open, what is the most probable cause of malfunction?
- A.
  
  Excessive exhaust gas temperature
- B.
  
  Maladjusted rate adjustment screw
- C.
  
  Ruptured actuator diaphragm
- D.
  
  Defective relief valve
57.

(426) In the gas turbine compressor (GTC) load control valve (assume the electrical system is okay), what component would most probably be at fault if the valve failed to open?
- A.
  
  Relief valve
- B.
  
  Actuator diaphragm
- C.
  
  Rate adjustment screw
- D.
  
  Rate control diaphragm
58.

(422) During a preoperational inspection of a gas turbine engine, you check the intake and exhaust for
- A.
  
  Leakage
- B.
  
  Excess heat
- C.
  
  Hairline cracks
- D.
  
  Foreign objects
59.

(425) What causes gray or white smoke to pour from the exhaust stack on the gas turbine compressor?
- A.
  
  Excessive engine RPM
- B.
  
  Fuel mixing with the airflow
- C.
  
  Oil that enters the airflow system
- D.
  
  Excessive engine exhaust temperature
60.

(425) While troubleshooting the gas turbine compressor (GTC), you find no oil pressure and te oil filter is dirty. Will changing the filter correct the problem?
- A.
  
  Yes, the filter blocked oil flow.
- B.
  
  No, the filter bypass valve is stuck open.
- C.
  
  No, the oil pressure relief valve is stuck open.
- D.
  
  No, the scavenge pump is not providing sufficient suction.
61.

(425) In the gas turbine compressor (GTC), if large amounts of oil are vented overboard during shutdown, the most probable cause is defective
- A.
  
  Main oil pump
- B.
  
  Scavenge pump
- C.
  
  Oil tank vent line
- D.
  
  Oil drain solenoid
62.

(423) Before you load and after you unload the gas turbine compressor (GTC), allow the engine to operate unloaded to
- A.
  
  Decrease noise
- B.
  
  Allow for flameouts
- C.
  
  Reduce thermal stress
- D.
  
  Allow for positioning of the service hose
63.

(423) When you operate a gas turbine engine, you should
- A.
  
  Use earplugs and muffs
- B.
  
  Never enter the plane of rotation
- C.
  
  Stay away from the rear of the engine
- D.
  
  All of the above
64.

(423) Normal acceleration characteristics of the gas turbine compressor (GTC) include
- A.
  
  A decrease in vibration after 35 percent
- B.
  
  Sudden rumbling noises after 35 percent
- C.
  
  Smooth and quiet acceleration
- D.
  
  Burping
65.

(426) What could cause the butterfly valve to oscillate (continually open and close)?
- A.
  
  Load valve
- B.
  
  Hose relief valve
- C.
  
  Pneumatic thermostat
- D.
  
  Rate adjustment screw

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