2A652 Volume 3 CDC Pretest
- 1.After shutdown a motor continues turning; this is known as
- A.
Inertia
- B.
Impedance
- C.
Inductance
- D.
Eddy currents
- 2.Torque is defined as
- A.
Horsepower
- B.
Wattage
- C.
Rotational force
- D.
Opposition to applied voltage
- 3.In a series-wound DC motor, speed is controlled by the
- A.
Load
- B.
Torque
- C.
Armature
- D.
Field winding
- 4.Which induction motor has the highest starting torque?
- A.
Capacitive-start
- B.
Squirrel cage
- C.
Shaded pole
- D.
Split-phase
- 5.The three-phase induction motor does not require
- A.
Slip
- B.
A totor
- C.
A stator
- D.
A starting device
- 6.One advantage of the three-phase induction motor over a comparable single-phase unit is
- A.
Lower voltage requirement
- B.
High starting torque
- C.
A higher speed
- D.
Less weight
- 7.The stator windings of a synchronous motor are wound
- A.
20 degrees apart
- B.
30 degrees apart
- C.
90 degrees apart
- D.
120 degrees apart
- 8.Which component is one of the major causes of failure in the DC motor?
- A.
Commutator
- B.
Slip rings
- C.
Bearings
- D.
Rotor
- 9.When you check the concentricity of a commutator or slip rings, look for
- A.
Wear
- B.
Pitting
- C.
Roundness
- D.
Overheating
- 10.When using a troubleshooting chart, what are you not likely to find?
- A.
Analysys
- B.
Remedies
- C.
Symptoms
- D.
Probable causes
- 11.The first thing you should do when troubleshooting a motor is a
- A.
Voltage check
- B.
Continuity test
- C.
Visual inspection
- D.
Current measurement
- 12.The component most likely to be damaged by cleaning solvent is the
- A.
Brushes
- B.
Bearings
- C.
Slip rings
- D.
Commutator
- 13.The type of injector that is operated by a rocker arm is the
- A.
Spray
- B.
Pintle
- C.
Pressure
- D.
Mechanical
- 14.When a lubricant reduces friction, it also reduces
- A.
Heat
- B.
Wear
- C.
Resistance
- D.
All of the above
- 15.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
- 16.Which 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
- 17.The purpose of the cooling system thermostat is to maintain correct engine
- A.
Operating temperature
- B.
Coolant temperature
- C.
System pressure
- D.
Coolant flow
- 18.What is installed on a two stroke diesel engine to ensure displacement of all exhaust gases?
- A.
Blower
- B.
Intake valve
- C.
Exhaust valve
- D.
Turbulence chamber
- 19.The maintenance procedure that is considered to be the cheapest and most effective means of reducing injection equipment problems and maintenance costs is
- A.
Correct defective components only
- B.
Rigid maintenance schedules
- C.
Periodic overhaul schedule
- D.
Preventive maintenance
- 20.The filtration step protects the diesel engine fuel system from
- A.
Blockage of airflow
- B.
Lube system malfunctions
- C.
Slipping belts on the blower
- D.
Abrasion by foreign particles
- 21.The best step in preventing abnormal amounts of carbon, mositure, and sludge bulid-up in a diesel engine, is to
- A.
Avoid operating the engine for extended periods at no-load
- B.
Operate the unit a idle speed for ling periods of time
- C.
Drain moisture from fuel system periodically
- D.
Perform a preoperation check
- 22.When performing a compression test the allowable deviation between cylinders is
- A.
25 psi
- B.
50 psi
- C.
75 psi
- D.
100 psi
- 23.During starting, the turbine engine is rotated up to 20 percent by the
- A.
AC generator
- B.
Starter motor
- C.
Tachometer generator
- D.
Fuel pump and control unit
- 24.In the gas turbine engine, cooling air for the transformer rectifier is provided by the
- A.
Starter motor
- B.
Cooling fan
- C.
Fuel pump and control unit
- D.
Multiple centrifugal switch assembly
- 25.During gas turbine engine operation, the air is accelerated by the
- A.
Impellers
- B.
Diffusers
- C.
Exducers
- D.
Deswirl ring
Questions: 85 | Attempts: 4199 | Last updated: Jan 7, 2013
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