2A652 Volume 3 CDC Pretest

85 Questions | By Jnjnils | Updated: Mar 20, 2022 | Attempts: 1554

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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