2A652 (Age Journeyman) Volume 3, Edit Code 6

123 Questions | Total Attempts: 827

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2A652 (Age Journeyman) Volume 3, Edit Code 6

2A652 vol 3 Ed. 6


Questions and Answers
  • 1. 
    (401) To change electrical energy to mechanical energy is the purpose of a
    • A. 

      Generator.

    • B. 

      Converter.

    • C. 

      Inverter.

    • D. 

      Motor.

  • 2. 
    (401) When a motor continues turning after reaching its limit, this is known as
    • A. 

      Inertia.

    • B. 

      Impedance.

    • C. 

      Inductance.

    • D. 

      Eddy currents.

  • 3. 
    (402) Torque is defined as
    • A. 

      Wattage.

    • B. 

      Horsepower.

    • C. 

      Rotational force.

    • D. 

      Opposition to applied voltage.

  • 4. 
    (403) In order to operate, a single-phase induction motor requires
    • A. 

      Brushes.

    • B. 

      Slip rings.

    • C. 

      A commutator.

    • D. 

      A starting system.

  • 5. 
    (403) The difference in the rotor’s speed of rotation and the stator magnetic field is known as
    • A. 

      Differential.

    • B. 

      Torque.

    • C. 

      Slip.

    • D. 

      Drag.

  • 6. 
    (403) Which induction motor has the highest starting torque?
    • A. 

      Capacitive start.

    • B. 

      Squirrel cage.

    • C. 

      Shaded pole.

    • D. 

      Split phase

  • 7. 
    (404) The three-phase induction motor does not require
    • A. 

      Slip.

    • B. 

      A rotor.

    • C. 

      A stator.

    • D. 

      A starting device.

  • 8. 
    (405) The stator windings of a synchronous motor are spaced
    • A. 

      20 degrees apart.

    • B. 

      30 degrees apart.

    • C. 

      90 degrees apart.

    • D. 

      120 degrees apart.

  • 9. 
    (406) During an inspection of a direct current (DC) motor, check the brushes for
    • A. 

      Pitting.

    • B. 

      Seating.

    • C. 

      Coloration.

    • D. 

      Brittleness.

  • 10. 
    (407) The first thing you should do when troubleshooting a motor is perform a
    • A. 

      Voltage check.

    • B. 

      Continuity test.

    • C. 

      Visual inspection.

    • D. 

      Current measurement.

  • 11. 
    (408) In component removal, if wires are to be soldered, do not
    • A. 

      Resolder them until they have been bench checked.

    • B. 

      Cut them, but remove the wiring completely intact.

    • C. 

      Resolder them until all wiring has been replaced with new wires.

    • D. 

      Cut them unless there is sufficient length remaining for resoldering.

  • 12. 
    (408) Perform an 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.

  • 13. 
    (409) What controls the amount of fuel injected when constant-stroke fuel injection pumps are used?
    • A. 

      Injectors.

    • B. 

      Control rack.

    • C. 

      Delivery valve.

    • D. 

      Revolving disk.

  • 14. 
    (409) The constant-stroke pump plunger determines the amount of fuel delivered by the position of a
    • A. 

      Bypass port.

    • B. 

      Vertical slot.

    • C. 

      Helical groove.

    • D. 

      Delivery valve.

  • 15. 
    (409) What provides the pressure to operate a pressure injector?
    • A. 

      Fuel from the fuel system.

    • B. 

      Air from the induction system.

    • C. 

      Water from the cooling system.

    • D. 

      Oil from the lubricating system.

  • 16. 
    (409) Aside from idle speed, the limiting speed governor through the use of flyweights and spring tension controls
    • A. 

      Load speed.

    • B. 

      Minimum speed.

    • C. 

      Maximum speed.

    • D. 

      Intermediate speed.

  • 17. 
    (410) What is also reduced when a lubricant reduces friction?
    • A. 

      Dirt and metal particles.

    • B. 

      Heat, wear, and resistance.

    • C. 

      Blow-by and loss of power.

    • D. 

      Dilution and increases cohesion.

  • 18. 
    (410) Which function of a lubricant compensates for microscopic irregularities in the cylinder wall?
    • A. 

      Cooling.

    • B. 

      Sealing.

    • C. 

      Cleaning.

    • D. 

      Reducing friction.

  • 19. 
    (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.

  • 20. 
    (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.

  • 21. 
    (411) The purpose of the cooling system thermostat is to maintain correct engine
    • A. 

      Operating temperature.

    • B. 

      Coolant temperature.

    • C. 

      System pressure.

    • D. 

      Coolant flow.

  • 22. 
    (412) What must be accomplished to supercharge a diesel engine?
    • A. 

      Change the overlap and timing so that the intake and exhaust valves are not open at the same time.

    • B. 

      Change the overlap and timing so that the intake and exhaust valves are open at the same time.

    • C. 

      Advance exhaust valve opening time.

    • D. 

      Retard intake valve opening time.

  • 23. 
    (412) The advantage of using a turbocharger on a diesel engine is the fuel consumption is
    • A. 

      Decreased because of the increased internal operating temperature of the engine.

    • B. 

      Increased because of the better mixing of the fuel with the air charge.

    • C. 

      Used more efficiently and horsepower is increased.

    • D. 

      Used more efficiently and horsepower is decreased.

  • 24. 
    (413) 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.

  • 25. 
    (413) 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.