3e151: Electrical Safety Hardest Trivia Questions! Quiz

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  • 1/64 Questions

    You use your volt-ohm-milliammeter to check a transformer. You find it has an open. In this situation, the probable cause is...

    • No control voltage.
    • A burned transformer.
    • No power to the G terminal.
    • A wire burned off the compressor.
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About This Quiz

Are you a student taking up a course on electricity, how to connect it and use it effectively? Are you looking for a way to test out just how much you have understood so far? Then what better way than to take these 3e151: Electrical Safety Hardest Trivia Questions from your coursework? Do give them a try and keep testing yourself!

3e151: Electrical Safety Hardest Trivia Questions! Quiz - Quiz

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  • 2. 

    You should never use hand tools in a...

    • Hot electrical panel.

    • Cold electrical panel.

    • Cold package air conditioner.

    • Hot package air conditioner.

    Correct Answer
    A. Hot electrical panel.
  • 3. 

    Which fan circuit contacts must be closed to pass power to the fan motor?

    • Fan relay

    • Fan speed relay

    • Evaporator relay

    • Condenser relay

    Correct Answer
    A. Fan relay
  • 4. 

    After you have disabled a motor disconnect, you lock and tag the panel. After this, you should be sure to keep the only key.

    • At the shop.

    • On your person.

    • With your crew leader.

    • With your shop supervisor.

    Correct Answer
    A. On your person.
  • 5. 

    If the motor drive pulley and the driven pulley are out of line, strain will be imposed on the...

    • Starting circuit.

    • Frame mounts.

    • Motor air system.

    • Shafts' drive mechanism.

    Correct Answer
    A. Shafts' drive mechanism.
  • 6. 

    When a partial restriction occurs in the liquid line, the point of the restriction will act like...

    • An evaporator.

    • A condenser.

    • A compressor.

    • An expansion device.

    Correct Answer
    A. An expansion device.
  • 7. 

    To safely check an electrical component for continuity or resistance, you would turn...

    • On the power and disconnect at least one lead from the meter.

    • Off the power and disconnect at least one lead from the meter.

    • On the power and disconnect at least one lead from the component.

    • Off the power and disconnect at least one lead from the component.

    Correct Answer
    A. Off the power and disconnect at least one lead from the component.
  • 8. 

    Which thermostat terminal passes power to the heat relay?

    • R

    • G

    • W

    • Y

    Correct Answer
    A. W
  • 9. 

    Most manufacturers illustrate the wiring in their equipment through the use of...

    • Pictorial and line diagrams.

    • Line and sectional diagrams.

    • Sectional and pictorial diagrams.

    • Sectional and enhanced diagrams.

    Correct Answer
    A. Pictorial and line diagrams.
  • 10. 

    You turn the indoor fan switch on a thermostat to the FAN ON position. When you do, the indoor fan motor does not come on. A possible cause of the problem is that there is...

    • Control voltage.

    • No control voltage.

    • Too much control voltage.

    • Not enough control voltage.

    Correct Answer
    A. No control voltage.
  • 11. 

    On a trouble call, you determine that voltage is present from R to Y at the thermostat but no voltage is present at the condenser contactor. In this situation, you would suspect that the...

    • R wire is broken.

    • Contacts are broken.

    • Y wire is broken.

    • R and Y wires are both broken.

    Correct Answer
    A. Y wire is broken.
  • 12. 

    Mechanical motor problems normally occur at the...

    • Pulley or belt drive.

    • Bearings or the shaft.

    • Pulleys or the shafts.

    • End bells or ball bearings.

    Correct Answer
    A. Bearings or the shaft.
  • 13. 

    Most assemblies are held on the motor shaft by...

    • Setscrews.

    • Snap rings.

    • Lock pins.

    • O-rings.

    Correct Answer
    A. Setscrews.
  • 14. 

    To check for a short circuit from a motor winding to ground, you would use...

    • A voltmeter.

    • An ohmmeter.

    • An ammeter.

    • A clamp-on ammeter.

    Correct Answer
    A. An ohmmeter.
  • 15. 

    The motor problems that can occur inside a hermetic compressor are...

    • A blown fuse, closed circuit, and grounded circuit.

    • A closed circuit, short circuit, and a blown fuse.

    • A grounded circuit, closed circuit, and a short circuit.

    • An open circuit, short circuit, and grounded circuit.

    Correct Answer
    A. An open circuit, short circuit, and grounded circuit.
  • 16. 

    A motor that has a bad run capacitor.

    • Will not start.

    • May run at normal speed.

    • May run at a lower-than-normal speed.

    • Will run at a higher-than-normal speed.

    Correct Answer
    A. May run at a lower-than-normal speed.
  • 17. 

    What is the most likely problem if the temperature difference between the inlet and outlet water in a water-cooled condenser is lower than normal?

    • The water flow is sufficient.

    • There is too much water flow.

    • There is not enough water flow.

    • The cooling tower fan just cycled on.

    Correct Answer
    A. There is too much water flow.
  • 18. 

    What conditions are an indication of an overcharge in a system that is not equipped with an automatic expansion valve?

    • Low suction pressure and high discharge pressure.

    • High suction pressure and low discharge pressure.

    • Low suction pressure and low discharge pressure.

    • High suction pressure and high discharge pressure.

    Correct Answer
    A. High suction pressure and high discharge pressure.
  • 19. 

    The most probable causes of an inefficient evaporator are...

    • A dirty coil and a fan running too slow.

    • A dirty coil and a high suction pressure.

    • Too much airflow and a high suction pressure.

    • Too much airflow and a fan running too slow.

    Correct Answer
    A. A dirty coil and a fan running too slow.
  • 20. 

    You have removed and recovered the refrigerant from a system and solder repaired a leak. Before you recharge the unit, you must first perform...

    • A 4-hour standing vacuum test.

    • An operational test of the system.

    • Recurring maintenance.

    • A leak check.

    Correct Answer
    A. A leak check.
  • 21. 

    The function of the indoor coil on a heat pump unit is to...

    • Be a condenser in summer and an evaporator in winter.

    • Be an evaporator in summer and a condenser in winter.

    • Act only as an evaporator.

    • Act only as a condenser.

    Correct Answer
    A. Be an evaporator in summer and a condenser in winter.
  • 22. 

    When does the outdoor unit on a heat pump act as an evaporator?

    • Fall.

    • Spring.

    • Summer.

    • Winter.

    Correct Answer
    A. Winter.
  • 23. 

    What type of switch is used to prove there is water flow in both the chilled-water and condenser water circuits?

    • Flow.

    • Pressure.

    • Water-sending.

    • Velocity-sending.

    Correct Answer
    A. Flow.
  • 24. 

    Before you start the compressor on a centrifugal chiller, you must verify there is oil pressure. To do this, you would start the oil...

    • Pump in manual.

    • Sump in manual.

    • Pump in auto.

    • Sump in auto.

    Correct Answer
    A. Pump in manual.
  • 25. 

    What should be done to water chillers during the winter?

    • Completely filled with antifreeze.

    • Completely filled with water.

    • Completely drained.

    • All of the above.

    Correct Answer
    A. Completely drained.
  • 26. 

    A short circuit will occur in the windings of a motor when the conductors in the windings...

    • Touch each other.

    • Expand and contract.

    • Pull apart from each other.

    • Create a high amperage draw.

    Correct Answer
    A. Touch each other.
  • 27. 

    Calculate the discharge pressure for an R-502 system operating at 95°F outside ambient temperature.

    • 95°F + 15°F = 110°F and 245 psig.

    • 95°F + 20°F = 115°F and 265 psig.

    • 95°F + 25°F = 120°F and 286 psig

    • 95°F + 30°F = 125°F and 301 psig

    Correct Answer
    A. 95°F + 30°F = 125°F and 301 psig
  • 28. 

    Which is designed to stop the defrost cycle of a low-temperature walk-in?

    • Low-pressure motor control.

    • High-pressure safety switch.

    • Termination switch.

    • Oil pressure switch.

    Correct Answer
    A. Termination switch.
  • 29. 

    When an exact replacement compressor for a refrigerator cannot be obtained, you would gather all data from the...

    • Compressor nameplate only.

    • Refrigerator nameplate only.

    • Refrigerator nameplate and draw a diagram of the compressor lines and mounting.

    • Compressor nameplate and draw a diagram of the compressor lines and mounting.

    Correct Answer
    A. Compressor nameplate and draw a diagram of the compressor lines and mounting.
  • 30. 

    The three components that operate in the cooling mode are the...

    • Compressor, the evaporator, and the outdoor fan.

    • Indoor fan, the compressor, and the outdoor fan.

    • Compressor, the indoor fan, and the defrost cycle.

    • Outdoor fan, the indoor fan, and the auxiliary heat.

    Correct Answer
    A. Indoor fan, the compressor, and the outdoor fan.
  • 31. 

    A start capacitor on an electric motor is constructed as a...

    • Wet type.

    • Dry type.

    • Round type.

    • Square type.

    Correct Answer
    A. Dry type.
  • 32. 

    What type of electrical problems will a hermetic compressor have?

    • Open circuit.

    • Short circuit.

    • Grounded circuit.

    • All of the above.

    Correct Answer
    A. All of the above.
  • 33. 

    A single-phase condition in a three-phase motor can be caused by...

    • A defective start capacitor.

    • A burned motor.

    • A blown fuse.

    • A closed circuit.

    Correct Answer
    A. A blown fuse.
  • 34. 

    What is the possible cause when a motor will not start, hums, and trips on overload?

    • Incorrect overload switch.

    • Open disconnect switch.

    • Incorrect power supply.

    • Open fuse or breaker.

    Correct Answer
    A. Incorrect power supply.
  • 35. 

    What condensing temperature is normally maintained to obtain adequate pressure drops across an expansion valve?

    • 95°F

    • 105°F

    • 115°F

    • 125°F

    Correct Answer
    A. 105°F
  • 36. 

    When the thermal bulb of an expansion valve is loose from the suction line, you would expect the...

    • Suction line to be warmer than normal.

    • Suction line to be colder than normal.

    • Discharge line to be warmer than normal.

    • Discharge line to be colder than normal.

    Correct Answer
    A. Suction line to be colder than normal.
  • 37. 

    A refrigerator may have condensation (sweat) on the outside of the cabinet if the...

    • Mullion heater is defective.

    • Defrost time clock is defective.

    • Defrost termination switch is defective.

    • Evaporator fan motor is defective.

    Correct Answer
    A. Mullion heater is defective.
  • 38. 

    You can reduce the danger involved in attaching high-pressure gauges on a manifold by shutting off the...

    • Refrigerant and allowing it to cool.

    • High side and allowing the pressures to equalize.

    • Valves and allowing the pressures to equalize.

    • Unit and allowing the pressures to equalize.

    Correct Answer
    A. Unit and allowing the pressures to equalize.
    Explanation
    "Shutting off the unit and allowing the pressures to equalize" was marked correct on the official test.

    Rate this question:

  • 39. 

    You are preparing to troubleshoot a system for an electrical problem. Before you start to troubleshoot the components, you would verify that the...

    • Power supply is energized and the voltage is correct.

    • Connections are mechanically and electrically sound.

    • Contacts on all relays are clean and free to move.

    • Wires are all electrically insulated and tight.

    Correct Answer
    A. Power supply is energized and the voltage is correct.
  • 40. 

    What is used to supplement the unit when the outdoor temperature drops to a point where the heat pump becomes inefficient?

    • Auxiliary refrigerant.

    • Auxiliary forced air.

    • Auxiliary heat.

    • All of the above.

    Correct Answer
    A. Auxiliary heat.
  • 41. 

    An oil sample from the crankcase of a centrifugal compressor should be sent to an oil laboratory on...

    • A monthly basis.

    • A quarterly basis.

    • A semiannual basis.

    • An annual basis.

    Correct Answer
    A. An annual basis.
  • 42. 

    Which thermostat terminal passes power to the indoor fan?

    • R

    • G

    • W

    • Y

    Correct Answer
    A. G
  • 43. 

    Which terminals would you use to determine why a thermostat does not pass power to the relays when a split-system air-conditioner unit is in the cooling mode?

    • R, G, and W.

    • R, G, and Y.

    • V, B, and W.

    • V, B, and Y.

    Correct Answer
    A. R, G, and Y.
  • 44. 

    A run capacitor on an electric motor is constructed as a...

    • Metal can.

    • Paper can.

    • Plastic can.

    • Bakelite iron can.

    Correct Answer
    A. Metal can.
  • 45. 

    The temperature range of a refrigeration system depends upon the...

    • Product being refrigerated.

    • Condensing temperature.

    • Size of the compressor.

    • Ambient temperature.

    Correct Answer
    A. Product being refrigerated.
  • 46. 

    To maintain 75 percent humidity in a refrigeration system with a temperature range of 25 to 45°F, the appropriate coil-to-air temperature difference would be...

    • 8 to 12°F

    • 10 to 14°F

    • 12 to 16°F

    • 16 to 22°F

    Correct Answer
    A. 16 to 22°F
  • 47. 

    When the compressor is off and the system is up to the highest point of its operating range, the evaporator coil pressure should correspond to the...

    • Compressor pressure.

    • Condenser pressure.

    • Air temperature in the box.

    • Air temperature at the condenser.

    Correct Answer
    A. Air temperature in the box.
  • 48. 

    Which is an indication that the defrost system is not operating properly?

    • Defrost is terminated by the time clock.

    • The unit operates with excessive head pressure.

    • The unit operates with excessive suction pressure.

    • Manually initiated defrost is terminated by the temperature sensing device.

    Correct Answer
    A. Manually initiated defrost is terminated by the temperature sensing device.
  • 49. 

    You make a continuity check on a compressor. The check indicates that the common circuit in the compressor is open. You feel the compressor dome and it is very hot. in this situation, you would suspect that the...

    • Capacitor is open.

    • Run windings are open.

    • Start windings are open.

    • Internal overload protector is open.

    Correct Answer
    A. Internal overload protector is open.

Quiz Review Timeline (Updated): Mar 21, 2022 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2022
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 01, 2017
    Quiz Created by
    XxxHitman21xxx
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