3e151: Electrical Safety Hardest Trivia Questions! 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!
- 1.To safely check an electrical component for continuity or resistance, you would turn...
- A.
On the power and disconnect at least one lead from the meter.
- B.
Off the power and disconnect at least one lead from the meter.
- C.
On the power and disconnect at least one lead from the component.
- D.
Off the power and disconnect at least one lead from the component.
- 2.Which thermostat terminal passes power to the heat relay?
- A.
R
- B.
G
- C.
W
- D.
Y
- 3.Which thermostat terminal passes power to the indoor fan?
- A.
R
- B.
G
- C.
W
- D.
Y
- 4.Which fan circuit contacts must be closed to pass power to the fan motor?
- A.
Fan relay
- B.
Fan speed relay
- C.
Evaporator relay
- D.
Condenser relay
- 5.The three components that operate in the cooling mode are the...
- A.
Compressor, the evaporator, and the outdoor fan.
- B.
Indoor fan, the compressor, and the outdoor fan.
- C.
Compressor, the indoor fan, and the defrost cycle.
- D.
Outdoor fan, the indoor fan, and the auxiliary heat.
- 6.Most manufacturers illustrate the wiring in their equipment through the use of...
- A.
Pictorial and line diagrams.
- B.
Line and sectional diagrams.
- C.
Sectional and pictorial diagrams.
- D.
Sectional and enhanced diagrams.
- 7.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...
- A.
Control voltage.
- B.
No control voltage.
- C.
Too much control voltage.
- D.
Not enough control voltage.
- 8.You use your volt-ohm-milliammeter to check a transformer. You find it has an open. In this situation, the probable cause is...
- A.
No control voltage.
- B.
A burned transformer.
- C.
No power to the G terminal.
- D.
A wire burned off the compressor.
- 9.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...
- A.
R wire is broken.
- B.
Contacts are broken.
- C.
Y wire is broken.
- D.
R and Y wires are both broken.
- 10.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?
- A.
R, G, and W.
- B.
R, G, and Y.
- C.
V, B, and W.
- D.
V, B, and Y.
- 11.After you have disabled a motor disconnect, you lock and tag the panel. After this, you should be sure to keep the only key.
- A.
At the shop.
- B.
On your person.
- C.
With your crew leader.
- D.
With your shop supervisor.
- 12.Mechanical motor problems normally occur at the...
- A.
Pulley or belt drive.
- B.
Bearings or the shaft.
- C.
Pulleys or the shafts.
- D.
End bells or ball bearings.
- 13.Most assemblies are held on the motor shaft by...
- A.
Setscrews.
- B.
Snap rings.
- C.
Lock pins.
- D.
O-rings.
- 14.If the motor drive pulley and the driven pulley are out of line, strain will be imposed on the...
- A.
Starting circuit.
- B.
Frame mounts.
- C.
Motor air system.
- D.
Shafts' drive mechanism.
- 15.A short circuit will occur in the windings of a motor when the conductors in the windings...
- A.
Touch each other.
- B.
Expand and contract.
- C.
Pull apart from each other.
- D.
Create a high amperage draw.
- 16.To check for a short circuit from a motor winding to ground, you would use...
- A.
A voltmeter.
- B.
An ohmmeter.
- C.
An ammeter.
- D.
A clamp-on ammeter.
- 17.A run capacitor on an electric motor is constructed as a...
- A.
Metal can.
- B.
Paper can.
- C.
Plastic can.
- D.
Bakelite iron can.
- 18.A start capacitor on an electric motor is constructed as a...
- A.
Wet type.
- B.
Dry type.
- C.
Round type.
- D.
Square type.
- 19.The motor problems that can occur inside a hermetic compressor are...
- A.
A blown fuse, closed circuit, and grounded circuit.
- B.
A closed circuit, short circuit, and a blown fuse.
- C.
A grounded circuit, closed circuit, and a short circuit.
- D.
An open circuit, short circuit, and grounded circuit.
- 20.A motor that has a bad run capacitor.
- A.
Will not start.
- B.
May run at normal speed.
- C.
May run at a lower-than-normal speed.
- D.
Will run at a higher-than-normal speed.
- 21.What type of electrical problems will a hermetic compressor have?
- A.
Open circuit.
- B.
Short circuit.
- C.
Grounded circuit.
- D.
All of the above.
- 22.A single-phase condition in a three-phase motor can be caused by...
- A.
A defective start capacitor.
- B.
A burned motor.
- C.
A blown fuse.
- D.
A closed circuit.
- 23.What is the possible cause when a motor will not start, hums, and trips on overload?
- A.
Incorrect overload switch.
- B.
Open disconnect switch.
- C.
Incorrect power supply.
- D.
Open fuse or breaker.
- 24.The temperature range of a refrigeration system depends upon the...
- A.
Product being refrigerated.
- B.
Condensing temperature.
- C.
Size of the compressor.
- D.
Ambient temperature.
- 25.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...
- A.
8 to 12°F
- B.
10 to 14°F
- C.
12 to 16°F
- D.
16 to 22°F
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