Maintenance And Troubleshooting Trivia Quiz!
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- 1.To safely check an electrical component for continuity or resistance, you would turn
- A.
On the power and disconnnect 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 realy
- 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.
Comrpessor, the indoor fan, and the defrost cycle
- D.
Outdoor fan, the indoor fan, and auxiliary heat
- 6.Most manufacturers illustrate the wiring in their equipment through the use of
- A.
Pictoral and line diagrams
- B.
Line and sectional diagrams
- C.
Sectional and pictoral diagrams
- D.
Sectional and enhanced diamgrams
- 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 trouble 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, & W
- B.
R, G, & Y
- C.
V, B, & W
- D.
V, B, & 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.
Fram mount
- 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 anmeter
- D.
A clamp-on meter
- 17.A run capacitor on an eletric motor is constructed as a
- A.
Metal can
- B.
Paper can
- C.
Plastic can
- D.
Bakelite iron can
- 18.A start capacitor on an eletric 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 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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