Maintenance Test
AIR CONDITIONING
1. The transformer in the Air Handler is used in the heating cycle only.
TRUE _______
FALSE _______
2. If the compressor and fan motor run, but the evaporator fan does not, the probable cause is the sequencer.
TRUE _______
FALSE _______
3. You find water dripping out of the Air Handler. The probable cause is?
A. Refrigerant leak
B. Unit is overcharged
C. Unit is undercharged
D. Condensate line is blocked
4. You charge a split residential A/C system with?
A. R23
B. R24
C. R12
D. R22
5. A setting of 70 PSI on your low side A/C gauges will always be right.
TRUE _______
FALSE _______
6. You add R-22 gas to the low side of the compressor.
TRUE _______
FALSE _______
7. What are the three letters on a compressor terminal block?
A. C.S.T.
B. R.C.T.
C. R-22
D. C.S.R.
8. The white wire coming off the thermostat is used to turn on the condenser.
TRUE ______
FALSE ______
9. The compressor changes the refrigerant from a high pressure liquid to a low pressure liquid.
TRUE ______
FALSE ______
10. When checking for a grounded compressor, you
A. OHM out C. to S.
B. OHM out S. to R.
C. C, S, R, to Ground
D. A and B
11. The transformer converts electric current from 240 Volt A/C to 24 Volt D.C.
TRUE ______
FALSE ______
12. Ice on the Low Side line is a sign of
A. Overcharged
B. Undercharged
C. Inside fan motor not running
D. Both B and C
13. In the evaporator, the refrigerant changes from a
A. Liquid to a Vapor
B. Vapor to a Liquid
C. Vapor to Liquid/ Vapor
14. Refrigerant may be in various physical states when A/C system is in operation. Match up the right stages.
A. Suction Line (1) Cool Gas
B. High pressure line between (2) Low pressure gas/High pressure gas
condenser and cap tubes
C. Inlet of compressor – outlet (3) High pressure gas
of compressor
15. High Head (375 – 450) and low suction (30 to 40 PSI) indicates?
A. The right charge
B. Undercharged
C. Plugged suction line
D. Plugged highside line
E. Both or either C – D
16. Ambient temperature is 100 degrees – temperature in the apartment is 95 degrees; when charged properly, your low side gauge should read.
A. 30 to 40 PSI
B. 40 to 60 PSI
C. 60 to 75 PSI
D. 75 to 90 PSI
17. When a condenser is dirty, your gauges will read.
A. Low and high side reads low
B. Suction and liquid line read high
C. Suction high and liquid low
D. None of the above
18. When the A/C is not cooling, your gauges read 60 PSI low 80 PSI high. The problem is?
A. Low on refrigerant
B. Overcharged
C. Plugged cap tube
D. Bad valves in compressor.
19. Which of the following is equal to 1 ton of Air Conditioning?
A. 12,000 BTU
B. 18,000 BTU
C. 24,000 BTU
D. None of the above
ELECTRIC HEAT
1. The wiring going to a 4 KW heat strip is burned up. What size wire do you use to fix the heater?
A. #6
B. #8
C. #10
D. #12
2. A two bedroom apartment has two heat strips in the air handler. One heat strip is burned out. How do you know what size heat strip to put back in?
A. It will always be a 4 KW
B. Take amp reading on working heat strip with power off.
C. Take amp reading on burned out heat strip.
D. Take amp reading with power on the working heat strip.
3. A two bedroom apartment temperature out of vent in bedroom #1 is 110 degrees and bedroom #2 is 75 degrees. What would you look for?
A. A bad sequencer
B. A tripped breaker
C. A bad fan relay
D. Heat strip and fuse link.
4. If a heating element is marked 5 KW, it means?
A. The element heats in 5 minutes
B. 5000 Watts
C. 500 Watts
D. Heats 5 times the amp rating
5. The heater is heating, but is turning on and off rapidly, the problem is?
A. Weak limits switch
B. Wrong fuse link installed
C. Thermostat anticipator not set right.
D. W and R wires are crossed.
E. Both A & C
6. A thermostat is marked on the back side W R G Y, match these letters with the following:
A. Heat _____
B. Cool _____
C. Fan _____
D. Power_____
7. What purpose does a high limit switch serve?
A. Keeps oven from overheating.
B. Cuts off power to heating element.
C. Keeps the compressor from over heating.
8. Where is a fuse link located?
A. Breaker box
B. Stove element
C. Water heater
D. Heat coil
9. L-160 printed on a heating high limit means the device
A. is rated for 160 hours
B. is rated for 160 amps
C. is rated for 160 volts
D. is rated to open at 160 degrees
10. With a supplied 240 volts to heating system, you read 25 amps, what size is the KW heat strip?
A. 3 KW
B. 4 KW
C. 5 KW
D. 6 KW
11. With the thermostat set for heat and the heat strips are coming on, but the fan won’t come on, what should you check?
A. check for 120 volts to fan motor
B. check or replace fan relay
C. check breakers
D. check for 240 volts to fan motor
12. A heat coil pulls 33.3 amps with a supplied voltage of 240, what would the KW output be?
A. 3 KW
B. 4 KW
C. 7 KW
D. 8 KW
13. You read 120 Volts on each terminal on the heat strip to ground, but 0 volts between the terminals. The problem could be.
A. Broken heat strip
B. Bad fuse link
C. Bad fan relay
D. Both A and B
14. A strip heater will pull _____ amps at 240 volts per KW.
A. 2.6 amps
B. 3.5 amps
C. 4.17 amps
D. 16 amps
15. A sequencer coil is controlled by
A. 120 volts A/C
B. 240 volts A/C
C. 12 volts D.C.
D. 24 volts A/C
16. A sequencer is a time delay relay
TRUE _____
FALSE _____
17. A double stack sequencer is used to turn on the heat strip 1st,and after a delay (1 to 2 minutes) turn the fan on.
TRUE ______
FALSE ______
18. The heat strip will not turn off. The probable cause is
A. The fan relay
B. The thermostat
C. The sequencer
D. Both B and C
19. The fan motor runs all the time, but the heat strip does not come on. What should you check?
A. The fan relay
B. The thermostat
C. The sequencer
D. A or B
REFRIGERATORS
1. The most common refrigerant used in household refrigerators manufactured today is?
A. R-12
B. R-22
C. R-11
D. None of the above
2. The coil behind or underneath a refrigerator is called.
A. The evaporator
B. The radiator
C. The condenser
3. What starts a frost free refrigerator’s defrost cycle?
A. The overload switch
B. A bi-metal strip
C. The frost build up sensor
D. The timer
4. Water stands in the bottom of the refrigerator. The probable cause is.
A. Defrost timer is not operating
B. Ice maker water line is broken
C. Plugged drain line
D. None of the above
ELECTRIC RANGES
1. You can calibrate the oven temperature by adjusting the switch knob.
TRUE _____
FALSE _____
2. Erratic temperature in an oven is usually caused by a faulty
A. Switch
B. Safety Limit Valve
C. Faulty High Limit
D. Thermostat
3. One burner on a 4 burner stove will not work. The probable cause is
A. Burned wire to burner
B. Tripped breaker
C. Burned out burner
D. Bad switch
E. A & C
ELECTRIC
1. What two wires do not carry a load?
A. Green/Bare
B. Bare/Black
C. Red/Bare
2. The Appliance Branch Circuit should be no less than a 20 amp breaker.
TRUE _____
FALSE _____
3. With a water heater pulling 23 amps, what size heating element will it have?
A. 24 KW
B. 5.5 KW
C. 4 KW
D. 3.5 KW
4. Normal house current is
A. Single phase
B. Double phase
C. Three phase
5. A stove and water heater both operate on 240 Volt D.C.
TRUE _____
FALSE _____
6. A G.F.I. is required in all outside outlets
TRUE ______
FALSE ______
7. What are the amp ratings for the following?
A. 10 G A ____
B. 12 G A ____
C. 14 G A ____
8. Duplex outlets can be 20 A, 30 A, or 40 A.
TRUE _____
FALSE _____
9. A 240 Volt circuit consists of L-1, L-2 and a common.
TRUE _____
FALSE _____
10. When a circuit breaker keeps tripping, you should check for.
A. Bad breaker
B. Loose wiring
C. Short in the circuit
D. All of the above
11. A circuit with 1100 watts and 10 amps, the voltage is
A. 120
B. 240
C. 277
D. 110
12. A circuit with 10 amps and 240 volts, the wattage is
A. 1100 watts
B. 1500 watts
C. 2400 watts
D. 5500 watts
MISCELLANEOUS
1. Green boards would likely be used in?
A. Living room walls
B. Bath floors
C. Roof
D. None of the above
2. Improper or missing grout in tile may cause?
A. Wall rot
B. Water leakage damage
C. Mildew/ odors
D. All of the above
3. Joint compound can be mixed to a paint consistency and used as texture.
TRUE _____
FALSE _____
4. Black mold can be corrected with Kiltz.
TRUE _____
FALSE _____
POOLS
1. The chlorine level in a pool should be kept at?
A. 0.05
B. .05 to 1.5
C. 1.5 to 3
D. Over 3
2. The P.H. level in a pool should be kept at?
A. 6.5 to 7.0
B. 8.5 to 9
C. 7.2 to 7.4
D. Over 9
3. The most common cause of green water.
A. P.H. too high
B. P.H. too low
C. Low chlorine level
D. None of the above
4. Pools should be shocked monthly
TRUE ______
FALSE ______
5. You can treat green algae by
A. Algaecide and soda ash
B. Shock treat and algaecide
C. Drain pool and wash with acid
D. Backwashing
DISHWASHER
1. Dishwasher hums, but will not run. The probable cause is?
A. The sill valve solenoid is stuck
B. The seal is frozen
C. The oscillator arm is broken
D. None of the above
2. The dishwasher runs, but will not drain. The probable cause is?
A. D/W motor is burned out
B. Plugged fill valve
C. Plugged drain line
D. None of the above
3. The dishwasher drain line drains into the garbage disposal.
TRUE ______
FALSE ______
4. Incoming water temperature for a dishwasher must be at least 150 degrees.
TRUE ______
FALSE ______
PLUMBING
1. A wax seal is used on the
A. Sink trap
B. Tub P-trap
C. Bathroom toilet
D. None of the above
2. What type of valve allows water to flow in one direction?
A. Gate valve
B. Balloon valve
C. Check valve
D. Ball valve
3. If a T and P valve is leaking, you can sometimes tap the end to stop it from leaking.
TRUE _____
FALSE _____
4. A P-trap under a sink prevents?
A. Water from backing up in sink.
B. Gives easy access for cleaning
C. Prevents sewer gas from coming out of sink
D. None of the above
_FORMS\Maintenance Test.doc