313D Final Exam

Question 1

If a water regulating valve for a condenser is jammed and too restritive…?
1. Compressor amperage will be reduced
2. Compressor amperage will rise
3. Compressor amperage will not be affected

Answer 1

Compressor amperage will rise

Question 2

What should you consider when your evap is 65’ lower than the condenser?
1. Oil traps in the liquid line
2. Metering because the liquid pressure will be low
3. Liquid line diameter
4. All of the above
5. None of the above

Answer 2

Liquid line diameter

Question 3

Because of the heat of compression, condensers must remove more than the evaporator absorbs.
1. True
2. False

Answer 3

True

Question 4

What instrument is used to measure airflow?
1. Velometer
2. Potentiometer
3. Thermometer

Answer 4

Velometer

Question 5

The constant opening and closing of a TXV is called?
1. Spring action
2. Modulation
3. Hunting
4. Continuity

Answer 5

Hunting

Question 6

What removes the start capacitor from the circuit when the compressor reaches 75% of its synchronous speed?
1. Contactor
2. Capacitor
3. Fan relay
4. Potential relay

Answer 6

Potential relay

Question 7

To decrease the superheat on a TXV, turn the spring..?
1. Counter-clock wise
2. Clockwise

Answer 7

Counter-clock wise

Question 8

To increase the superheat on a TXV, turn the spring…?
1. Clockwise
2. Counter-clock wise

Answer 8

Clockwise

Question 9

What instrument is used to measure specific gravity of a liquid?
1. Hydrometer
2. Hygrometer
3. Velometer
4. Sling psychrometer

Answer 9

Hydrometer

Question 10

What other instrument can be used to determined the amount of moisture in the air?
1. Hydrometer
2. Hygrometer
3. Velometer
4. Ohmmeter

Answer 10

Hygrometer

Question 11

What two values are required to measure relative humidity(RH)
1. Dry bulb and Atmospheric pressure
2. Wet bulb and Atmospheric pressure
3. Suction line and discharge pressure
4. Wet bulb and dry bulb temperature

Answer 11

Wet bulb and dry bulb temperature

Question 12

Condensation on a suction line will occur when the suction line temperature is…?
1. Higher than dew point
2. Lower than dew point
3. Higher than atmospheric pressure
4. Lower than atmospheric pressure

Answer 12

Lower than dew point

Question 13

Suction and discharge lines should always……?
1. Slope back to the evaporator
2. Should never sloped
3. Slope back towards the compressor
4. Slope away from the compressor

Answer 13

Slope away from the compressor

Question 14

How many cfm/ton for a heat pump?
1. 800CFM
2. 400CFM
3. 450CFM
4. 300CFM

Answer 14

450CFM

Question 15

Normal CFM/Ton for an AC system?
1. 800CFM
2. 400CFM
3. 450CFM
4. 300CFM

Answer 15

400CFM

Question 16

How do you reverse the rotation of a CSCR motor?
1. Add additional leads to the run winding
2. Remove the black lead to the start winding
3. Reverse the leads at the start winding
4. Remove the white lead to the neutral winding

Answer 16

Reverse the leads at the start winding

Question 17

Why is a bleed resistor used on a capacitor?
1. To bleed off stored charge in the off cycle
2. To bleed off stored charge while energized
3. To provide extra starting torque
4. To prevent the stored charge from equalizing in the capacitor in the off cycle

Answer 17

To bleed off stored charge in the off cycle

Question 19

Where should a liquid line filter drier be installed?
1. In the suction line before the evaporator
2. In the liquid line before the evaporator
3. In the suction line after the evaporator
4. In the liquid line after the evaporator

Answer 19

In the liquid line before the the evaporator