313D Final Exam Flashcards
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
Compressor amperage will rise
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
Liquid line diameter
Because of the heat of compression, condensers must remove more than the evaporator absorbs.
1. True
2. False
True
What instrument is used to measure airflow?
1. Velometer
2. Potentiometer
3. Thermometer
Velometer
The constant opening and closing of a TXV is called?
1. Spring action
2. Modulation
3. Hunting
4. Continuity
Hunting
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
Potential relay
To decrease the superheat on a TXV, turn the spring..?
1. Counter-clock wise
2. Clockwise
Counter-clock wise
To increase the superheat on a TXV, turn the spring…?
1. Clockwise
2. Counter-clock wise
Clockwise
What instrument is used to measure specific gravity of a liquid?
1. Hydrometer
2. Hygrometer
3. Velometer
4. Sling psychrometer
Hydrometer
What other instrument can be used to determined the amount of moisture in the air?
1. Hydrometer
2. Hygrometer
3. Velometer
4. Ohmmeter
Hygrometer
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
Wet bulb and dry bulb temperature
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
Lower than dew point
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
Slope away from the compressor
How many cfm/ton for a heat pump?
1. 800CFM
2. 400CFM
3. 450CFM
4. 300CFM
450CFM
Normal CFM/Ton for an AC system?
1. 800CFM
2. 400CFM
3. 450CFM
4. 300CFM
400CFM
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
Reverse the leads at the start winding
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
To bleed off stored charge in the off cycle
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
In the liquid line before the the evaporator
