Topics: All categories in the pool
1: 1 HP = ____ Watts?
- 3,412
- 3.1416
- 746
- 11,239
2: A high side float is a
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the crankcase oil level
- float type valve that controls the amount of refrigerant stored in the receiver
3: A relief valve discharge capacity is rated in
- PSIA
- PSIG
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
4: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- nothing must be done
- place sign, check for leaks, insulate
5: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
6: Secondary refrigerants are usually
- alcohol
- Prestone anti-freeze
- expensive
- water or brine
7: How is bring measured?
- hygrometer
- hydrometer
- manometer
- anemometer
8: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 110
- 330
- 6.6
- 1,000
9: What device should be used on low-temperature freezers?
- hot-gas by-pass
- discharge muffler
- oil separator
- high capacity TXV
10: Which of the following is NOT a positive displacement compressor?
- reciprocating
- scroll
- centrifugal
- screw
11: Adjusting the spring pressure on a TXV
- changes superheat
- changes subcooling
- adjusts the bulb charge
- makes no difference
12: E = I X R is
- Impedance Law
- Watts Law
- Ohms Law
- Amps Law
13: How many opening forces operate a thermostatic expansion valve?
- 1
- 4
- 2
- 3
14: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
15: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- R-718
- methyl chloride
- trichlorotrifluoromethane
- ammonia
16: R-11 belongs to Group
- B-3
- B-1
- A-1
- A-2
17: The difference between saturated liquid and saturated vapor is
- volume
- temperature
- heat
- pressure
18: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 48
- 18
- 24
19: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
20: Ammonia vaporization takes place at what temperature?
- -110F
- -32F
- -28F
- -460F
21: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
22: The density of a gas refers to
- pounds per absolute pressure
- pounds per cubic foot
- pounds per square foot
- cubic feet per pound
23: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- every 24 months
- annually
24: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- True
- depends on the type of refrigerant being used
- are obsolete.
- False
25: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 18
- 24
- 15
- 10