Topics: All categories in the pool
1: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
2: The difference between saturated liquid and saturated vapor is
- volume
- temperature
- heat
- pressure
3: All low-pressure chillers use which type of compressor?
- Scroll
- Centrifugal
- Rotary
- Reciprocating
4: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Magnesium
- Aluminum
- Zinc
5: Volts x amps equals
- Inductance
- Ohms Law
- Watts
- Impedance
6: What is the boiling point of refrigerant governed by?
- Compressor RPM's
- Condenser sub-cooling
- P&T relationship
- Evaporator temperature
7: What refrigerant doesn't have to be classified?
- R-134A
- R-717
- R-422A
- R-718
8: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- latent heat
- sensible heat
- specific heat
- lost heat
9: 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
10: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 5KW
- 600 watts
- 1000 watts
11: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Simple
- Low pressure
- R-414B
12: What does an anemometer measure?
- voltage
- temperature
- velocity
- amperage
13: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- The Li-Br solution will become more diluted
- The Li-Br solution will become more concentrated
- Rust can form
- System operating pressure will drop
14: A split-phase motor has a ______ winding and a ____ winding
- start, common
- duel-run, duel-start
- run, start
- run, common
15: A moisture indicator must
- be filled with liquid
- change color when exposed to moisture
- be yellow
- be sight side up
16: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Circuit Breaker
- Temperature limiter device
- Relief valve
- T&P device
17: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- quarterly
- annually
- bi-annually
18: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 BTU
- 1 Kelvin
- 1 Therm
- The rate of conduction
19: A rule of thumb in air conditioning is ____ CFM per ton?
- 400
- 500
- 600
- 100
20: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
21: R-11 belongs to Group
- B-3
- A-1
- A-2
- B-1
22: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- institutional occupancy
- public assembly occupancy
- commercial occupancy
- mixed occupancy
23: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- merge
- purge
- surge
- splurge
24: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-718
- Flush with RX-11
- Flush with ammonia
- Flush with R-11
25: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b