Topics: All categories in the pool
1: R-123 belongs to Group
- B-2
- A-3
- B-3
- B-1
2: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution crystallizes.
3: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class B machinery room
- Class M machinery room
- Class T machinery room
- Class A machinery room
4: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- water being pulled into the system
- system refrigerant leaking from the system
- air being pulled into the system
5: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- design pressure
- critical pressure
- high pressure
- low pressure
6: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
- between the compressor and the stop valve
7: 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
8: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When there are sprinklers above
- When it's used as part of a supply or return air system
- When there is a space 6' or more above it
- When its white
9: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 100
- 80
- 90
- 110
10: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Nothing
- Increasae
- Decrease
11: A positive displacement compressor is
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
12: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
13: Pressure is equivalent of
- Force / Area
- Force
- Force X Area
- Area X Force
14: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
15: What is Absolute Zero?
- -773F
- -460F
- -640F
- -400F
16: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- the high side
- the low side
- 2.5 times the design pressure
17: Setting a pressure relief device shall not exceed ___ of the design pressure
- 80%
- 100%
- 90%
- 75%
18: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
19: What is NOT a positive displacement compressor.
- Centrifugal
- Scroll
- Reciprocating
- Rotary
20: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
21: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection and a rupture disc
- over pressure protection
- over pressure protection as well as a temperature protection device
22: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
23: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
24: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 square feet or less
- 3 cubic feet or more
- 15 cubic feet or more
25: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above