Topics: All categories in the pool
1: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 75%
- 80%
- 100%
2: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
3: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
4: R-11 has the greatest corrosive effect on
- Magnesium
- Aluminum
- Copper
- Bronze
5: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
- the gas is no longer saturated
- any decrease in pressure will cause condensation
6: The actual expansion curve of compression follows most nearly which one of the following curves?
- Isothermal
- Pressure Temperature
- Adiabatic
- Volume Temperature
7: Low pressure chiller systems use what type of compressor?
- Reciprocating
- Screw
- Scroll
- Centrifugal
8: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2.5
- 2
- 1250
9: Ammonia is under what safety classification?
- B2
- B1
- B3
- A3
10: Most CFC's are
- inert
- inert but toxic
- flammable
- toxic
11: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- duel-voltage switch
- motor starter
- printed circuit board (PCB)
- centrifugal switch
12: What type of copper is not permitted on refrigeration systems?
- Type K
- Type M
- Type N
- Type L
13: 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 low side
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the high side
14: All low-pressure chillers use which type of compressor?
- Rotary
- Scroll
- Centrifugal
- Reciprocating
15: Watt's Law indicates Volts X Amps = _________.
- Resistance
- Ohms
- Current
- Watts
16: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and balanced head and friction head
- GPM, pipe size, and equivalent head.
- GPM and friction head
17: Adjusting the spring pressure on a TXV
- makes no difference
- changes subcooling
- changes superheat
- adjusts the bulb charge
18: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1.2
- 1.5
- 2.2
- 1
19: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- run voltage
- pick up voltage
- boost voltage
20: Who approves containers for refrigerants?
- D.O.E
- D.O.T
- D.O.D
- E.P.A
21: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- king valves
- ball valves
- gate or globe valves
22: NH3 is
- ammonia
- lithium bromide
- R-718
- R-508A
23: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
24: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Moisture and air
- Water and soap
- Oil and water
25: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above