Topics: All categories in the pool
1: "I" represents _______ in the Watt's law formula.
- amperage
- voltage
- watts
- reactance
2: Capacity control on an absorption system is typically accomplished by varying the
- speed of the chilled water circulatory pump
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
- rate at which heat is supplied to the generator
3: When an electronic bridge is in balance the bridge output will be
- 0 volts
- 1 volt
- .01 volts
- 15 volts
4: Total heat of a substance is considered
- enthalpy
- empathetical
- specific heat
- sensible heat
5: 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
6: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
7: Direct systems using Group II refrigerants
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
- shall be allowed to be used for human comfort.
8: The first step in mechanical refrigeration is
- condensation
- expansion
- compression
- evaporation
9: R-22 is classified as a ____ refrigerant on the safety matrix.
- B-1
- A-2
- B-2
- A-1
10: When testing systems using non-positive displacement compressors, the entire system shall be considered for test purposes as the low side.
- True
- False
11: If a refrigerant leaving the condenser is 94F and the condensing temperature is 105F, the subcooling is
- 29F
- 9F
- 11F
- 21F
12: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 55
- 15
- 75
- 50
13: Who is permitted to access a refrigeration machine room?
- Authorized persons only
- Any employee
- Anyone, it's a completely safe area
- Contractors only
14: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 158F
- 32F
- 155F
- 45F
15: In a system designed for sub-zero ambient temperatures, what must be added?
- Low-ambient kit
- Booster compressor
- Infrared dye for leak identification
- Nitrogen
16: 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 amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
17: What type of relief valve is used on a CO2 system?
- gate valve
- rupture disc
- glove disc
- fusible plug
18: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low suction pressure and low discharge pressure
- High head pressure and low suction pressure
- High suction pressure and high discharge pressure.
- Low head pressure and high suction pressure
19: A movie theater would be considered a
- public assembly occupancy
- mixed occupancy
- commercial occupancy
- institutional occupancy
20: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- automatic ventilation
- tight fitting doors
21: Sublimation occurs when
- ice melts and turns to water
- gas is formed from a liquid
- gas is formed directly from a solid
- liquid is formed from a gas
22: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- inside the room, immediately adjacent to each door
23: Horizontal piping should be run level.
- True
- No, unless the supervisor on the job says so.
- Yes, if the condenser is located above the evaporator
- False
24: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of the liquid line
- outlet of high temperature evaporator
- outlet of low temperature evaporator
25: Setting a pressure relief device shall not exceed ___ of the design pressure
- 80%
- 90%
- 100%
- 75%