Topics: All categories in the pool
1: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- Relief valve
- Circuit Breaker
- T&P device
2: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person in charge of the facility
- Person who pulled the permit
- Board of Boilers
3: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 330
- 110
4: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 2.5, 3.0
- 2.5, 2.5
- 3.0, 3.5
- 6.6, 6.6
5: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 BTU
- The rate of conduction
- 1 Kelvin
- 1 Therm
6: What is the state of the refrigerant leaving the evaporator?
- low temperature superheated vapor
- a high temperature subcooled liquid
- a high temperature superheated vapor
- a low temperature subcooled liquid
7: Booster compressors, pump refrigerant into the
- receiver
- heat & plate heat exchanges
- high side of the secondary compressor
- low side of the primary compressor
8: A compressor that increases vapor pressure by changing the internal volume of the compression chamber is called?
- Non-positive displacement
- Positive displacement
- Low Pressure displacement
- Pressure induced displacement.
9: How many groups of refrigerants are there?
- 7
- 3
- 5
- 1
10: Mercury was used in thermometers primarily because it
- expands uniformly
- was inexpensive
- vaporizes at very high temperatures
- never freezes
11: The most common type of motor starter is
- delts-wye starter
- across the line starter
- duel-winding starter
- part winding starter
12: Humidity can be sensed with
- bimetal
- human hair
- thermometer
- pressure bellows
13: A class B2 refrigerant is considered
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
- toxic and non-flammable
14: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 350
- 400
- 100
- 250
15: How many BTU's is produced by one watt of energy
- 2.57
- 3.41
- 3.00
- 1
16: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
17: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
18: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 43.3 psig
- 70.8 psig
- 50.2 psig
- 66.1 psig
19: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 25
- 22
- 66
- 50
20: Pressure is equivalent of
- Force / Area
- Force
- Area X Force
- Force X Area
21: Sublimation occurs when
- gas is formed from a liquid
- ice melts and turns to water
- gas is formed directly from a solid
- liquid is formed from a gas
22: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
23: Excessive head pressure is often caused by
- thermostat set too high
- leaking reed valve on the discharge side
- air cooled condenser is plugged
- insufficient refrigerant
24: NH3 is
- lithium bromide
- ammonia
- R-508A
- R-718
25: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.