Topics: All categories in the pool
1: What does safe access mean?
- A clear unobstructed path to the equipment and controls
- Well-lit exit signs
- Locked doors
- OSHA approved
2: A halide torch is most useful with a freon compression system
- to release a sticking valve
- to detect refrigeration leaks in piping joints
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
3: Doors communicating with outside from a mechanical room must be?
- Self-closing, approved, fire door
- Self-closing, wooden, fire door
- Self-closing, aligned, fire door
- Steel, approved, weather-stripped
4: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
5: Booster compressors, pump refrigerant into the
- high side of the secondary compressor
- heat & plate heat exchanges
- receiver
- low side of the primary compressor
6: Each machinery room shall contain
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
7: A class B1 refrigerant is considered
- non-toxic and non-flammable
- toxic and somewhat flammable
- toxic but non-flammable
- non-toxic but highly flammable
8: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 108
- 116
- 38
9: The rupture disc on a low-pressure chiller typically releases pressure at
- 0 psig
- 10 psig
- 15 psig
- 5 psig
10: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 36
- 24
- 18
- 48
11: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- three tons of cooling
- one ton of cooling
- two tons of cooling
12: A rule of thumb in air conditioning is ____ CFM per ton?
- 100
- 400
- 600
- 500
13: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- safe access
- service manuals
14: A positive displacement compressor is
- 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 volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
15: "E" represents _____ in the Watt's law formula.
- amperage
- reactance
- voltage
- watts
16: How many different groups of refrigerants are there?
- 7
- 11
- 3
- 15
17: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
18: Humidity can be sensed with
- bimetal
- pressure bellows
- thermometer
- human hair
19: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 500 ohms
- 20 ohms
- 200 ohms
20: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
21: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
22: Ammonia systems use ____ pressure to adjust oil pressure
- discharge
- liquid
- stream
- air
23: The location of a thermal bulb of a TXV affects
- subcooling
- the amount of liquid refrigerant in the evaporator
- the amount of liquid in the condenser.
- the amount of liquid returning to the compressor
24: 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
- 250
- 100
- 400
25: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and non-flammable