Topics: All categories in the pool
1: A mercury bulb controller is not recommended for
- use where vibration is severe
- low voltage use
- line or low voltage use
- line voltage use
2: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIG
- PSIA
- temperature minus pounds of air per second divided by release rate squared
3: "E" represents _____ in the Watt's law formula.
- watts
- voltage
- reactance
- amperage
4: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
5: Adjusting the spring pressure on a TXV
- changes subcooling
- makes no difference
- adjusts the bulb charge
- changes superheat
6: The proper location for an oil separator is between the
- evaporator and compressor
- receiver and metering device
- condenser and receiver
- compressor and condenser
7: Class 3 refrigerants are
- non-flammable
- highly flammable
- toxic
- non-toxic
8: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 2
- 5
- 1
9: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- to allow easy compressor start-up
- when the compressor is off
10: Ammonia is under what safety classification?
- B2
- B3
- B1
- A3
11: The ASHRAE Standard 34 requires what type of alarm for equipment rooms using HCFC-123?
- A group sensing
- phosgene gas sening
- refrigerant sensing
- CO Sensing
12: How much refrigerant can be stored in a mechanical room outside of the system?
- 200
- 100
- 150
- 330
13: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
14: The critical temperature of a refrigerant gas occurs when
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- the gas is no longer saturated
- any decrease in pressure will cause condensation
15: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
16: Which oil is hydoscopic?
- SW30
- mineral
- animal
- polyolester
17: 1 Watt = ______ BTU's?
- 4.482
- 12
- 3.412
- 7.216
18: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- business occupancy
- public assembly occupancy.
- commercial occupancy
- mercantile occupancy
19: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
20: On a centrifugal compressor, stationary diffuser vanes are needed to
- prevent high pressure on the packing
- stop gas flow
- increase the clearance space
- convert velocity energy to pressure
21: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- MSCA Code
22: With a 5/8" X 5/8" x 3/4" tee, what size is the center connection?
- 1/2"
- 5/8"
- 3/8"
- 3/4"
23: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
24: Pi equals approximately
- 12,000
- 746
- 3.14
- 3.41
25: A device used to measure small pressure differences is the
- phsycometirc
- manometer
- pyrometer
- anemometer