Topics: All categories in the pool
1: Which oil is hydoscopic?
- mineral
- polyolester
- animal
- SW30
2: A rule of thumb in air conditioning is ____ CFM per ton?
- 400
- 100
- 600
- 500
3: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic but non-flammable
- toxic and highly flammable
4: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
5: The Department that certifies the transportation of refrigerant is the
- EPO
- DOT
- EPA
- RSES
6: On a centrifugal compressor, stationary diffuser vanes are needed to
- increase the clearance space
- convert velocity energy to pressure
- stop gas flow
- prevent high pressure on the packing
7: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- OSHA
- Section ASHREA 34
8: No open flames are allowed in the machinery room unless?
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
- Never can be allowed
- Approved by the authorized person
9: A movie theater would be considered a
- public assembly occupancy
- commercial occupancy
- mixed occupancy
- institutional occupancy
10: What is NOT a positive displacement compressor.
- Scroll
- Centrifugal
- Rotary
- Reciprocating
11: Liquid refrigerant flashing, or turning to vapor, in the liquid line may be due to
- liquid line that is too small
- shortage of refrigerant
- liquid line that had too high vertical lift
- All of the above
12: one BTU equals
- 12,000 hp
- 31.4 hp
- Pi
- 3.41 hp
13: The principle used in continuous type absorption systems is
- Ohm's Law
- Charles's Law
- Boyle's Law
- Dalton's Law
14: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
15: One ton of refrigeration is defined as ______ btu/minute.
- 720,000
- 60
- 200
- 12,000
16: R-12. R-22, and R-40 are considered Group I refrigerants.
- True
- False
17: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- lengthen the frost line
- shorten the frost line
- allow more liquid into the evaporator
18: How is bring measured?
- anemometer
- manometer
- hydrometer
- hygrometer
19: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 34.15
- 3.415
- 6.830
- 16.64
20: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
21: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
22: When the compressor is below the condensor
- traps are needed on the discharge line
- traps are not needed on this type of system
- traps are needed on the oil return line
- traps are needed on the suction line
23: NH3 is
- ammonia
- R-508A
- R-718
- lithium bromide
24: What is an example of institutional occupancy?
- Shopping mall
- Dorms
- Football stadium
- Hospital
25: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Critical temperature
- Dry bulb temperature
- Wet bulb temperature
- Saturated temperature