Topics: All categories in the pool
1: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
2: How are refrigerant blends classified?
- Based on the oil used
- Blends don't have to be classified
- Based on worst case fractionation
- Based on best case Fractionation
3: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
4: Horizontal piping should be run level.
- Yes, if the condenser is located above the evaporator
- No, unless the supervisor on the job says so.
- True
- False
5: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low suction pressure
- low pressure chillers do not have purge units
- high head pressure
- increased capacity
6: The leaving chilled water set point for comfort cooling is typically?
- 66
- 45
- 60
- 38
7: Halogen refrigerants are corrosive to which type of metal?
- stainless steel
- copper
- magnesium
- black iron
8: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 43.3 psig
- 66.1 psig
- 50.2 psig
9: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 3.415
- 34.15
- 6.830
- 16.64
10: 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
11: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
12: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 12,000 BTU
- 144 BTU
- 970 BTU
- 24,000 BTU
13: The critical temperature of a refrigerant gas occurs when
- the gas returns to a liquid
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
14: What is the voltage of each leg of a 480 Volt three-phase motor?
- 277v
- 120v
- 240v
- 208v
15: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
16: A start capacitor is wired in _____ with the start windings.
- series-parallel
- parallel
- series
- junction
17: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- tower fans
- evaporation of the water droplets
- sensible heat
18: What is Absolute Zero?
- -400F
- -773F
- -460F
- -640F
19: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2.5
- 2
- 1250
20: Adjusting the spring pressure on a TXV
- changes superheat
- makes no difference
- adjusts the bulb charge
- changes subcooling
21: Pi equals approximately
- 3.41
- 746
- 12,000
- 3.14
22: The critical temperature of a refrigerant gas occurs when
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
23: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
24: Most CFC's are
- flammable
- inert but toxic
- toxic
- inert
25: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above