Topics: All categories in the pool
1: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
2: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
3: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Electricity
- Oil
- Air
- Heat
4: The proper location for an oil separator is between the
- evaporator and compressor
- compressor and condenser
- receiver and metering device
- condenser and receiver
5: R-123 belongs to Group
- B-3
- B-1
- A-3
- B-2
6: What is R-22?
- CCFCM
- Chlorofluoromethane
- Chlorodifluoromethane
- HFC
7: 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
8: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 66.1 psig
- 70.8 psig
- 43.3 psig
9: Start to Run windings will have what resistance?
- The most resistance value
- All will be at equal values
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
10: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 75
- 24
- 100
11: 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
12: A professional or office building would be considered what type of occupancy?
- commercial
- public assembly
- mercantile
- business
13: Which of the following is NOT a positive displacement compressor?
- reciprocating
- screw
- centrifugal
- scroll
14: The best way to determine the voltage requirement for an electrical component is to
- read the voltage with a mulitmeter
- determine the capacity of the service panel
- check with the utility company
- read the nameplate data
15: Excessive head pressure is often caused by
- insufficient refrigerant
- leaking reed valve on the discharge side
- thermostat set too high
- air cooled condenser is plugged
16: The most common type of motor starter is
- delts-wye starter
- duel-winding starter
- part winding starter
- across the line starter
17: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 110
- 90
- 100
- 80
18: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
19: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
20: 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
21: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- opening at the pump inlet
- opening at the pump outlet
- cooling temperature set-point
- adjustment of the spring tension of the TXV
22: Gauge pressure is
- force of pressure above that of atmospheric
- atmospheric pressure
- absolute pressure
- what a gauge reads when checking pressures on a chilled water system.
23: One ton of refrigeration is defined as ______ btu/minute.
- 200
- 60
- 12,000
- 720,000
24: How many gallons of water do you need per pound of ammonia?
- 1
- 50
- 10
- 100
25: An accumulator can be located between the
- evaporator and compressor
- first stage and second stage compressors
- condenser and evaporator
- compressor and condenser