Topics: All categories in the pool
1: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- underfeed the evaporator
- overfeed the evaporator
2: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 15 cubic feet or more
- 3 cubic feet or more
- 3 cubic feet or less
3: What is an example of institutional occupancy?
- Dorms
- Shopping mall
- Hospital
- Football stadium
4: The most common type of motor starter is
- delts-wye starter
- duel-winding starter
- across the line starter
- part winding starter
5: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- False
- are obsolete.
- depends on the type of refrigerant being used
- True
6: The rupture disc on a low-pressure chiller typically releases pressure at
- 10 psig
- 5 psig
- 15 psig
- 0 psig
7: Which winding have the most turns?
- Start
- run
- they have equal amount of turns
- depends on the motor phase
8: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- CFC-11
- Lithium bromide
- HCFC-123
- ammonia
9: 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
10: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
11: The principle used in continuous type absorption systems is
- Charles's Law
- Boyle's Law
- Ohm's Law
- Dalton's Law
12: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- 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
13: All low-pressure chillers use which type of compressor?
- Reciprocating
- Rotary
- Scroll
- Centrifugal
14: How many closing forces operate a thermostatic expansion valve?
- 3
- 4
- 1
- 2
15: What instrument is used to measure very high resistance?
- meg ohmmeter
- ammeter
- tape measure
- voltmeter
16: What is R-22?
- Chlorofluoromethane
- CCFCM
- Chlorodifluoromethane
- HFC
17: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
18: The proper location for an oil separator is between the
- compressor and condenser
- receiver and metering device
- condenser and receiver
- evaporator and compressor
19: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 20 amps
- 15 amps
- 10 amps
- 5 amps
20: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Discoloration is prevented
- Copper oxide formation is prevented
- Exterior scale formation is minimized
21: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 1,000
- 6.6
- 110
- 330
22: How many different groups of refrigerants are there?
- 15
- 7
- 11
- 3
23: R-12 is
- dichlorofluoromethane
- trichlorofluoromethane
- dichloromethane
- dichlorodifluoromethane
24: Systems containing more than 110 pounds must have stop valves located at the
- compressor suction inlet
- compressor discharge outlet
- receiver inlet and outlet
- All of the above
25: Which of the following types of oils are hygroscopic?
- polyolester (POE)
- polyalkylene glycol (PAG)
- naphthene mineral
- both a and b