Topics: All categories in the pool
1: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 22
- 18
- 33
2: Gauge pressure is
- force of pressure above that of atmospheric
- what a gauge reads when checking pressures on a chilled water system.
- atmospheric pressure
- absolute pressure
3: How are refrigerant blends classified?
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
- Based on best case Fractionation
4: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- ball valves
- king valves
- gate or globe valves
5: What must be done if refrigeration lines pass through a concrete floor?
- installed through a pipe casing
- moisture barrier
- insulated
- leak checked
6: Class T machine room
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
7: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
8: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- blue
- orange
- green
- red
9: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
10: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
11: Which winding have the most turns?
- they have equal amount of turns
- run
- Start
- depends on the motor phase
12: What is the typical air conditioning operating pressures for R-22?
- 60 psi suction 210 psi discharge
- 25 psi suction 125 psi discharge
- 105 psi suction 340 psi discharge
- None of the above
13: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the mechanical room housing the refrigeration system
- the outdoors
- Machinery rooms need not be vented
- the return air ducted system
14: The instrument used to measure the specific gravity of absorption chiller solutions is the
- Psychrometer
- hydrometer
- refractometer
- anemometer
15: While water is evaporated in an evaporative condenser the impurities which were in the water are
- accumulate in the sump water
- blown to the atmosphere by the fan
- remain in the air
- washed out of the air by the spray pump
16: It takes how many BTU/hr to melt one pound of ice at 32F
- 212
- 970
- 144
- 180
17: Heat is a form of
- power
- energy
- matter
- work
18: A high side float is a
- float type valve that controls the crankcase oil level
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type valve that controls the amount of refrigerant stored in the receiver
- float type switch that stops the compressor when the pressure on the high side becomes too high
19: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- cooling temperature set-point
- adjustment of the spring tension of the TXV
- opening at the pump outlet
- opening at the pump inlet
20: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution crystallizes.
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
21: Group A2 refrigerants have a ______ toxicity rating than Group B1 refrigerants.
- lower
- there is no Group B1 refrigerants
- higher
- the same
22: A run capacitor is wired in series with the _____ windings.
- run
- common
- start capacitor
- start
23: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
24: In an electrical circuit, what is potential measured in?
- Ohms
- Volts
- Amps
- Herys
25: The oil separator is always inserted in the system
- to prevent oil logging
- where it can be easily serviced
- in a cool spot
- in the discharge line