Topics: All categories in the pool
1: The proper location for an oil separator is between the
- receiver and metering device
- evaporator and compressor
- condenser and receiver
- compressor and condenser
2: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
3: A motor starter contains a thermal overload and a
- contactor
- transformer
- 3-way relay
- solenoid
4: How many refrigerant classifications are there for flammability?
- 2
- 7
- 1
- 3
5: Which of the following is NOT a positive displacement compressor?
- reciprocating
- scroll
- centrifugal
- screw
6: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- have no effect on the frost line
- shorten the frost line
- lengthen the frost line
7: Halogenated refrigerants cannot be used with what material?
- Copper
- Stainless steel
- Aluminum
- Magnesium alloy
8: The oil separator is always inserted in the system
- to prevent oil logging
- where it can be easily serviced
- in the discharge line
- in a cool spot
9: Which oil is hydoscopic?
- mineral
- animal
- SW30
- polyolester
10: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
11: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- current draw
- cause of seizure
- designed head pressure
12: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
13: When an inspection is needed, how often must it be done?
- annually
- every 18 months
- every 24 months
- every 36 months
14: Low ambient controls are used when
- economizers are used
- always
- on air conditioning systems only
- when systems run all year round
15: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- a high temperature subcooled liquid
- low temperature superheated vapor
16: What is a high-side float?
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
17: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- moisture in the system
- not enough oil in the system
- low head pressure
- oil in evaporator
18: _____ and its alloys are suitable for use with ammonia systems.
- Zinc
- Copper
- Magnesium
- Aluminum
19: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
20: A start capacitor is wired in _____ with the start windings.
- series
- junction
- series-parallel
- parallel
21: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
22: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 5 amps
- 10 amps
- 15 amps
- 20 amps
23: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 20 amps
- There isn't enough information to answer.
- 24 amps
- 10 amps
24: What would be the classification of a prison?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
25: What section of ASHRAE-15 governs pressure vessels?
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
- OSHA
- Section 9 ASHRAE-15 ASME VIII unfired