Topics: All categories in the pool
1: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Glove valve
- Gate valve
- Rupture disk
2: A moisture indicator must
- be filled with liquid
- be yellow
- change color when exposed to moisture
- be sight side up
3: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- leaking discharge valves in the compressor
- plugged drier
- overcharge of oil
4: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
5: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 800F
- 1,000F
6: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 18"
- 12"
- 24"
7: Suction valve unloaders afford an effective means of
- capacity control
- superheat control
- evaporator control
- refrigerant control
8: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- lost heat
- latent heat
- sensible heat
9: In an A/C unit, dirty filters will cause
- low oil pressure
- high discharge pressure
- high suction pressur
- low suction pressure
10: 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
11: What must be done if refrigeration lines pass through a concrete floor?
- moisture barrier
- installed through a pipe casing
- insulated
- leak checked
12: What pipe can not be used for refrigeration?
- L
- M
- N
- K
13: In an electrical circuit, what is potential measured in?
- Volts
- Herys
- Amps
- Ohms
14: Copper and its alloys shall not be used with ammonia
- True
- False
15: Where is an EPR valve located on a multi-evaporator system?
- Suction line at the compressor
- Suction line of the coolest evaporator
- Suction line of the warmest evaporator
- Suction line prior to the accumulator of the lowest temperature system
16: What is NOT a positive displacement compressor.
- Reciprocating
- Centrifugal
- Scroll
- Rotary
17: Two systems using separate refrigerants that are superimposed upon one another is called
- cascade
- booster
- indirect
- single stage
18: A hotel is considered a _______ occupancy.
- institutional
- residential
- commercial
- mercantile
19: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 208v
- 120v
- 277v
- 240v
20: How is bring measured?
- anemometer
- hydrometer
- hygrometer
- manometer
21: A class B2 refrigerant is considered
- toxic and non-flammable
- non-toxic and highly flammable
- toxic and somewhat flammable
- non-toxic and non-flammable
22: In a motor, an internal overload might open if
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
- there's an excess current draw through the motor
23: "P" represents ______ in the Watt's law formula
- voltage
- watts
- reactance
- amperage
24: Before replacing a seized compressor, the _______ should be determinded.
- type of refrigerant
- designed head pressure
- cause of seizure
- current draw
25: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 96
- 38
- 88
- 58