Topics: All categories in the pool
1: What type of pressure relief device is used on a CO2 system?
- Fusible plug
- Glove valve
- Rupture disk
- Gate valve
2: How many opening forces operate a thermostatic expansion valve?
- 1
- 4
- 3
- 2
3: How many gallons of water do you need per pound of ammonia?
- 10
- 50
- 100
- 1
4: What is potential measured in?
- Volts
- Amps
- Henrys
- Ohms
5: High pressure controls should be set no higher than
- 10% of set point
- 80% of set point
- 90% of set point
- 25% of set point
6: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
7: The formula for Pure Power in a resistance circuit is
- Watts X amps.
- Watts = volts X amps
- Kw = volts X amps
- Watts X power factor
8: What is the amp draw of a 40 VA transformer at 24 volts
- 106 amps
- 1K amps
- 1,000 amps
- 1.6 amps
9: Which is considered the more efficient condenser?
- spray cooled
- fan cooled
- air cooled
- water cooled
10: 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.
- ammonia
- Lithium bromide
- CFC-11
- HCFC-123
11: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- business occupancy
- mercantile occupancy
- public assembly occupancy.
- commercial occupancy
12: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.25'
- 7.00'
- 8'4"
- 9.00'
13: In an A/C unit, dirty filters will cause
- high discharge pressure
- high suction pressur
- low oil pressure
- low suction pressure
14: The main purpose of the accumulator is to
- prevent liquid slugs at the compressor
- store liquid refrigerant
- provide space for the accumulation of oil and containminants
- provide space for vapor to accumulate
15: Which of the following is not an air velocity meter?
- Anemometer
- Hydrometer
- Velometer
- Anemotherm
16: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
17: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- 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 switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the crankcase oil level
18: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
19: What instrument is used to measure very high resistance?
- voltmeter
- meg ohmmeter
- tape measure
- ammeter
20: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
21: A hissing noise at the expansion valve is a good indication that
- liquid is passing thru it
- nothing is passing thru
- expansion valve is oversized
- gas is passing thru it
22: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 110 lbs
- 65 lbs
23: In a motor, an internal overload might open if
- there's a direct short
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
24: Where would the EPR valve be located on a multiple evaporator system?
- outlet of the liquid line
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- inlet of the low temperature evaporator.
25: 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