Topics: All categories in the pool
1: If you have a motor of 2 HP or less and under 300V, you can use a single pole switch (light switch) with what rating?
- 5x FLA
- 2x FLA
- 3x FLA
- 4x FLA
2: Where can 50/50 solder be used on?
- suction line
- liquid line
- discharge line
- none of the above
3: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
- any decrease in pressure will cause condensation
4: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- lift voltage
- boost voltage
- run voltage
- pick-up voltage
5: Where a refrigeration or air conditioning system is installed,
- it shall not be operated below prescribed pressuers
- A field inspection shall be made before it is put into service
- the form or certificate shall be authorized by the Department of Public Safety
- The company who installed the system must notify the fire department in the jurisdiction where installed
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: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
8: Where is the high-side float located on a chiller system?
- discharge line
- inside the chiller barrel
- liquid line
- flash line
9: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- 10,000,000 ohms or higher
- up to 1,000 ohms
- up to 1,000,000 ohms
10: Secondary refrigerants are usually
- expensive
- alcohol
- water or brine
- Prestone anti-freeze
11: What instrument is used to measure very high resistance?
- meg ohmmeter
- tape measure
- voltmeter
- ammeter
12: A tachometer is an instrument used to measure
- speed
- air velocity
- RPM
- static pressure
13: A single pole-double throw switch uses how many wires?(excluding the ground)
- 3
- 5
- 2
- 4
14: A thermometer inside a duct measures ____ heat.
- sensible
- latent
- specific
- hidden
15: Low pressure chiller systems use what type of compressor?
- Centrifugal
- Screw
- Scroll
- Reciprocating
16: What is an example of institutional occupancy?
- Football stadium
- Shopping mall
- Dorms
- Hospital
17: If the power element of an expansion valve should lose its charge the valve would
- overfeed the evaporator
- underfeed the evaporator
- go closed
- go open
18: A hissing noise at the expansion valve is a good indication that
- gas is passing thru it
- liquid is passing thru it
- nothing is passing thru
- expansion valve is oversized
19: The outer portion of shell of the compressor used on low-pressure chillers is called the
- suction
- baffle
- nozzle
- volute
20: While water is evaporated in an evaporative condenser the impurities which were in the water are
- washed out of the air by the spray pump
- remain in the air
- blown to the atmosphere by the fan
- accumulate in the sump water
21: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 550 lbs
- 330 lbs.
- 660 lbs
22: Ammonia (NH3) is a group III refrigerant
- True
- False
23: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- fusion plug
- rupture plug
24: A EPR valve is installed on what type of evaporators?
- plate evaporators
- low-temperature evaporators
- high-temperature evaporators
- shell and tube evaporators
25: The measurement of heat in a particular substance is
- specific heat
- latent heat
- enthalpy
- sensible heat