Topics: All categories in the pool
1: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
- GPM and balanced head and friction head
2: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
3: What is the refrigerant chlorodifluoromethane?
- R-22
- R-12
- R-123
- R-134a
4: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use pressure relief devices or fusible plugs
- shall use fusible plugs
- shall use pressure relief devices
5: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 50% of its full rated speed
- At 75% of its full rated speed
- At 25% of its full rated speed
6: Electricity involves the movement of electrons in atoms
- True
- False
7: Setting a pressure relief device shall not exceed ___ of the design pressure
- 90%
- 80%
- 100%
- 75%
8: A thermometer inside a duct measures ____ heat.
- specific
- hidden
- latent
- sensible
9: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- 1 Therm
- 1 BTU
- The rate of conduction
10: Bubbles in the liquid line sight glass could be caused by
- bad low pressure switch
- plugged drier
- leaking discharge valves in the compressor
- overcharge of oil
11: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- sensible heat
- evaporation of the water droplets
12: Where would the EPR valve be located on a multiple evaporator system?
- outlet of high temperature evaporator
- inlet of the low temperature evaporator.
- outlet of the liquid line
- outlet of low temperature evaporator
13: The formula for Pure Power in a resistance circuit is
- Watts X power factor
- Watts = volts X amps
- Watts X amps.
- Kw = volts X amps
14: What refrigerant is an inorganic compound?
- Ammonia
- R-22
- R-410A
- R-132A
15: The color code of a tank of ammonia is
- lavender
- white
- silver
- light green
16: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
17: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 70.8 psig
- 43.3 psig
- 66.1 psig
- 50.2 psig
18: A class B2 refrigerant is considered
- non-toxic and highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
- toxic and non-flammable
19: What is the leaving chilled water set point for water chiller systems?
- 66F
- 55F
- 45F
- 38F
20: A halide torch is most useful with a freon compression system
- to remove from from TXV's and evaporator coils
- to sweat flanges on the refrigeration piping
- to release a sticking valve
- to detect refrigeration leaks in piping joints
21: NH3 is
- R-718
- R-508A
- lithium bromide
- ammonia
22: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
23: Which winding have the most turns?
- Start
- they have equal amount of turns
- run
- depends on the motor phase
24: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
25: Booster compressors, pump refrigerant into the
- receiver
- heat & plate heat exchanges
- low side of the primary compressor
- high side of the secondary compressor