Topics: All categories in the pool
1: What is absolute humidity?
- the amount of moisture in the air per one pound of 50% RH air
- the amount of moisture in the air in grains of cubic feet of volume
- the amount of moisture in the air in grains of square feet of volume
- none of the above
2: Clearance volume
- affects compressor capacity
- varies depending on compressor speed
- is the same on all compressors
- has no effect on compressor capacity
3: What is the minimum height refrigeration piping should be placed against walls?
- 7.25'
- 6'
- 72"
- Ceiling height
4: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to protect low voltage equipment
- to balance the sine waves
- to keep the contactor pulled in
5: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Wet bulb temperature
- Critical temperature
- Saturated temperature
- Dry bulb temperature
6: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
7: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- public assembly occupancy
- mixed occupancy
- institutional occupancy
- commercial occupancy
8: 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
9: Humidity can be sensed with
- pressure bellows
- bimetal
- human hair
- thermometer
10: What is a high-side float?
- 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
- 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, 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
- 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
11: Copper and its alloys shall not be used with ammonia
- True
- False
12: What is the maximum voltage range allowed on an electrical circuit?
- 10%
- 15%
- 5%
- 20%
13: Pressure vessels having design pressures of 15 psig or less shall have the strength to withstand at least ______times the design pressure.
- 5.5
- 3.0
- 2.5
- 2.0
14: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
15: "I" represents ____ in the Ohm's law formula.
- amperage
- voltage.
- resistance
- capacitance
16: At higher altitudes, boiling temperatures
- are unaffected
- increase
- depends on the refrigerant
- decrease
17: 746 watts is equal to
- Pi
- 10 hp
- 1 hp
- 100 hp
18: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
19: A restaurant is classified as a
- commercial occupancy
- large mercantile occupancy
- public assembly occupancy
- mixed occupancy
20: "P" represents ______ in the Watt's law formula
- voltage
- amperage
- watts
- reactance
21: How many groups of refrigerants are there?
- 7
- 5
- 1
- 3
22: A movie theater would be considered a
- mixed occupancy
- commercial occupancy
- institutional occupancy
- public assembly occupancy
23: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Manometer
- Anemomter
- Barometer
24: What is potential measured in?
- Volts
- Henrys
- Ohms
- Amps
25: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 1
- 2
- 5