Topics: All categories in the pool
1: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- mercantile occupancy
- public assembly occupancy.
- commercial occupancy
- business occupancy
2: What is the state of the refrigerant leaving the evaporator?
- a high temperature superheated vapor
- a low temperature subcooled liquid
- a high temperature subcooled liquid
- low temperature superheated vapor
3: What is Trichlorotrifluoromethane?
- R-12
- R-113
- R-13
- R-11
4: Which occupancy can ammonia be used in?
- commercial
- depends on the quantity of freon
- redifential
- industrial
5: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 24,000 BTU
- 144 BTU
- 970 BTU
- 12,000 BTU
6: What type of oil is used in R-410A systems?
- naphthene
- polyolester (POE)
- mineral oil
- polyalkylene glycol (PAG)
7: A check valve is a device
- designed to allow the flow of refrigerant gas in both directions
- that is always spring loaded
- with a pressure drop
- found on high pressure steam systems
8: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- hold up to 110% of the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
- receive the pumpdown charge
9: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
- At 75% of its full rated speed
- At 50% of its full rated speed
10: Cooling tower lowers condenser water temp by
- evaporative cooling
- running fans at 100%
- condensation
- running water thru a secondary heat exchanger
11: Halogen refrigerants are corrosive to which type of metal?
- copper
- magnesium
- black iron
- stainless steel
12: A high side float is a
- 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
- float type valve that controls the amount of refrigerant stored in the receiver
13: If a purge unit fails on a low pressure chiller, what are the symptoms?
- increased capacity
- low suction pressure
- low pressure chillers do not have purge units
- high head pressure
14: What is the minimum height refrigeration piping should be placed against walls?
- Ceiling height
- 6'
- 7.25'
- 72"
15: Stop valves shall not be permitted between the system and the
- condenser
- bleed valve
- relief valve
- service valve
16: The leaving chilled water set point for comfort cooling is typically?
- 45
- 60
- 38
- 66
17: Control systems can be classified by
- economy of operation
- tonnage of system
- safety
- source of power
18: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- tight fitting doors
- automatic ventilation
19: 1 Watt = ______ BTU's?
- 7.216
- 12
- 3.412
- 4.482
20: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and frost line
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, paper method, and frost line.
- sight glass, weight, pressure, and dipstick
21: Mercury was used in thermometers primarily because it
- never freezes
- was inexpensive
- expands uniformly
- vaporizes at very high temperatures
22: Who authorizes changes to the safety codes?
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
- Person who pulled the permit
23: What is the purpose of a surge capacitor on a contactor?
- to keep the contactor pulled in
- to balance the sine waves
- to protect low voltage equipment
- to provide smoother start/stops
24: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
25: Each machinery room shall contain
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- 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