Topics: All categories in the pool
1: How many opening forces operate a thermostatic expansion valve?
- 3
- 4
- 2
- 1
2: Who approves containers for refrigerants?
- D.O.T
- D.O.E
- E.P.A
- D.O.D
3: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
4: It takes how many BTU/hr to melt one pound of ice at 32F
- 212
- 180
- 970
- 144
5: Give an example of a secondary coolant?
- R-717
- R-410A
- R-718
- R-12
6: Which refrigerant was still able to be vented to the atmosphere after July 1, 1992?
- R-11
- R-22
- R-12
- R-113
7: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 27 ohms
- 80 ohms
- 104 ohms
- 71 ohms
8: How many CFMs are required per square foot of commercial office occupied space
- 5 CFM
- 20 CFM
- 15 CFM
- .5 CFM
9: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the liquid side of the system
- the vapor side of the system
- low side of the system
- high side of the system
10: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 108
- 88
- 38
- 116
11: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
12: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- low head pressure
- not enough oil in the system
- moisture in the system
- oil in evaporator
13: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- automatic ventilation
- self-closing doors
- tight fitting doors
14: 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 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
- 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
15: A moisture indicator must
- change color when exposed to moisture
- be sight side up
- be yellow
- be filled with liquid
16: While the system is operating, the discharge line should be
- room temperature
- 10-15F warmer than ambient
- too hot to hold by hand
- at the same temperature as the crankcase
17: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
- outside the room, immediately adjacent to each door
18: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 3
- 2
- 5
- 1
19: Instead of using a compressor, an absorption air-conditioning chiller uses which of the following as its driving force?
- Heat
- Air
- Oil
- Electricity
20: How many different groups of refrigerants are there?
- 11
- 7
- 15
- 3
21: Ohm's Law indicates Amps X Resistance = ___________.
- Current
- Ohms
- Impedance
- Volts
22: What is considered a cooling agent?
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat without condensation
23: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 240v
- 277v
- 120v
- 208v
24: "I" represents _______ in the Watt's law formula.
- amperage
- voltage
- reactance
- watts
25: Large Mercantile occupancy is a premise or that portion of a premise where more than ____ persons congregate on levels above or below the street level to purchase personal merchandise.
- 100
- 400
- 350
- 250