Topics: All categories in the pool
1: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- centrifugal switch
- printed circuit board (PCB)
- motor starter
- duel-voltage switch
2: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 116
- 88
- 108
- 38
3: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 257 psig, 77 psig
- 226 psig, 68 psig
- 455 psig, 185 psig
- 350 psig, 120 psig
4: What kind of material can't be used on the outlet of a relief valve?
- PVC
- Stainless Steel
- Aluminum
- Copper
5: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- a high temperature subcooled liquid
- low temperature superheated vapor
6: A restaurant is classified as a
- commercial occupancy
- mixed occupancy
- large mercantile occupancy
- public assembly occupancy
7: A class A3 refrigerant is considered
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
- toxic and somewhat flammable
8: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
9: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
10: "I" represents _______ in the Watt's law formula.
- amperage
- watts
- reactance
- voltage
11: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
12: What type refrigerant is NOT ozone depleting?
- HCFC
- HFC
- Halon
- CFC
13: What device should be used on low-temperature freezers?
- oil separator
- high capacity TXV
- discharge muffler
- hot-gas by-pass
14: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 240 volts
- 2.40 volts
- 2,400 volts
- 24.0 volts
15: What type of pressure relief device is used on a CO2 system?
- Rupture disk
- Glove valve
- Gate valve
- Fusible plug
16: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 70.8 psig
- 43.3 psig
- 66.1 psig
17: What is an example of institutional occupancy?
- Hospital
- Football stadium
- Dorms
- Shopping mall
18: The actual expansion curve of compression follows most nearly which one of the following curves?
- Pressure Temperature
- Isothermal
- Volume Temperature
- Adiabatic
19: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
20: A pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 50
- 25
- 22
- 66
21: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 70F
- 77F
- 32F
- 58F
22: Heat transferred by conduction from one body to another is done
- via solids
- via radiation
- via liquids
- via heat rays
23: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
24: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 50
- 550
- 350
- 100
25: Secondary refrigerants are usually
- expensive
- alcohol
- Prestone anti-freeze
- water or brine