Topics: All categories in the pool
1: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
2: A class A3 refrigerant is considered
- non-toxic and non-flammable
- toxic and non-flammable
- non-toxic but highly flammable
- toxic and somewhat flammable
3: What would be the classification for Stop & Shop grocery store?
- Instituional
- Industrial
- Place of assembly
- Large mercantile
4: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 6.6, 6.6
- 2.5, 3.0
- 2.5, 2.5
- 3.0, 3.5
5: What is the typical air conditioning operating pressures for 410A?
- 60 psi suction, 210 psi discharge
- 25 psi suction, 125 psi discharge
- 105 psi suction, 350 psi discharge
- None of the above
6: Which creates more of a heat load?
- 70% RH
- 30% RH
- 50% RH
- 90% RH
7: How much clearance do you need around the perimeter of electrical panels?
- 36"
- 12"
- 18"
- 24"
8: A relief valve discharge capacity is rated in
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- PSIG
- Pounds of air per minute.
9: 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
- 250
- 350
- 400
10: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- R-718 is not rated unlimited because it's a dangerous refrigerant
- Because it's cheap
- Because it's water
11: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- king valves
- companion or block valves
- gate or globe valves
- ball valves
12: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution evaporates
13: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
14: A thermometer inside a duct measures ____ heat.
- specific
- sensible
- hidden
- latent
15: What are the three components of a transformer?
- Contacts, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
16: All low-pressure chillers use which type of compressor?
- Scroll
- Rotary
- Reciprocating
- Centrifugal
17: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 58F
- 70F
- 32F
- 77F
18: 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
19: The discharge relief valve is located (9.4.6)
- between the compressor and oil separator
- between the compressor and the stop valve
- on top of the condensor
- between the compressor and reciever
20: What is the refrigerant chlorodifluoromethane?
- R-123
- R-134a
- R-12
- R-22
21: An accumulator can be located between the
- condenser and evaporator
- compressor and condenser
- first stage and second stage compressors
- evaporator and compressor
22: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 58
- 88
- 38
- 96
23: 1 Watt = ______ BTU's?
- 12
- 7.216
- 4.482
- 3.412
24: A start capacitor in series with a start winding will
- decrease the amp draw of the motor
- increase running efficiency
- increase the amp draw of the motor
- increase starting torque
25: In an A/C unit, dirty filters will cause
- high discharge pressure
- low oil pressure
- low suction pressure
- high suction pressur