Topics: All categories in the pool
1: Humidity can be sensed with
- bimetal
- pressure bellows
- thermometer
- human hair
2: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
3: Pressure is the equivalent of
- force per unit area
- force
- force times area
- area times force
4: Transformers are rated in
- amps
- volts
- volt-amps
- volts-ohms
5: Which of the following controllers would you expect to be most sensitive to temperature changes?
- line voltage t-stat
- low voltage t-stat
- immersion controller
- aquastat
6: What is Trichlorotrifluoromethane?
- R-11
- R-113
- R-12
- R-13
7: Fractionation occurs when
- the pressures increase as the heat load increases
- when a fraction of refrigerant is added as the full charge
- the pressures decreases as the heat load decreases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
8: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
9: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
10: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UL and UM
- UM or UL
- UV or UR
11: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 16.64
- 3.415
- 6.830
- 34.15
12: What is the refrigerant dichlorodifluoromethane?
- R-123
- R-22
- R-134A
- R-12
13: When releasing a hydrogenated hydrocarbon refrigerant to the atmosphere, ample ventilation must be provided and
- the owner shall be informed
- no flames shall be permitted
- gas masks must be worn
- explosion precautions must be taken
14: E = I X R is
- Impedance Law
- Watts Law
- Ohms Law
- Amps Law
15: Give an example of a secondary coolant?
- R-12
- R-410A
- R-717
- R-718
16: How is bring measured?
- hydrometer
- anemometer
- manometer
- hygrometer
17: The instrument used to measure the specific gravity of absorption chiller solutions is the
- Psychrometer
- hydrometer
- refractometer
- anemometer
18: R-22 is considered a(n)
- CFC
- HCFCH
- HFC
- HCFC
19: Usually dry bulb temperature is
- same as wet bulb temperature
- not important and shall be ignored
- higher than wet bulb temperature
- lower than dry bulb temperature
20: 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
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
21: What refrigerant is an inorganic compound?
- R-132A
- R-22
- Ammonia
- R-410A
22: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- ball valves
- gate or globe valves
- king valves
23: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 10 amps
- There isn't enough information to answer.
- 20 amps
- 24 amps
24: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 50
- 100
- 75
- 24
25: The measurement of heat in a particular substance is
- enthalpy
- sensible heat
- latent heat
- specific heat