Topics: All categories in the pool
1: What type refrigerant is NOT ozone depleting?
- HCFC
- CFC
- HFC
- Halon
2: "E" references ____ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
3: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 9.776 watts
- 977.6 watts
- 9,776 watts
- .9776 watts
4: What refrigerant has zero ozone depletion
- HFC
- CFC
- HCFC
- None of the above
5: How many forces operate a thermostatic expansion valve?
- 4
- 1
- 2
- 3
6: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
7: What device measures the specific gravity of a substance?
- Hygrometer
- Hydrometer
- Thermometer
- Manometer
8: The measurement of heat in a particular substance is
- specific heat
- sensible heat
- enthalpy
- latent heat
9: A thermometer inside a duct measures ____ heat.
- specific
- hidden
- sensible
- latent
10: Gauge pressure is
- Absolute pressrue
- Atmospheric pressure
- Force of pressure above that of atmosphere
- Barometric pressure
11: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
12: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
13: The two basic types of evaporators are
- flooded and direct expansion
- direct expansion and plate
- finned and plate
- prime surface and finned
14: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High suction pressure and high discharge pressure.
- Low head pressure and high suction pressure
- Low suction pressure and low discharge pressure
- High head pressure and low suction pressure
15: The leaving chilled water set point for comfort cooling is typically?
- 38
- 66
- 45
- 60
16: What section of ASHRAE-15 governs pressure vessels?
- OSHA
- Section 6 ASHRAE-34 ASME VIII unfired
- Section 9 ASHRAE-15 ASME VIII unfired
- Section 7 ASHRAE-15 ASME VIII fired
17: How does a centrifugal compressor create the pressure differential needed to move refrigerant through the system?
- Suction and discharge valves
- Nesting scrolls
- Rotating vanes
- Fan-like action
18: Trichlorofluoromethane is the name of what refrigerant?
- R-113
- R-12
- R-11
- R-502
19: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-2
- A-2
- B-1
20: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
21: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- ammonia
- trichlorotrifluoromethane
- R-718
- methyl chloride
22: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
23: The generator shell contains the
- condenser, the evaporator, and the generator
- evaporator and the absorber
- condenser and the absorber
- condenser and the generator
24: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- bi-annually
- quarterly
- annually
25: Humidity can be sensed with
- human hair
- thermometer
- pressure bellows
- bimetal