Topics: All categories in the pool
1: Which refrigerant class listed below is the most flammable?
- B2
- A3
- C3
- A2
2: What is the minimum size wire you can use on a 30 amp circuit?
- 12 AWG
- 16 AWG
- 14 AWG
- 10 AWG
3: At higher altitudes, the boiling point of refrigerant is
- equal to the coefficient of water at 32F
- the same
- lower
- higher
4: Doors communicating with outside from a mechanical room must be?
- Self-closing, wooden, fire door
- Self-closing, approved, fire door
- Steel, approved, weather-stripped
- Self-closing, aligned, fire door
5: 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
6: Class T machine room
- shall include closets used for setting equipment
- shall have refrigerant leak detecting systems installed inside and outside the room
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
7: A movie theater would be considered a
- institutional occupancy
- public assembly occupancy
- mixed occupancy
- commercial occupancy
8: The low pressure oil safety switch
- must be reset manually
- never trips
- resets itself automatically
- resets itself after the time delay has terminated
9: Usually dry bulb temperature is
- same as wet bulb temperature
- higher than wet bulb temperature
- lower than dry bulb temperature
- not important and shall be ignored
10: Copper and its alloys shall not be used with ammonia
- True
- False
11: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X power factor
- Watts = volts X amps
- Watts X amps.
12: How many refrigerant classifications are there for toxicity?
- 5
- 2
- 1
- 3
13: 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
14: A Low-Probability System
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection can not enter the occupied space
- is a system highly likely to leak form a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
15: How are refrigerant blends classified?
- Based on the oil used
- Based on worst case fractionation
- Based on best case Fractionation
- Blends don't have to be classified
16: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- between the compressor and oil separator
- on top of the condensor
- between the compressor and reciever
17: "R" represents ___ in the Ohm's law formula
- capacitance
- amperage
- resistance
- voltage
18: One atmosphere equals
- 14.7
- 0 psig
- 0 psia
- 29.4
19: A run capacitor is wired in series with the _____ windings.
- start capacitor
- start
- common
- run
20: 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.
- 100
- 350
- 550
- 50
21: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
22: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- EEV
- Solenoid valve
- CPR valve
- EPR valve
23: 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
- 108
- 88
- 38
24: A capacitor in series with the start windings will do what?
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase starting torque
- Increase run efficiency by 10% of its rating
25: What is not a requirement of a class T machine room?
- fire hose connection to the building fire protection system
- self-closing doors
- tight fitting doors
- automatic ventilation