Topics: All categories in the pool
1: What is R-22?
- Chlorofluoromethane
- HFC
- CCFCM
- Chlorodifluoromethane
2: Pressure vessels of 10 cubic feet or more gross volume shall use
- at least one rupture member
- a dual pressure-relief valve if charging into the atmosphere
- at least three means of discharge and/or rupture discs
- both a and b are correct
3: Pipe identification labels are required when the system contains more than
- 55 lbs
- 65 lbs
- 120 lbs
- 110 lbs
4: Pressure vessel having an inside diameter exceeding 6” with an internal pressure greater than 15psig shall be marked directly on or on the nameplate the letters _______________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- “UV”
- “UL”
- “UM” and “UV”
- “U” or “UM”
5: What must be done to refrigerant pipes before being buried ?(8.10.4)
- Leak checked
- Classifed
- Certified
- Insulated and installed in a pipe duct (Encased)
6: Volts x amps equals
- Ohms Law
- Watts
- Impedance
- Inductance
7: Gauge pressure is
- Force of pressure above that of atmosphere
- Atmospheric pressure
- Barometric pressure
- Absolute pressrue
8: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
9: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the aggregate of the high side and low side
- 2.5 times the design pressure
- the low side
- the high side
10: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
11: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
12: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- TXV
- High side float
- Low side float
13: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
14: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- splurge
- merge
- purge
- surge
15: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
16: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
17: How many square inches per square foot?
- 144
- 64
- 24
- 98
18: How many gallons of water per pound of ammonia do you need?
- 20
- 15
- 5
- 1
19: Fractionation occurs when
- the pressures decreases as the heat load decreases
- the pressures increase as the heat load increases
- when a fraction of refrigerant is added as the full charge
- some of the blended refrigerant evaporates or condenses before the rest of the blend
20: How are safety controls wired in a circuit?
- Either series or parallel
- Series/parallel
- Series
- Parallel
21: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 180
- 212
- 144
22: one BTU equals
- 31.4 hp
- 3.41 hp
- Pi
- 12,000 hp
23: The oil separator is always inserted in the system
- in a cool spot
- in the discharge line
- to prevent oil logging
- where it can be easily serviced
24: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- decreases
- run as designed with low ambient controls
- doesn't change
- increases
25: What is the leaving chilled water set point for water chiller systems?
- 38F
- 45F
- 55F
- 66F