Topics: All categories in the pool
1: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
- Suction line at the compressor
2: What is the purpose of a surge capacitor on a contactor?
- to provide smoother start/stops
- to protect low voltage equipment
- to keep the contactor pulled in
- to balance the sine waves
3: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
4: Low temperature systems should have what?
- High pour point
- Low pour point
- High viscosity
- None of the above
5: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
6: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
7: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
8: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 116
- 38
- 108
9: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- up to 1,000 ohms
- 10,000,000 ohms or higher
- up to 1,000,000 ohms
10: "E" references ____ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
11: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers
12: How many refrigerant classifications are there for flammability?
- 7
- 1
- 2
- 3
13: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
- Watts = volts X amps
14: Class T machine room
- 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
- shall include closets used for setting equipment
15: The density of a gas refers to
- pounds per cubic foot
- cubic feet per pound
- pounds per square foot
- pounds per absolute pressure
16: Increasing superheat will do what to your frost line?
- Decrease
- Nothing
- Could either increase or decrease depending on the load conditions
- Increasae
17: When a receiver is greater than 3 cubic feet but less than 10 cubic feed, what is the minimum relief device required?
- fusible plug
- relief valve
- rupture disc
- all of the above
18: 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.
- 250
- 400
- 350
- 100
19: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 212
- 180
- 970
20: A water regulating valve opens when
- when the power is on
- the head pressure rises
- the compressor is on
- when the power is on there is an overcharge of refrigerant
21: 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
- 75
- 100
- 24
22: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
23: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to sweat flanges on the refrigeration piping
- to release a sticking valve
- to remove from from TXV's and evaporator coils
24: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
25: R-12 is
- dichloromethane
- trichlorofluoromethane
- dichlorodifluoromethane
- dichlorofluoromethane