Topics: All categories in the pool
1: Pressure relief devices are marked with a ____________ signifying compliance with the ASME Boiler & Pressure Vessel Code.
- UL and UR
- UM or UL
- UV or UR
- UL and UM
2: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- run as designed with low ambient controls
- doesn't change
- increases
- decreases
3: What pipe can not be used for refrigeration?
- N
- L
- K
- M
4: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Muffler
- Moisture indicator
- Foot valve
5: R-718 is rated unlimited for refrigeration quantity contained in a system. Why?
- Because it's a non-flammable refrigerant
- Because it's water
- Because it's cheap
- R-718 is not rated unlimited because it's a dangerous refrigerant
6: How many square inches per square foot?
- 64
- 98
- 144
- 24
7: Control systems can be classified by
- source of power
- economy of operation
- tonnage of system
- safety
8: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
9: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the expansion valve
- start the fan and circulating pump
- start the comrpessor
- reset the safety valve
10: Class A refrigerants are considered
- toxic
- flammable
- non-flammable
- non-toxic
11: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Kelvin
- 1 BTU
- The rate of conduction
- 1 Therm
12: Direct systems using Group II refrigerants
- shall be allowed to be used for human comfort.
- shall not be used for air condition for human comfort
- shall be installed per instruction of the AHJ
- shall be installed in Class T machinery rooms
13: The evaporator is a device to
- Keep the compressor busy
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
14: How are a compressor and condenser fan wired?
- series
- parallel
- series-parallel
- parallel-series
15: When the compressor is below the condensor
- traps are needed on the discharge line
- traps are needed on the oil return line
- traps are needed on the suction line
- traps are not needed on this type of system
16: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
17: Usually dry bulb temperature is
- lower than dry bulb temperature
- same as wet bulb temperature
- not important and shall be ignored
- higher than wet bulb temperature
18: How many refrigerant classifications are there for flammability?
- 1
- 2
- 3
- 7
19: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and dipstick
- sight glass, weight, paper method, and frost line.
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and frost line
20: Suction line oil traps should be installed when the condenser is
- on the third floor roof and the evaporator is in the basement
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
- located outside the operates in temperatures below 35F
21: What is considered a cooling agent?
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
- any liquid used for the transmission of heat when condensation occur
22: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 0 psig
- 10 psig
- 5 psig
23: Start to Run windings will have what resistance?
- All will be at equal values
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
- The most resistance value
24: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 550 lbs
- 660 lbs
- 330 lbs.
- 55 lbs