Topics: All categories in the pool
1: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with R-718
- Flush with RX-11
- Flush with ammonia
- Flush with R-11
2: A High-Probablity system
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak from a failed connection or component of such system
3: 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 high side
- the low side
- 2.5 times the design pressure
- the aggregate of the high side and low side
4: Total heat of a substance is considered
- specific heat
- enthalpy
- empathetical
- sensible heat
5: What is used to check very low pressure?
- Hygrometer
- Manometer
- Velometer
- Hydrometer
6: The most common type of motor starter is
- duel-winding starter
- across the line starter
- delts-wye starter
- part winding starter
7: What is the purpose of a surge capacitor on a contactor?
- to keep the contactor pulled in
- to protect low voltage equipment
- to provide smoother start/stops
- to balance the sine waves
8: Liquid level gauges must be provided with what?
- A low level mark
- A red line
- A relief valve
- Automatic shut-offs
9: When should a relief valve start to function?
- 10 psi before it's set pressure
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
10: Secondary refrigerants are usually
- alcohol
- expensive
- water or brine
- Prestone anti-freeze
11: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
12: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
13: How many BTU's is produced by one watt of energy
- 2.57
- 3.41
- 3.00
- 1
14: A multi-evaporator refrigeration system uses what type of valve to maintain evaporating temperatures?
- Solenoid valve
- EPR valve
- EEV
- CPR valve
15: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
16: On cooling towers, what causes the condenser water to drop
- tower fans
- sensible heat
- evaporation of the water droplets
- ambient temperatures
17: Booster compressors, pump refrigerant into the
- high side of the secondary compressor
- receiver
- heat & plate heat exchanges
- low side of the primary compressor
18: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- hold up to 110% of the pumpdown charge
- receive the pumpdown charge
- release the charge when the pressure exceeds 310 psig or higher
- Pumpdown procedures are not allowed with systems containing liquid recievers
19: Sensible heat is the heat added to a substance to
- raise its temperature
- change its state
- freeze it
- cause evaporation
20: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 15 uf
- 20 uf
- 40 uf
- 25 uf
21: Field Inspections of refrigeration and A/C systems in Massachusetts shall be made by
- District Engineering Inspectors
- Commissioned Inspectors
- Master licensed Technician
- both a or b
22: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 50
- 15
- 55
23: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- 9,776 watts
- .9776 watts
- 9.776 watts
24: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
25: A moisture indicator must
- be filled with liquid
- change color when exposed to moisture
- be yellow
- be sight side up