Topics: All categories in the pool
1: Liquid level gauges must be provided with what?
- A red line
- A relief valve
- A low level mark
- Automatic shut-offs
2: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- lower
- there is no Group B1 refrigerants
- the same
3: On cooling towers, what causes the condenser water to drop
- tower fans
- ambient temperatures
- evaporation of the water droplets
- sensible heat
4: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- pick-up voltage
- lift voltage
- run voltage
- boost voltage
5: A motor starter contains a thermal overload and a
- solenoid
- transformer
- 3-way relay
- contactor
6: The 4 basic methods of determining whether the proper amount of refrigerant is being introduced into the system are
- sight glass, weight, pressure, and frost line
- Buss-eye, weight, pressure, and frost line
- sight glass, weight, pressure, and dipstick
- sight glass, weight, paper method, and frost line.
7: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 9.00'
- 8'4"
- 7.25'
- 7.00'
8: Machinery rooms must be vented to ______?
- neutralizing tank
- basement
- outdoors
- unoccupied spaces
9: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
10: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- lengthen the frost line
- shorten the frost line
- allow more liquid into the evaporator
11: What is an egress?
- An escape route
- An entrance or exit
- A valve put on the low side of the system to prevent frosting
- A code violation
12: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
13: An electronic bridge circuit is basically a
- 24 volt control circuit
- suspension
- Wheatstone
- high voltage circuit
14: The formula for Pure Power in a resistance circuit is
- Watts X power factor
- Kw = volts X amps
- Watts X amps.
- Watts = volts X amps
15: The absorber shell contains the
- evaporator and the absorber
- condenser and the absorber
- condenser and the generator
- condenser, the evaporator, and the generator
16: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
17: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
18: 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
19: Low pressure chiller systems use what type of compressor?
- Screw
- Reciprocating
- Scroll
- Centrifugal
20: R-11 belongs to Group
- B-1
- B-3
- A-1
- A-2
21: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- Low side float
- TXV
- High side float
22: Viscosity is
- a measure of heat content
- measure of weight
- the coefficient of external friction
- the ability of oil to flow
23: What type of pressure relief device is used on a CO2 system?
- Glove valve
- Fusible plug
- Gate valve
- Rupture disk
24: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- 2.5 times the design pressure
- the aggregate of the high side and low side
- the high side
- the low side
25: Transformers are rated in
- volts
- volt-amps
- amps
- volts-ohms