Topics: All categories in the pool
1: Which creates more of a heat load?
- 70% RH
- 50% RH
- 90% RH
- 30% RH
2: Pi equals approximately
- 12,000
- 746
- 3.41
- 3.14
3: Pressure vessels with an internal volume of 3 cubic feet or more
- shall use fusible plugs
- do not need pressure relief protection
- shall use pressure relief devices
- shall use pressure relief devices or fusible plugs
4: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic but non-flammable
- toxic and highly flammable
5: Machinery rooms must be vented to ______?
- outdoors
- neutralizing tank
- unoccupied spaces
- basement
6: What refrigerant were phased out in 2004?
- R-22
- R-11
- R-134a
- R-12
7: The purpose of an accumulator is to
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver
- assure no liquid returns to the compressor
- filter out impurities from the system
8: Refrigerant is metered into the evaporator on a large centrifugal chiller thru the
- low side of the system
- high side float assembly
- cap tube
- none of the above
9: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
10: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
11: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Moisture indicator
- Stop valve
- Muffler
- Foot valve
12: R-717 is
- trichloromethane
- water
- ammonia
- carbon dioxide
13: How many refrigerant classifications are there for flammability?
- 2
- 7
- 3
- 1
14: A declaration test is needed when the system contains more than
- 65 lbs
- 55 lbs
- 110 lbs
- 120 lbs
15: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low head pressure and high suction pressure
- Low suction pressure and low discharge pressure
- High suction pressure and high discharge pressure.
- High head pressure and low suction pressure
16: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
- 15 square feet or less
17: Relief valves are rated in
- pounds of air per hour
- gallons of water per minute
- gallons of water per hour
- pounds of air per minute
18: Low ambient controls are used when
- always
- economizers are used
- on air conditioning systems only
- when systems run all year round
19: The rupture disc on a low-pressure chiller typically releases pressure at
- 15 psig
- 5 psig
- 0 psig
- 10 psig
20: An azeotropic refrigerant is
- a mixture of two or more refrigerants that boil at about the same temperature minimizing temperature glide.
- a mixture of two or more refrigerants that boil at much different temperatures causing temperature glide
- a mixture of two or more refrigerants that boil at much different temperatures minimizing temperature glide
- none of the above
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: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
- the gas is no longer saturated
- any decrease in pressure will cause condensation
23: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Uniforms, checks, and invoices.
- Trucks, license plates, and uniforms
- Truck, office, every job, and on all equipment
24: If the spring is adjusted to increase the superheat, this new setting will
- allow more liquid into the evaporator
- shorten the frost line
- lengthen the frost line
- have no effect on the frost line
25: An accumulator can be located between the
- evaporator and compressor
- first stage and second stage compressors
- condenser and evaporator
- compressor and condenser