Topics: All categories in the pool
1: What type of material can't be used on the outlet of a relief valve?
- Stainless steel
- PVC
- Copper
- Magnesium alloy
2: A relief valve discharge capacity is rated in
- PSIG
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
3: Which of the following is NOT a positive displacement compressor?
- scroll
- reciprocating
- centrifugal
- screw
4: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Uniforms, checks, and invoices.
5: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
6: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 80%
- 90%
- 100%
- 75%
7: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- A-2
- B-2
8: Which of the following is not an air velocity meter?
- Velometer
- Hydrometer
- Anemometer
- Anemotherm
9: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
10: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any refrigerant direcly in contact with the cooling space for process cooling
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
11: Sensible heat is the heat added to a substance to
- cause evaporation
- raise its temperature
- freeze it
- change its state
12: Where would the EPR valve be located on a multiple evaporator system?
- inlet of the low temperature evaporator.
- outlet of high temperature evaporator
- outlet of low temperature evaporator
- outlet of the liquid line
13: The principle used in continuous type absorption systems is
- Charles's Law
- Boyle's Law
- Ohm's Law
- Dalton's Law
14: When must refrigeration system covered by the code be inspected?
- Annually
- Upon installation
- Not required
- Annually and when installed
15: 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
16: Aluminum, Zinc, Magnesium, or their alloys shall not be used in contact with
- trichlorotrifluoromethane
- methyl chloride
- ammonia
- R-718
17: 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.
- 400
- 350
- 250
- 100
18: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
19: High side floats are used on centrifugal chiller systems are are considered critically charged systems.
- are obsolete.
- depends on the type of refrigerant being used
- True
- False
20: Ammonia belongs to Group
- A-1
- A-2
- B-1
- B-2
21: In a system designed for sub-zero ambient temperatures, what must be added?
- Infrared dye for leak identification
- Low-ambient kit
- Nitrogen
- Booster compressor
22: The density of a gas refers to
- pounds per square foot
- pounds per cubic foot
- cubic feet per pound
- pounds per absolute pressure
23: How is bring measured?
- hydrometer
- manometer
- hygrometer
- anemometer
24: All machine rooms must be outfitted with a detector that _______?
- activates an audible alarm
- activates a visual alarm
- starts the ventilation system
- All of the above
25: In a motor, an internal overload might open if
- there's a direct short
- there's an excess current draw through the motor
- there's an open start winding
- there was a high pressure refrigerant was used for a low pressure system.