Topics: All categories in the pool
1: Who authorizes changes to the safety codes?
- Contractor who last serviced the system.
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
2: The evaporator is a device to
- remove heat from the refrigeration system
- absorb heat into the refrigeration system
- store liquid refrigerant
- Keep the compressor busy
3: 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
4: Refrigerants shall be classified by
- toxicity and flammability
- color codes
- maximum permissible quantities of each group
- requirements for commercial, industrial, and residential occupancies
5: A movie theater would be considered a
- mixed occupancy
- commercial occupancy
- public assembly occupancy
- institutional occupancy
6: How many refrigerant classifications are there for toxicity?
- 3
- 1
- 2
- 5
7: Liquid refrigerant R-22 enters an evaporator at 50.2 psig, 20F and leaves 37F, its pressure as it leaves will be
- 50.2 psig
- 70.8 psig
- 43.3 psig
- 66.1 psig
8: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Nothing must be done
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
9: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
- Watts = volts X amps
10: The color code of a tank of ammonia is
- white
- light green
- lavender
- silver
11: The low pressure oil safety switch
- must be reset manually
- never trips
- resets itself after the time delay has terminated
- resets itself automatically
12: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
13: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- refrigerant control
- capacity control
14: Joints in refrigeration piping must be _____ before being covered?
- Pressurized
- Inspected
- Insulated
- Leak tested
15: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 90
- 100
- 80
- 110
16: 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
17: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class M machinery room
- Class A machinery room
18: Viscosity is
- the coefficient of external friction
- a measure of heat content
- the ability of oil to flow
- measure of weight
19: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
20: If a liquid receiver is designed to receive the refrigerant charge during a pumpdown procedure, it shall have the capacity to
- release the charge when the pressure exceeds 310 psig or higher
- receive the pumpdown charge
- hold up to 110% of the pumpdown charge
- Pumpdown procedures are not allowed with systems containing liquid recievers
21: A thermometer inside a duct measures ____ heat.
- sensible
- latent
- specific
- hidden
22: Cooling tower lowers condenser water temp by
- condensation
- running fans at 100%
- evaporative cooling
- running water thru a secondary heat exchanger
23: A class B1 refrigerant is considered
- toxic but non-flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic and somewhat flammable
24: What is the state of the refrigerant leaving the evaporator?
- a low temperature subcooled liquid
- a high temperature superheated vapor
- a high temperature subcooled liquid
- low temperature superheated vapor
25: Trichlorofluoromethane is the name of what refrigerant?
- R-113
- R-502
- R-12
- R-11