Topics: All categories in the pool
1: At higher altitudes, the boiling point of refrigerant is
- higher
- equal to the coefficient of water at 32F
- lower
- the same
2: If the power element of an expansion valve should lose its charge the valve would
- go open
- underfeed the evaporator
- go closed
- overfeed the evaporator
3: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 330 lbs
- 660 lbs
- 55 lbs
4: Capacitors are rated in
- volt - amperes
- megaohms
- micro-farads
- kelvins
5: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
6: Large mercantile occupancy is
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
7: 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.
- 100
- 80
- 110
- 90
8: What is used to check very low pressure?
- Velometer
- Hygrometer
- Manometer
- Hydrometer
9: How many refrigerant classifications are there for flammability?
- 3
- 7
- 1
- 2
10: 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
11: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- provide space for the accumulation of oil and containminants
- prevent liquid slugs at the compressor
- store liquid refrigerant
12: Relief valves are rated in
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
- pounds of air per hour
13: Heat is a form of
- energy
- work
- matter
- power
14: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 257 psig, 77 psig
- 226 psig, 68 psig
- 455 psig, 185 psig.
- 365 psig, 120 psig
15: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
16: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Cascade
- Low pressure
- Simple
17: 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
- lift voltage
- run voltage
- pick up voltage
- boost voltage
18: How many BTU's is produced by one watt of energy
- 1
- 3.00
- 2.57
- 3.41
19: Which occupancy can ammonia be used in?
- industrial
- commercial
- redifential
- depends on the quantity of freon
20: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
21: When using nitrogen for brazing, the pressure should be:
- Slightly below atmospheric
- Very low
- 50-100 psig
- 125 psig
22: An air conditioning system rated for 36,000 BTU's is equivalent to
- 12,000 tons of cooling
- three tons of cooling
- one ton of cooling
- two tons of cooling
23: 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
24: What refrigerant doesn't have to be classified?
- R-717
- R-422A
- R-718
- R-134A
25: All serviceable components of a refrigeration system shall be provided with
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
- safe access
- service manuals