Topics: All categories in the pool
1: What device should be used on low-temperature freezers?
- high capacity TXV
- discharge muffler
- hot-gas by-pass
- oil separator
2: How many flammability classifications are refrigerants in?
- 7
- 2
- 3
- 5
3: NH3 is
- lithium bromide
- ammonia
- R-508A
- R-718
4: 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
5: A factory-sealed system containing less than 22lbs. of Group A1 refrigerant
- shall have a pressure limiting device installed on the high side of the system
- does not require a pressure-limiting device
- shall have a pressure limiting device and a pressure relief valve installed
- shall be inspected by the Boiler of Inspectors bi-annually
6: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- over pressure protection and a rupture disc
- over pressure protection
- over pressure protection as well as a temperature protection device
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
7: In a properly balanced system with valves open and properly adjusted, if the suction line is warm to the touch, its because of
- not enough oil in the system
- oil in evaporator
- low head pressure
- moisture in the system
8: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
9: 14.7 psia is equivalent to
- atmospheric pressure at seal level
- 29.92" Hg
- 0 psig
- All of the above.
10: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
11: What is the boiling point of refrigerant governed by?
- Condenser sub-cooling
- Compressor RPM's
- P&T relationship
- Evaporator temperature
12: Joints in refrigeration piping must be _____ before being covered?
- Inspected
- Pressurized
- Insulated
- Leak tested
13: What measures gas pressure?
- Manometer
- Hydrometer
- Barometer
- Hygrometer
14: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
15: Which refrigerant replaced R-12?
- R-134A
- R-410A
- R-407A
- R-22
16: Which of the following are considered inorganic refrigerants?
- R-717 and R-718
- 410A and R-407C
- R-500 and R-502
- None of the above
17: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, start
- duel-run, duel-start
- run, common
18: A run capacitor is wired in series with the _____ windings.
- run
- start
- start capacitor
- common
19: On a pumpdown system, the liquid-line solenoid is controlled by the
- thermostat
- low-ambient controller
- low pressure switch
- defrost timer
20: A High-Probablity system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
- is a system highly likely to leak from a failed connection or component of such system
21: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
22: A restaurant is classified as a
- large mercantile occupancy
- mixed occupancy
- public assembly occupancy
- commercial occupancy
23: 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.
- 350
- 400
- 250
- 100
24: All low-pressure chillers use which type of compressor?
- Scroll
- Centrifugal
- Reciprocating
- Rotary
25: Control systems can be classified by
- safety
- source of power
- economy of operation
- tonnage of system