Topics: All categories in the pool
1: It shall be the duty of the person in charge of the premises on which a refrigeration system containing more than ___ lbs of refrigerant is installed to provide a schematic drawing or panel giving directions for the operation of the system.
- 75
- 15
- 50
- 55
2: "E" references ____ in the Ohm's law formula
- amperage
- capacitance
- voltage
- resistance
3: If the spring is adjusted to increase the superheat, this new setting will
- have no effect on the frost line
- allow more liquid into the evaporator
- shorten the frost line
- lengthen the frost line
4: 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
- 110
- 80
5: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- low side of the system
- the vapor side of the system
- the liquid side of the system
- high side of the system
6: A professional or office building would be considered what type of occupancy?
- commercial
- mercantile
- business
- public assembly
7: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusible plug
- rupture plug
- fusion plug
8: 1 Watt = ______ BTU's?
- 7.216
- 3.412
- 12
- 4.482
9: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- diluted solution
- strong solution
- weak solution
10: Which of the following controllers would you expect to be most sensitive to temperature changes?
- aquastat
- immersion controller
- line voltage t-stat
- low voltage t-stat
11: It takes how many BTU/hr to melt one pound of ice at 32F
- 144
- 212
- 970
- 180
12: 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
13: What is the minimum size of the discharge pipe?
- Same size as the outlet of the relief valve
- One pipe size larger that the inlet of the relief valve
- Depends on size of manifold
- All of the above
14: Name an HCFC refrigerant(s):
- R-22
- R-123
- R-11
- both a & b
15: The low pressure oil safety switch
- resets itself after the time delay has terminated
- must be reset manually
- never trips
- resets itself automatically
16: A self contained system
- is a unit system Group II refrigerants only
- is a complete factory made and tested system
- is any system or part of a system used to increase evaporation by expansion or vaporization
- is a unit system Group I refrigerants only
17: The purpose of an accumulator is to
- assure no liquid returns to the compressor
- reduce friction loss to the flow of refrigerant
- store excess refrigerant from the reciver
- filter out impurities from the system
18: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- force of pressure above that of atmospheric
- atmospheric pressure
- absolute pressure
19: Mercury was used in thermometers primarily because it
- was inexpensive
- never freezes
- vaporizes at very high temperatures
- expands uniformly
20: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
21: All low-pressure chillers use which type of compressor?
- Reciprocating
- Rotary
- Centrifugal
- Scroll
22: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
23: Which refrigerant class listed below is the most flammable?
- C-3
- A-3
- A-1
- B-2
24: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
25: What is Trichlorotrifluoromethane?
- R-113
- R-13
- R-11
- R-12