Topics: All categories in the pool
1: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.7
- .1
- 1.2
- .8
2: What does an anemometer measure?
- amperage
- velocity
- temperature
- voltage
3: What type of copper is not permitted on refrigeration systems?
- Type M
- Type L
- Type K
- Type N
4: The oil separator is always inserted in the system
- where it can be easily serviced
- in the discharge line
- in a cool spot
- to prevent oil logging
5: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- designed head pressure
- type of refrigerant
6: On a single phase motor, when does the start winding cut out?
- At 50% of its full rated speed
- At 75% of its full rated speed
- At 25% of its full rated speed
- Start windings do no cut-out of the run cycle
7: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
8: 1 HP = ____ Watts?
- 3.1416
- 11,239
- 746
- 3,412
9: _____ and its alloys are suitable for use with ammonia systems.
- Copper
- Magnesium
- Aluminum
- Zinc
10: Which refrigerant replaced R-12?
- R-407A
- R-22
- R-134A
- R-410A
11: Pressure vessels with an internal volume of 3 cubic feet or less
- shall use pressure relief devices or fusible plugs
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices
12: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- There is no minimum for relief valve and windows.
- At least 30'
- At least 40'
13: The low pressure oil safety switch
- resets itself after the time delay has terminated
- must be reset manually
- never trips
- resets itself automatically
14: Each machinery room shall contain
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- high and low pressure controls
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
15: A class B1 refrigerant is considered
- toxic and somewhat flammable
- non-toxic but highly flammable
- non-toxic and non-flammable
- toxic but non-flammable
16: A declaration test is needed when the system contains more than
- 55 lbs
- 110 lbs
- 65 lbs
- 120 lbs
17: What must be done to refrigerant pipes before being buried?
- Coated
- Certified
- Encased
- Leaked checked
18: What device measures the specific gravity of a substance?
- Hygrometer
- Thermometer
- Hydrometer
- Manometer
19: Refrigerant restricted in 2004 but used for transition for decades:
- R-123
- R-22
- R-134A
- R-11
20: The critical temperature of a refrigerant gas occurs when
- the gas returns to a liquid
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
21: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is where the refrigerant comes in contact with the space refrigerated
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
22: "I" represents _______ in the Watt's law formula.
- reactance
- watts
- amperage
- voltage
23: 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.
- 55
- 50
- 15
- 75
24: All serviceable components of a refrigeration system shall be provided with
- safe access
- manufactures instructions on start-up procedures
- service manuals
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
25: How would you know if there was a loss of crankcase pressure?
- oil will thin out
- oil will thicken
- oil level will rise
- oil will foam