Topics: All categories in the pool
1: What is a megaohm meter?
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
2: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- a pressure relief device
- either a fusible plug or a pressure relief device
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
3: 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
4: When is the space above a drop ceiling calculated as space for refrigerant limit quantities?
- When its white
- When there are sprinklers above
- When there is a space 6' or more above it
- When it's used as part of a supply or return air system
5: When the compressor is below the condensor
- traps are not needed on this type of system
- traps are needed on the suction line
- traps are needed on the discharge line
- traps are needed on the oil return line
6: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
7: When a refrigerating machinery room is used, the emergency procedures shall be posted
- outside the room, immediately adjacent to each door
- inside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
8: A tachometer is an instrument used to measure
- speed
- air velocity
- static pressure
- RPM
9: B3 refrigerants are considered
- non-toxic but non-flammable
- non-toxic but flammable
- toxic and highly flammable
- toxic but non-flammable
10: Humidity can be sensed with
- human hair
- pressure bellows
- thermometer
- bimetal
11: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
12: If the compression ratio on a centrifugal compressor rises too high, the compressor will stop pumping and make a loud sound commonly referred to as a
- purge
- surge
- splurge
- merge
13: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 208v
- 120v
- 240v
- 277v
14: 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
15: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
16: Dual-pressure relief devices should be installed on
- vessels of 10 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 3 cubic feet or more
- vessels of 10 cubic feet or less
17: Which refrigerant class listed below is the most flammable?
- A3
- B2
- A2
- C3
18: No open flames are allowed in the machinery room unless?
- Approved by the installing contractor
- Never can be allowed
- Only when combustion air is provided from outside of the machinery room
- Approved by the authorized person
19: Institutional occupancy is
- a premise or that portion of a premise where large numbers of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise from which, because they are disabled, debilitated, or confined, occupants cannot readily leave without the assistance of others.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- None of the above
20: Capacity control on a centrifugal compressor is accomplished by the
- post-rotational guide vanes
- slide vanes
- pre-rotational guide vanes
- check valves
21: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Encased
- Coated
- Certified
22: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
23: The best way to detect ammonia in brine is
- potassium of line
- nessler regaent
- CO2 gas
- carbonation of soda
24: Heat is a form of
- power
- energy
- matter
- work
25: While the system is operating, the discharge line should be
- too hot to hold by hand
- at the same temperature as the crankcase
- 10-15F warmer than ambient
- room temperature