Topics: All categories in the pool
1: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
- At 50% of its full rated speed
- At 75% of its full rated speed
2: When an A/C system is excessively low on refrigerant
- it can become contaminated with water
- there can be nuisance trip outs
- the suction line may be too hot to touch
- All of the above
3: If the power element on an expansion valve should lose its charge, the valve would
- Under feed
- Over feed
- Close
- Stay open
4: How far from the ground does a relief valve need to be?
- At least 25' above grade
- At least 20' above grade
- Not more than 3' above grade
- At least 15' above grade
5: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
6: 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.
7: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
8: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
9: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 7.25'
- 72"
- Ceiling height
10: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- nothing must be done
- place sign, check for leaks, insulate
11: Materials used in construction and installation materials used in the manufacture or installation of refrigerating equipment shall be suitable for conveying refrigerant and the refrigerant oils and will not deteriorate in the presence of what?
- Air and dirt
- Moisture and air
- Water and soap
- Oil and water
12: What would be the classification for Stop & Shop grocery store?
- Industrial
- Instituional
- Place of assembly
- Large mercantile
13: In an A/C unit, dirty filters will cause
- low oil pressure
- low suction pressure
- high discharge pressure
- high suction pressur
14: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- specific heat
- sensible heat
- lost heat
- latent heat
15: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
16: Pressure vessels having an inside diameter of 6” or less shall be protected by
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- either a fusible plug or a pressure relief device
- a pressure relief device
17: How are a compressor and condenser fan wired?
- parallel-series
- parallel
- series-parallel
- series
18: A 24 volt transformer with a 240 volt primary can handle how many amps?
- 24 amps
- 20 amps
- There isn't enough information to answer.
- 10 amps
19: A thermometer inside a duct measures ____ heat.
- latent
- hidden
- sensible
- specific
20: What is the refrigerant chlorodifluoromethane?
- R-22
- R-123
- R-134a
- R-12
21: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 158F
- 32F
- 155F
- 45F
22: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
23: The Board of Boilers adopts by reference
- MSCA Code
- Montreal Protocol Safety Code
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
24: A professional or office building would be considered what type of occupancy?
- business
- mercantile
- commercial
- public assembly
25: Emergency shutdown procedures, including precautions to be observed in case of a breakdown or leak over 55 lbs of refrigerant charge, shall be displayed on a conspicuous card located as near as possible to the
- evaporator
- compressor
- outside the machinery room
- boiler