Topics: All categories in the pool
1: The proper location for an oil separator is between the
- compressor and condenser
- receiver and metering device
- condenser and receiver
- evaporator and compressor
2: Machinery rooms shall be vented to _____________ and utilizing mechanical ventilation.
- the return air ducted system
- the outdoors
- Machinery rooms need not be vented
- the mechanical room housing the refrigeration system
3: Ammonia vaporization takes place at what temperature?
- -460F
- -110F
- -32F
- -28F
4: A Lithium-bromide system is an absorption system that
- uses salts as an absorbent and lithium bromide as a refrigerant
- uses water as a refrigerant and lithium bromide as an absorbent
- uses ammonia as a refrigerant and lithium bromide as an absorbent
- uses water as a absorbent and lithium bromide as a refrigerant
5: An electrical circuit has a 208V power supply and draws 47 amps total, What would be the wattage of the circuit
- 977.6 watts
- .9776 watts
- 9.776 watts
- 9,776 watts
6: Dual-pressure relief devices should be installed on
- vessels of 3 cubic feet or more
- vessels of 3 cubic feet or less
- vessels of 10 cubic feet or more
- vessels of 10 cubic feet or less
7: What is used to check very low pressure?
- Manometer
- Velometer
- Hygrometer
- Hydrometer
8: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
9: What measures gas pressure?
- Hydrometer
- Hygrometer
- Barometer
- Manometer
10: The first step in mechanical refrigeration is
- expansion
- condensation
- compression
- evaporation
11: What does an anemometer measure?
- amperage
- velocity
- voltage
- temperature
12: Usually dry bulb temperature is
- same as wet bulb temperature
- higher than wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
13: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 27 ohms
- 104 ohms
- 71 ohms
- 80 ohms
14: Defined process piping by code CMR (528)
- Any piping that conveys a solid, liquid or gas that is not part of the plumbing or fire protection system
- Any piping in an industrial space
- Any piping in an industrial or commercial space
- All of the above
15: Evaporators within 18" of a heating coil must be equipped with a
- pressure relief device
- zone valve
- low limit control
- high limit control
16: The maximum permissible amperage draw for a 40VA transfomer with a secondary voltage of 24V is
- 1.2
- .8
- .1
- 1.7
17: The Department that certifies the transportation of refrigerant is the
- EPO
- RSES
- EPA
- DOT
18: Adjusting the spring pressure on a TXV
- changes superheat
- changes subcooling
- adjusts the bulb charge
- makes no difference
19: The reversing valve is commonly used
- on commercial system that involve two different temperatures
- when the code requires a check valve
- on multiple compressor systems
- on all heat pumps
20: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
21: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
22: Which winding have the most turns?
- they have equal amount of turns
- run
- depends on the motor phase
- Start
23: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- MSCA Code
- Montreal Protocol Safety Code
- the 1997 ANSI/ASHRAE Safety Code
24: NH3 is
- ammonia
- R-718
- R-508A
- lithium bromide
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 55 lbs
- 330 lbs
- 660 lbs
- 500 lbs