Topics: All categories in the pool
1: A machine room with a refrigerant system using ammonia shall
- be provided with a continuously operated ventilation system
- be considered a non-hazardous location in accordance with National Electrical code
- have no flame producing apparatus permanently installed and operated
- All of the above
2: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
3: What type of refrigerants are NOT flammable?
- CHC
- HFC
- HCFC
- All of the above
4: Absolute pressure is
- Gauge Pressure
- Atmospheric Pressure
- Gauge + Atmospheric Pressure + Pi
- none of the above
5: What would be the classification of a prison?
- Large mercantile
- Institutional
- Industrial
- Place of assembly
6: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
7: How are safety controls wired in a circuit?
- Parallel
- Either series or parallel
- Series
- Series/parallel
8: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-2
- B-2
- A-1
- B-1
9: R-410A can segregate in the system or chemically change its composition due to a leak.
- True
- False
10: NH3 is
- R-508A
- lithium bromide
- R-718
- ammonia
11: A cross charged power element on an expansion valve would normally be used in what temperature range?
- 30F to 50F
- 0F-38F
- -100F to -40F
- -40F to 0F
12: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
13: A high side float is a
- float type valve that controls the amount of refrigerant stored in the receiver
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type switch that stops the compressor when the pressure on the high side becomes too high
- float type valve that controls the crankcase oil level
14: 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.
15: High pressure controls should be set no higher than
- 10% of set point
- 25% of set point
- 80% of set point
- 90% of set point
16: When a refrigeration or air conditioning system is installed
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- the form of certificate shall be authorized by the Department of Pubic safety
- it shall not be operated below prescribed pressures
17: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIA
- PSIG
- temperature minus pounds of air per second divided by release rate squared
18: A moisture indicator must
- change color when exposed to moisture
- be yellow
- be filled with liquid
- be sight side up
19: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- high head pressure
- increased capacity
- low suction pressure
20: 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 refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
21: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
22: The main cause of enacting the "no vending rule" of July 1st 1992 was
- global warming potential
- ozone depletion
- both a & b
- None of the above
23: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High head pressure and low suction pressure
- Low head pressure and high suction pressure
- High suction pressure and high discharge pressure.
- Low suction pressure and low discharge pressure
24: Evaporators located ____inches of a heating coil shall be equipped whit a pressure relief device.
- 10
- 18
- 15
- 24
25: The absorber shell contains the
- evaporator and the absorber
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator