Topics: All categories in the pool
1: A low oil switch is typically
- automatic reset
- manual reset
- time-delay auto reset
- non used on semi-hermetic compressors over 10 ton capacity
2: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
- is a reciprocating type compressor with 2 or more pistons
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
3: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
4: A mercury bulb controller is not recommended for
- line or low voltage use
- line voltage use
- use where vibration is severe
- low voltage use
5: Pressure is equivalent of
- Force
- Force / Area
- Area X Force
- Force X Area
6: 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
7: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
8: The instrument used to measure the specific gravity of absorption chiller solutions is the
- anemometer
- refractometer
- Psychrometer
- hydrometer
9: While the system is operating, the discharge line should be
- too hot to hold by hand
- 10-15F warmer than ambient
- at the same temperature as the crankcase
- room temperature
10: When energized, a normally open relay will be
- noisy
- depends on the type and class of the relay
- open
- closed
11: If the power element of an expansion valve should lose its charge the valve would
- go open
- underfeed the evaporator
- go closed
- overfeed the evaporator
12: Which refrigerant class listed below is the most flammable?
- C3
- A2
- B2
- A3
13: 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
14: A capacitor in series with the start windings will do what?
- Increase starting torque
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase run efficiency by 10% of its rating
15: What type of voltage cause a potential relay to open?
- 24 volt supply from the thermostat
- 120 volt line voltage
- Pick-up voltage
- none of the above
16: 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.
17: Pressure vessels with an internal volume of 10 cubic feet or more
- shall use pressure relief devices or fusible plugs
- shall use rupture discs or duel pressure relief valves
- shall use fusible plugs
- shall use pressure relief devices
18: Class A refrigerants are considered
- toxic
- non-flammable
- non-toxic
- flammable
19: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- on top of the condensor
- between the compressor and oil separator
- between the compressor and reciever
20: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- opening at the pump inlet
- cooling temperature set-point
- opening at the pump outlet
- adjustment of the spring tension of the TXV
21: The density of a gas refers to
- cubic feet per pound
- pounds per absolute pressure
- pounds per cubic foot
- pounds per square foot
22: A “U” or “UM” marking a on a nameplate of a pressure vessels signifies compliance with Section VIII of
- the ASME Boiler and Pressure Vessel Code
- Section 11.3.1.5 ASHRAE 15 Standard
- the ANSI Standard 10.7.2
- both the ANSI Standard 10.7.2 and ASHRAE 15 Standard 11.3.1.5
23: The oil separator is always inserted in the system
- where it can be easily serviced
- to prevent oil logging
- in a cool spot
- in the discharge line
24: How are refrigerant blends classified?
- Based on best case Fractionation
- Based on worst case fractionation
- Blends don't have to be classified
- Based on the oil used
25: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.