Topics: All categories in the pool
1: 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
- low suction pressure
- increased capacity
2: Gauge pressure is
- Barometric pressure
- Force of pressure above that of atmosphere
- Absolute pressrue
- Atmospheric pressure
3: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Relief valve
- Temperature limiter device
- T&P device
- Circuit Breaker
4: A pressure vessel having an inside diameter of 6” or less shall be sufficient to withstand ____times the pressure of the saturation temperature of the refrigerant or ____times the critical pressure of the refrigerant, whichever is less.
- 6.6, 6.6
- 2.5, 3.0
- 3.0, 3.5
- 2.5, 2.5
5: Which refrigerant class listed below is the most flammable?
- B2
- A3
- A2
- C3
6: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
7: When an inspection is needed, how often must it be done?
- every 18 months
- every 36 months
- annually
- every 24 months
8: "P" represents ______ in the Watt's law formula
- voltage
- reactance
- watts
- amperage
9: In an electrical circuit, what is potential measured in?
- Amps
- Ohms
- Volts
- Herys
10: High pressure controls should be set no higher than
- 80% of set point
- 25% of set point
- 10% of set point
- 90% of set point
11: After setting up a forward curved fan for the desired conditions, something happened to lower the total static pressure the fan had to operate against. Which would occur?
- CFM and HP decrease
- CFM and HP increase
- RPM and CFM increase
- CFM and RPM decrease
12: What is the state of the refrigerant leaving the evaporator?
- a high temperature subcooled liquid
- a high temperature superheated vapor
- a low temperature subcooled liquid
- low temperature superheated vapor
13: What must be done to refrigerant pipes before being buried?
- Certified
- Leaked checked
- Encased
- Coated
14: "I" represents _______ in the Watt's law formula.
- reactance
- watts
- amperage
- voltage
15: "R" represents ___ in the Ohm's law formula
- voltage
- resistance
- amperage
- capacitance
16: What would be the classification for Stop & Shop grocery store?
- Industrial
- Large mercantile
- Instituional
- Place of assembly
17: The discharge relief valve is located (9.4.6)
- on top of the condensor
- between the compressor and oil separator
- between the compressor and the stop valve
- between the compressor and reciever
18: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
19: Machinery rooms must be vented to ______?
- neutralizing tank
- outdoors
- unoccupied spaces
- basement
20: The Department that certifies the transportation of refrigerant is the
- RSES
- DOT
- EPA
- EPO
21: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-volumetric displacement compressor
- non-positive displacement compressor
- negative displacement compressor
- neutral chamber-type compressor
22: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
23: Where is an EPR valve located on a multi-evaporator system?
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the warmest evaporator
- Suction line of the coolest evaporator
24: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- capacitance
- amperage
25: Cooling tower lowers condenser water temp by
- evaporative cooling
- running fans at 100%
- condensation
- running water thru a secondary heat exchanger