Topics: All categories in the pool
1: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- run voltage
- pick up voltage
- lift voltage
- boost voltage
2: All low-pressure chillers use which type of compressor?
- Centrifugal
- Scroll
- Reciprocating
- Rotary
3: Watt's Law indicates Volts X Amps = _________.
- Current
- Ohms
- Watts
- Resistance
4: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- gate or globe valves
- ball valves
- king valves
- companion or block valves
5: A capacitor in series with the start windings will do what?
- Nothing
- Decrease the RLA to within 10% of its rating
- Increase starting torque
- Increase run efficiency by 10% of its rating
6: On a large centrifugal system, what meters the flow to the evaporator?
- Cap tube.
- High side float
- Low side float
- TXV
7: Which of the following is an inorganic refrigerant?
- R-22
- Ammonia
- Chlorofluorocarbons
- All of the above
8: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
9: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above
10: R-22 is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-2
- A-2
- B-1
11: What would be the classification of a church?
- Place of assembly
- Institutional
- Large mercantile
- Industrial
12: How many opening forces operate a thermostatic expansion valve?
- 4
- 2
- 1
- 3
13: In a horizontal shell & tube condenser, the ammonia is liquefied by
- passing thru the tubes from top to bottom
- removing the latent heat of fusion
- removing the latent heat of vaporization
- water sprayed over condenser
14: Class 3 refrigerants are
- non-toxic
- toxic
- non-flammable
- highly flammable
15: The certificate of inspection
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
- shall be posted and protected from dirt, water, and other elements
- shall be $20 and an additional fee of $1 for each tone above 20 tons
16: Which of the following is not an air velocity meter?
- Anemotherm
- Velometer
- Anemometer
- Hydrometer
17: On a ammonia compressor, the pressure of a forced fed oil pump is changed by varying the
- cooling temperature set-point
- adjustment of the spring tension of the TXV
- opening at the pump inlet
- opening at the pump outlet
18: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
19: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
20: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 1000 watts
- 600 watts
- 746 watts
- 5KW
21: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- motor starter
- centrifugal switch
- printed circuit board (PCB)
- duel-voltage switch
22: The density of a gas refers to
- pounds per absolute pressure
- pounds per square foot
- cubic feet per pound
- pounds per cubic foot
23: RPM's of a centrifugal compressor are at approximately?
- 500
- 10,000
- 15,000
- 30,000
24: Which oil is hydoscopic?
- animal
- SW30
- polyolester
- mineral
25: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 500 lbs
- 660 lbs
- 55 lbs
- 330 lbs