Topics: All categories in the pool
1: Volts x amps equals
- Inductance
- Ohms Law
- Watts
- Impedance
2: Industrial occupancy is
- a premise or that portion of a premise that is not open to the public, where access by authorized persons is controlled, and that is used to manufacture, process, or store goods, such as chemicals, food, ice, meat, or petroleum.
- is a premise or that portion of a premise where large number of people congregate and from which occupants cannot quickly vacate the space.
- a premise or that portion of a premise where people transact business, receive personal service, or purchase food and other goods.
- Both a and b are correct
3: 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
4: E = I X R is
- Watts Law
- Amps Law
- Impedance Law
- Ohms Law
5: Horizontal piping should be run level.
- False
- Yes, if the condenser is located above the evaporator
- No, unless the supervisor on the job says so.
- True
6: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
7: Capacity control on a centrifugal compressor is accomplished by the
- check valves
- pre-rotational guide vanes
- slide vanes
- post-rotational guide vanes
8: When should a relief valve start to function?
- 10 psi before it's set pressure
- At it's set pressure
- Two times it's working pressure
- Before the purge station discharges
9: What device measures the specific gravity of a substance?
- Hydrometer
- Manometer
- Hygrometer
- Thermometer
10: What is a high-side float?
- Located in the liquid line entering the evaporator, so when the refrigerant level is higher in the liquid line than the evaporator, the float rises to allow more refrigerant flow into the evaporator
- Located in the liquid line entering the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the high side of the chiller
- An electronic-type metering device that contains a float assembly within the device which can accurately meter refrigerant into the evaporator as the load varies
- Located in the evaporator, is a float-type metering device that rises to reduce refrigerant flow when the liquid refrigerant level rises in the low side of the chiller
11: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- There isn't enough information to answer.
- 2
- 1250
- 2.5
12: A mercury bulb controller is not recommended for
- line or low voltage use
- line voltage use
- low voltage use
- use where vibration is severe
13: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
14: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- 2F difference
- a ling psychrometer doesn't have two theremometers.
- far apart or greater difference
- nearly the same
15: The difference between saturated liquid and saturated vapor is
- volume
- temperature
- heat
- pressure
16: Start to Run windings will have what resistance?
- The most resistance value
- The least resistance value
- Somewhere between the actual start winding and run winding resistance value
- All will be at equal values
17: The certificate of inspection
- shall be posted and protected from dirt, water, and other elements
- shall be authorized by a notarized insurance company
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be posted on the compressor shell or electrical panel at the unit
18: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 104 ohms
- 71 ohms
- 80 ohms
- 27 ohms
19: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- nothing must be done
20: In a system designed for sub-zero ambient temperatures, what must be added?
- Nitrogen
- Low-ambient kit
- Booster compressor
- Infrared dye for leak identification
21: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 208v
- 120v
- 277v
- 240v
22: A relief valve discharge capacity is rated in
- Pounds of air per minute.
- PSIG
- PSIA
- temperature minus pounds of air per second divided by release rate squared
23: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
- the gas is no longer saturated
- any decrease in pressure will cause condensation
24: When the compressor is below the condensor
- traps are needed on the oil return line
- traps are needed on the discharge line
- traps are not needed on this type of system
- traps are needed on the suction line
25: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 50
- 550
- 350