Topics: All categories in the pool
1: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
2: What is the maximum voltage range allowed on an electrical circuit?
- 5%
- 10%
- 20%
- 15%
3: The best way to determine the voltage requirement for an electrical component is to
- determine the capacity of the service panel
- read the voltage with a mulitmeter
- check with the utility company
- read the nameplate data
4: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
5: Excessive head pressure is often caused by
- air cooled condenser is plugged
- thermostat set too high
- insufficient refrigerant
- leaking reed valve on the discharge side
6: How do you find net oil pressure on a compressor?
- discharge pressure - suction pressure
- gross oil pressure - suction pressure
- gross oil pressure - discharge pressure
- all of the above
7: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- Place sign, check for leaks, and insulate suction line
- Make sure its compatible, notify owner, and notify AHJ.
- you can never change refrigerants
- Nothing must be done
8: Transformers are rated in
- volt-amps
- volts-ohms
- volts
- amps
9: "E" references ____ in the Ohm's law formula
- amperage
- resistance
- capacitance
- voltage
10: A relief valve shall be located at least ___ above grade.
- 36'
- 10'
- 25'
- 15'
11: A professional or office building would be considered what type of occupancy?
- public assembly
- commercial
- business
- mercantile
12: What refrigerant doesn't have to be classified?
- R-422A
- R-718
- R-134A
- R-717
13: A moisture indicator must
- be yellow
- be sight side up
- be filled with liquid
- change color when exposed to moisture
14: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
15: 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
- lift voltage
- boost voltage
- pick up voltage
16: Which refrigerant(s) is an HFC?
- R-22
- R-410A
- R-502
- All of the above
17: Copper and its alloys shall not be used with ammonia
- True
- False
18: A room having machinery but no flame producing apparatus permanently installed and operated is considered a
- Class T machinery room
- Class B machinery room
- Class M machinery room
- Class A machinery room
19: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Manometer
- Barometer
- Anemomter
20: Pressure vessels shall be provided with ___________in accordance with Section VIII of the ASME Boiler & Pressure Vessel Code
- Pressure vessels need no type of protection as long as it is hydrostatically tested every three months
- over pressure protection
- over pressure protection as well as a temperature protection device
- over pressure protection and a rupture disc
21: The critical temperature of a refrigerant gas occurs when
- the gas returns to a liquid
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
22: A halide torch is most useful with a freon compression system
- to detect refrigeration leaks in piping joints
- to sweat flanges on the refrigeration piping
- to release a sticking valve
- to remove from from TXV's and evaporator coils
23: Which winding have the most turns?
- depends on the motor phase
- run
- they have equal amount of turns
- Start
24: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 5KW
- 1000 watts
- 600 watts
25: When systems are protected by a high pressure relief device, the compressor's pressure limiting device shall be set at or below ____ % of the operating pressure of the high side relief device.
- 100
- 80
- 90
- 110