Topics: All categories in the pool
1: How are safety controls wired in a circuit?
- Parallel
- Either series or parallel
- Series
- Series/parallel
2: 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 and a rupture disc
- over pressure protection as well as a temperature protection device
3: A declaration test is needed when the system contains more than
- 55 lbs
- 120 lbs
- 65 lbs
- 110 lbs
4: 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
5: How many opening forces operate a thermostatic expansion valve?
- 2
- 4
- 1
- 3
6: An accumulator can be located between the
- first stage and second stage compressors
- compressor and condenser
- evaporator and compressor
- condenser and evaporator
7: Fusible plugs shall not be used with pressure vessels of
- 15 square feet or less
- 3 cubic feet or more
- 3 cubic feet or less
- 15 cubic feet or more
8: 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
9: Indirect systems using Group II refrigerants
- shall be used for mechanical equipment only
- shall be used in refrigeration system in excess of 1,000 lbs
- shall have all refrigerant containing parts except piping, installed in a Class T machine room
- shall be used in refrigeration system less than 1,000 lbs
10: An electronic bridge circuit is basically a
- Wheatstone
- high voltage circuit
- 24 volt control circuit
- suspension
11: A hissing noise at the expansion valve is a good indication that
- expansion valve is oversized
- liquid is passing thru it
- gas is passing thru it
- nothing is passing thru
12: When can 50/50 solder be used?
- in the low side
- in the high side
- liquid and suction lines
- none of the above.
13: The difference between saturated liquid and saturated vapor is
- pressure
- heat
- volume
- temperature
14: Can a R22 line set be reused for a 410A system and if it can be reused, what must be done to it?
- Flush with RX-11
- Flush with R-718
- Flush with ammonia
- Flush with R-11
15: How is bring measured?
- hydrometer
- manometer
- anemometer
- hygrometer
16: Which refrigerant is lighter than air?
- R-717
- R-11
- R-123
- R-134a
17: When a pressure gauge is permanently installed on a system, it must be ___ times the design pressure of the system.
- 1
- 1.5
- 1.2
- 2.2
18: Relief valves are rated in
- gallons of water per hour
- pounds of air per minute
- gallons of water per minute
- pounds of air per hour
19: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
20: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- High head pressure and low suction pressure
- Low head pressure and high suction pressure
- High suction pressure and high discharge pressure.
- Low suction pressure and low discharge pressure
21: 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.
- 2.5, 3.0
- 3.0, 3.5
- 6.6, 6.6
- 2.5, 2.5
22: Most CFC's are
- toxic
- inert
- inert but toxic
- flammable
23: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
24: Transformers are rated in
- volts
- amps
- volt-amps
- volts-ohms
25: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct