Topics: All categories in the pool
1: The high side float assembly meters refrigerant into the evaporator through the
- lower chamber of the low side
- upper chamber of the high side
- lower chamber of the high side
- upper chamber of the low side
2: If the power element of an expansion valve should lose its charge the valve would
- underfeed the evaporator
- go open
- go closed
- overfeed the evaporator
3: Usually dry bulb temperature is
- lower than dry bulb temperature
- higher than wet bulb temperature
- same as wet bulb temperature
- not important and shall be ignored
4: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Moisture indicator
- Muffler
- Foot valve
5: Pressure relief valves shall be marked with the data from
- Section IV Division of the ASME Boiler & Pressure Code
- Section VIII Division of the ASME Boiler & Pressure Code
- Section I Division VIII of ASME Boiler & Pressure Code
- Section XIII Division of the ASME Boiler & Pressure Code
6: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 5 amps
- 10 amps
- 15 amps
- 20 amps
7: An oil pressure safety switch should be set at
- 5 to 10 psi below low side pressure
- 5 to 10 psi above low side pressure
- 10-15 psi above low side pressure
- 10 to 15 psi below low side pressure
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: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Cascade
- Low pressure
- Simple
- R-414B
10: Where must a refrigeration contractor's license number be displayed?
- Trucks, invoices, and advertising
- Truck, office, every job, and on all equipment
- Trucks, license plates, and uniforms
- Uniforms, checks, and invoices.
11: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts X amps.
- Watts X power factor
- Watts = volts X amps
12: How many BTU's is produced by one watt of energy
- 3.00
- 1
- 3.41
- 2.57
13: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
14: The certificate of inspection
- 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
- shall be authorized by a notarized insurance company
- shall be posted on the compressor shell or electrical panel at the unit
15: What is the purpose of suction/discharge traps?
- to ensure proper oil return to the compressor
- to keep oil inside the evaporator for proper oil return to the compressor
- to keep oil inside of the accumulator for proper return to the compressor
- all of the above
16: In a refrigeration system, you open a valve from the condenser and collect some material on a clean white sheet of bond paper, which of the following would you most likely be testing for?
- checking the level of refrigerant in the system
- testing for oil in the system
- testing for moisture in the system
- none of the above
17: A motor starter contains a thermal overload and a
- contactor
- transformer
- 3-way relay
- solenoid
18: A High-Probability System
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
19: Watt's Law indicates Volts X Amps = _________.
- Watts
- Ohms
- Resistance
- Current
20: If a condenser is on a roof and the temperature is 35F and dropping the capacity
- increases
- doesn't change
- decreases
- run as designed with low ambient controls
21: Refrigeration devices shall be equipped with a ____ to protect against unexpected pressure due to a malfunction or fire?
- Temperature limiter device
- T&P device
- Circuit Breaker
- Relief valve
22: R-22 falls under which safety classification?
- A-1
- B-1
- A-2
- B-2
23: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 100%
- 90%
- 80%
24: The most common type of motor starter is
- across the line starter
- part winding starter
- delts-wye starter
- duel-winding starter
25: How are refrigerant blends classified?
- Based on worst case fractionation
- Based on the oil used
- Blends don't have to be classified
- Based on best case Fractionation