Topics: All categories in the pool
1: Refrigerant systems containing Group I refrigerants can be installed in or on public stairways.
- True
- False
2: The proper location for an oil separator is between the
- receiver and metering device
- condenser and receiver
- compressor and condenser
- evaporator and compressor
3: Class 3 refrigerants are
- toxic
- non-flammable
- highly flammable
- non-toxic
4: While water is evaporated in an evaporative condenser the impurities which were in the water are
- washed out of the air by the spray pump
- blown to the atmosphere by the fan
- remain in the air
- accumulate in the sump water
5: Low-side system leaks in a low-pressure chiller will often result in
- water being pulled into the system
- nitrogen leaking out of the system.
- system refrigerant leaking from the system
- air being pulled into the system
6: What is R-290?
- Drop-in replacement for R-134a
- Methyl Chloride
- Propane
- Butane
7: When must refrigeration system covered by the code be inspected?
- Annually and when installed
- Not required
- Annually
- Upon installation
8: Ammonia belongs to Group
- B-1
- A-2
- B-2
- A-1
9: A motor starter contains a thermal overload and a
- transformer
- 3-way relay
- solenoid
- contactor
10: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
- The machine will stop cooling and solution will crystallize
11: System design pressures must take into consideration, not only, pressures found during normal operation but also what?
- When it's cold out
- When there is a malfunction on the high side
- When its warm out
- All of the above
12: "I" represents ____ in the Ohm's law formula.
- voltage.
- resistance
- capacitance
- amperage
13: Capacity control on an absorption system is typically accomplished by varying the
- speed of the chilled water circulatory pump
- rate at which heat is supplied to the generator
- pressure setting on the system's rupture disc
- speed of the condenser water circulator pump
14: What is wire duct?
- A rigid rectangular channel or tray used to organize, route, and protect electrical wires and cables
- Conduit
- Wires enclosed in plastic or steel piping of some sort to protect wires from the elements
- None of the above
15: In a motor, an internal overload might open if
- there's an excess current draw through the motor
- there's a direct short
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
16: Most CFC's are
- inert
- toxic
- inert but toxic
- flammable
17: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 27 ohms
- 104 ohms
- 80 ohms
- 71 ohms
18: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Saturated temperature
- Critical temperature
- Wet bulb temperature
- Dry bulb temperature
19: Which is the lowest vacuum?
- 1,000 Microns
- 5" hg
- 5 psig
- 10 psia
20: What is Absolute Zero?
- -773F
- -400F
- -460F
- -640F
21: Can you use Ammonia in industrial applications?
- Yes, Under certain condidtions
- When mixed with R-718
- No, never
- Yes, always
22: What is used to check very low air pressures in air conditioning duct?
- Vacuum gauge
- Barometer
- Manometer
- Anemomter
23: Relief valves are rated in
- gallons of water per hour
- gallons of water per minute
- pounds of air per minute
- pounds of air per hour
24: In a system designed for sub-zero ambient temperatures, what must be added?
- Booster compressor
- Infrared dye for leak identification
- Low-ambient kit
- Nitrogen
25: Refrigerant piping crossing an open space that affords passageway in any building shall not be less than _____ feet above the floor unless piping is located against the ceiling.
- 7.00'
- 7.25'
- 9.00'
- 8'4"