Topics: All categories in the pool
1: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
2: Name a reason that does not cause reduced condenser air quantity
- Prevailing winds
- Dirty fan blades
- Dirty Coil
- High ambient temperature
3: A 3-cubic foot receiver must have what type of relief valve?
- fusible plug
- relief valve
- rupture device
- none of the above
4: What device removes the start winding from the circuit of a split-phase motor once the motor reaches 75% of its rated load amps (RLA)?
- duel-voltage switch
- printed circuit board (PCB)
- motor starter
- centrifugal switch
5: What kind of system uses two different refrigerants in separate systems dependent on each other?
- Low pressure
- Cascade
- R-414B
- Simple
6: Ammonia vaporization takes place at what temperature?
- -28F
- -460F
- -32F
- -110F
7: Calculate the voltage in a series circuit when the total amperage is 10 amps and the resistors have values of: R1=12 ohms, R2=8 ohms, R3=4 ohms
- 2,400 volts
- 240 volts
- 2.40 volts
- 24.0 volts
8: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- diluted solution
- weak solution
- strong solution
9: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusion plug
- fusible plug
- rupture plug
- relief plug
10: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 33
- 18
- 22
- 50
11: Volts x amps equals
- Watts
- Impedance
- Inductance
- Ohms Law
12: Class T machine room
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
- shall have remote controls to stop the action of the refrigerant compressor
- shall include closets used for setting equipment
13: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- two tons of cooling
- three tons of cooling
- 12,000 tons of cooling
14: When using nitrogen for brazing, the pressure should be:
- 125 psig
- Very low
- 50-100 psig
- Slightly below atmospheric
15: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- the gas is no longer saturated
- the gas returns to a liquid
- any decrease in pressure will cause condensation
16: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Copper oxide formation is prevented
- Discoloration is prevented
- Exterior scale formation is minimized
17: Pairs of mating stop valves that allow sections of a system to be joined before opening these valves or separated after closing them are
- companion or block valves
- gate or globe valves
- ball valves
- king valves
18: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
19: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- starved evaporator
- too small evaporator
- compressor suction valve stuck open
- overcharged
20: What refrigerant were phased out in 2004?
- R-22
- R-12
- R-11
- R-134a
21: The proper location for an oil separator is between the
- evaporator and compressor
- compressor and condenser
- receiver and metering device
- condenser and receiver
22: Three-phase motors have what type of windings?
- three run windings
- three start windings
- three run windings and 3 start windings
- one start winding and one run winding.
23: What are the three components of a transformer?
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
- Primary coil, secondary coil, and copper contacts
24: Pressure vessels having an inside diameter of 6” or less shall be protected by
- either a fusible plug or a pressure relief device
- a fusible plug
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a pressure relief device
25: The rupture disc on a low-pressure chiller typically releases pressure at
- 0 psig
- 10 psig
- 15 psig
- 5 psig