Topics: All categories in the pool
1: If a halide torch is used for leak detection, what color is the flame if it detects a leak?
- red
- blue
- orange
- green
2: "P" represents ______ in the Watt's law formula
- voltage
- reactance
- amperage
- watts
3: Class T machine room
- 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
- has no flame producing apparatus permanently installed
4: R-717 is
- carbon dioxide
- water
- trichloromethane
- ammonia
5: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-positive displacement compressor
- negative displacement compressor
- non-volumetric displacement compressor
- neutral chamber-type compressor
6: On a single phase motor, when does the start winding cut out?
- Start windings do no cut-out of the run cycle
- At 25% of its full rated speed
- At 50% of its full rated speed
- At 75% of its full rated speed
7: The first step in mechanical refrigeration is
- condensation
- expansion
- compression
- evaporation
8: What is the voltage of each leg to ground of a three-phase motor with a 460v supply voltage?
- 277v
- 120v
- 208v
- 240v
9: When a refrigerating machinery room is used, the emergency procedures shall be posted
- inside the room, immediately adjacent to each door
- outside the room, immediately adjacent to each door
- on a conspicuous card located near the compressor
- on a conspicuous card located near the evaporator
10: Gauge pressure is
- what a gauge reads when checking pressures on a chilled water system.
- absolute pressure
- force of pressure above that of atmospheric
- atmospheric pressure
11: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
12: An example of an "Expendable Refrigerant" is
- lithium bromide
- liquid nitrogen
- ammonia
- liquid oxygen
13: If the power element of an expansion valve should lose its charge the valve would
- underfeed the evaporator
- overfeed the evaporator
- go closed
- go open
14: What is Trichlorotrifluoromethane?
- R-113
- R-11
- R-12
- R-13
15: The formula for Pure Power in a resistance circuit is
- Watts X power factor
- Kw = volts X amps
- Watts X amps.
- Watts = volts X amps
16: Which of the following is NOT a positive displacement compressor?
- screw
- scroll
- centrifugal
- reciprocating
17: Pressure is equivalent of
- Area X Force
- Force
- Force / Area
- Force X Area
18: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 600 watts
- 746 watts
- 1000 watts
- 5KW
19: A High-Probablity system
- is a system highly likely to leak from a failed connection or component of such system
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from failed connections will enter the unoccupied space
- is such that a leak of refrigerant from failed connections will enter the occupied space
20: What type of voltage causes the winding in a potential relay to open?
- BEMF (Back Electro-Motive Force)
- 24V control voltage from the thermostat
- 120V line voltage
- None of the above
21: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 660 lbs
- 55 lbs
- 550 lbs
- 330 lbs.
22: 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
23: Control systems can be classified by
- tonnage of system
- safety
- economy of operation
- source of power
24: What type of relief valve is used on low pressure centrifugal compressor systems?
- Spring-loaded relief valve
- Rupture disc
- Purge relief
- None of the above
25: Methyl Chloride is a halogenated refrigerant and should not come in contact with
- aluminum
- zinc
- magnesium
- all of the above