Topics: All categories in the pool
1: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Zinc
- Nickel
- Magnesium
- Copper
2: Walls and doors of a machinery room shall be at least _____ hour(s) fire rated.
- 5
- 2
- 3
- 1
3: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- 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 an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
4: By using nitrogen within a pipe during brazing operation,
- The explosion hazard is confined
- Exterior scale formation is minimized
- Discoloration is prevented
- Copper oxide formation is prevented
5: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 1000 watts
- 600 watts
- 5KW
6: Which is the lowest vacuum?
- 10 psia
- 1,000 Microns
- 5" hg
- 5 psig
7: If a low-pressure chiller has a low-side leak, which of the following will most likely result?
- Low suction pressure and low discharge pressure
- Low head pressure and high suction pressure
- High suction pressure and high discharge pressure.
- High head pressure and low suction pressure
8: A start capacitor is wired in _____ with the start windings.
- parallel
- junction
- series
- series-parallel
9: A moisture indicator must
- be sight side up
- be filled with liquid
- change color when exposed to moisture
- be yellow
10: Low pressure chiller systems use what type of compressor?
- Scroll
- Screw
- Centrifugal
- Reciprocating
11: What pipe can not be used for refrigeration?
- N
- L
- K
- M
12: A solder joint melts at temperatures of
- 1,200F to 1,500F
- less than 400F
- 600F to 900F
- 400F to 800F
13: The ____ design is the maximum pressure for which a specific part of a refrigeration system is designed.
- critical pressure
- low pressure
- high pressure
- design pressure
14: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 1
- 2
15: When using nitrogen for brazing, the pressure should be:
- 50-100 psig
- 125 psig
- Slightly below atmospheric
- Very low
16: A split-phase motor has a ______ winding and a ____ winding
- start, common
- run, common
- run, start
- duel-run, duel-start
17: It takes how many BTU/hr to melt one pound of ice at 32F
- 180
- 970
- 212
- 144
18: Which winding have the most turns?
- Start
- depends on the motor phase
- run
- they have equal amount of turns
19: How are safety controls wired in a circuit?
- Series
- Series/parallel
- Either series or parallel
- Parallel
20: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
21: What is the refrigerant chlorodifluoromethane?
- R-134a
- R-123
- R-12
- R-22
22: When an inspection is needed, how often must it be done?
- every 36 months
- every 18 months
- annually
- every 24 months
23: "I" represents ____ in the Ohm's law formula.
- capacitance
- resistance
- amperage
- voltage.
24: Where would the EPR valve be located on a multiple evaporator system?
- outlet of the liquid line
- inlet of the low temperature evaporator.
- outlet of low temperature evaporator
- outlet of high temperature evaporator
25: The color code of a tank of ammonia is
- silver
- light green
- white
- lavender