Topics: All categories in the pool
1: A run capacitor is wired in series with the _____ windings.
- run
- start
- start capacitor
- common
2: Usually dry bulb temperature is
- same as wet bulb temperature
- not important and shall be ignored
- lower than dry bulb temperature
- higher than wet bulb temperature
3: How many closing forces operate a thermostatic expansion valve?
- 2
- 1
- 3
- 4
4: 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
5: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
6: Who authorizes changes to the safety codes?
- Person who pulled the permit
- Person in charge of the facility
- Board of Boilers
- Contractor who last serviced the system.
7: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall be prohibited
- shall not be prohibited
8: What is a Category "D" fluid?
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily contact
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and design temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump ssytems
- Any fluid that exceeds 150 psig and has design temperature of over 366F
9: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Stay open
- Over feed
- Under feed
10: 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
11: What is the maximum voltage range allowed on an electrical circuit?
- 20%
- 5%
- 10%
- 15%
12: While water is evaporated in an evaporative condenser the impurities which were in the water are
- accumulate in the sump water
- washed out of the air by the spray pump
- remain in the air
- blown to the atmosphere by the fan
13: The solution that leaves the concentrator in an absorption chiller is referred to as the
- absorbed solution
- weak solution
- strong solution
- diluted solution
14: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- type of refrigerant
- designed head pressure
15: Which occupancy can ammonia be used in?
- commercial
- depends on the quantity of freon
- redifential
- industrial
16: Dew point is
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to evaporate
- the temperature above which water vapor in the air will start to condense
- the temperature below which water vapor in the air will start to condense
17: Megaohm meter's main function is
- to detect weak motor winding insulation of a refrigeration or air conditioning compressor by creating high DC voltages to the compressor
- to detect very high resistances to ground of refrigeration or air conditioning compressors
- to test very high value capacitors for large 3-phase refrigeration compressors and blower motors.
- Both a and b are correct
18: Low-side system leaks in a low-pressure chiller will often result in
- nitrogen leaking out of the system.
- air being pulled into the system
- water being pulled into the system
- system refrigerant leaking from the system
19: A solder joint melts at temperatures of
- 1,200F to 1,500F
- less than 400F
- 400F to 800F
- 600F to 900F
20: On a single phase motor, when does the start winding cut out?
- 50% of its RLA speed
- 75% of its RLA speed
- 100% of its RLA speed
- 25% of its RLA speed
21: What is the refrigerant chlorodifluoromethane?
- R-22
- R-123
- R-12
- R-134a
22: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 1,000,000 ohms
- up to 10,000 ohms
- up to 1,000 ohms
23: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
24: Which refrigerant class listed below is the most flammable?
- A-3
- C-3
- B-2
- A-1
25: How many opening forces operate a thermostatic expansion valve?
- 4
- 2
- 1
- 3