HVAC Excellence Test Commercial AC. Exam Questions And Answers 100% Pass
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Course
HVAC
Institution
HVAC
HVAC Excellence Test Commercial AC.
Exam Questions And Answers 100% Pass
Condenser fan-cycling controls have the same action as a low-pressure control except it: -
answerIs used to control the high pressure also.
A sling psychometer is used to measure - answerwet and dry bulb temperature.
Some...
HVAC Excellence Test Commercial AC.
Exam Questions And Answers 100% Pass
Condenser fan-cycling controls have the same action as a low-pressure control except it: -
answer✔Is used to control the high pressure also.
A sling psychometer is used to measure - answer✔wet and dry bulb temperature.
Some compressors are fitted with an unloading device to - answer✔provide variable capacity.
Compressor net oil pressure is determined by - answer✔oil pump discharge pressure minus
suction pressure.
A compressor is operating with a discharge pressure of 185.3 psig and a suction pressure of 25.3
psig. The compression ratio (pumping ratio) is: - answer✔5:1
Got Gas Bypass refers to a method of - answer✔preventing low suction pressure.
The capacity of a cooling tower depends on the - answer✔Entering air wet bulb temperature.
Wet bulb depression is the difference - answer✔between wet bulb and dry bulb temperatures.
Refrigerant in the suction light should be slightly superheated in order to - answer✔insure liquid
refrigerant does not enter the compressor.
On split system installations, the suction line should be pitched towards the compressor at least -
answer✔One inch per ten feet.
The most reliable and safest method of field charging a system is to charge - answer✔by weight
according to the manufacturer's specifications
Approximately how much airflow is required across the evaporator per ton of cooling capacity? -
answer✔350-450 cfm per ton
the amount of heat absorbed in the evaporator is equal to the heat - answer✔given off by the
condenser minus the heat of compression.
If a TEV sensing bulb has lost all of its charge, what effect would this have on the air
conditioning system? - answer✔It would cause low side pressure to increase.
A decrease in water flow, when using a water - cooled condenser - answer✔increases the power
consumption of the compressor.
High compressor operating temperatures can be caused by - answer✔high compression ratios.
What is the purpose of a distributor? - answer✔It evenly feeds refrigerant to the evapaorator
Upon investigation of a "no cooling" complaint, the technician finds that the blower motor of the
air handler has open windings. One week ago, this same unit was found to have a broken belt
caused by a worn drive pulley. Both the belt and pulley were replaced at that time. The
technician decides to replace the motor and; - answer✔adjust the drive pulley to decrease amp
draw.
An air conditioning unit has a suction line iced up to the compressor. What would this be an
indication of? - answer✔A low refrigerant charge.
Depending on the application, suction lines may be ______ to assure proper oil return. -
answer✔trapped
When sizing a cooling tower, it is important to know that one pound of evaporating water can
absorb - answer✔970 BTU's
Polvolester oils - answer✔have more atmospheric moisture than mineral oil.
The clearance space in a reciprocating compressor - answer✔has an effect on compressor
capacity.
Which of the following will cause a major change in compressor capacity when retrofitting to
another type of refrigerant? - answer✔Discharge pressure
A disadvantage to the reciprocating compressor over other designs is - answer✔some refrigerant
will always remain in the clearance space.
The flow switches of a chiller's control system - answer✔Allow refrigeration system operation
only when the water circulating pumps are energized
What is used to control the flow of water on a water-cooled condenser? - answer✔A water
regulating valve
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