HVAC Excellence Test Commercial AC. Exam Questions And Answers 100% Pass
4 views 0 purchase
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Brightstars. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
