HVAC Level 2 03302 Compressors Exam Questions with Correct Answers
4 views 0 purchase
Course
HVAC Level 2 03302 Compressors
Institution
HVAC Level 2 03302 Compressors
HVAC Level 2 03302 Compressors Exam Questions with Correct Answers
Line-duty device - Answer-A motor protection device that senses current flow and temperature in the motor windings. If an overload occurs, it opens the motor winding circuit to remove the line voltage.
Pilot-duty device - Answe...
HVAC Level 2 03302 Compressors Exam
Questions with Correct Answers
Line-duty device - Answer-A motor protection device that senses current flow and
temperature in the motor windings. If an overload occurs, it opens the motor winding
circuit to remove the line voltage.
Pilot-duty device - Answer-A protection device that senses current overload or
excessive temperature within the motor and opens the contactor control circuit to stop
the motor.
Positive-displacement compressor - Answer-Any compressor in which the pumping
action is created by pistons or moving chambers.
Pressure (force-feed) lubrication system - Answer-A method of compressor lubrication
that uses an oil pump mounted on the end of the crankshaft to draw oil from the
crankcase and force it to the compressor main bearings, lower connecting rod bearings,
and piston pins.
Pump-down - Answer-The process of operating a compressor to clear most or all
refrigerant from the low-pressure side of the system, or a portion thereof. A pump-down
cycle is used on some systems to clear remaining refrigerant from the evaporator and
suction line that could condense to a liquid during the off cycle.
Short-cycling - Answer-A condition in which the compressor is restarted immediately
after it has been turned off; sometimes accompanied by very short run times as well.
Single-phasing - Answer-A condition in which a three-phase load receives power from
only two of the three phases.
Slugging - Answer-The entrance of liquid refrigerant and/or a significant amount of oil
into a compressor cylinder. Slugging can occur at startup due to condensed refrigerant
and/or collected oil near the compressor inlet.
Burnout - Answer-A condition in which the breakdown of the motor winding insulation
causes the windings to electrically short to ground.
Capacity control - Answer-The manipulation of compressor or system operation to
change the refrigeration capacity.
Clearance volume - Answer-The amount of clearance between a piston at the top dead-
center position of travel and the cylinder head.
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 Perfectscorer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
