Modern Refrigeration Chapter 54
WB Questions and Answers 100%
Correct
To avoid overlooking details, a commercial refrigeration system should be inspected
in a __________ manner. - ANSWER - Systematic
The following checks should be done on many open-drive compressors. - ANSWER -
Belt alignment, belt condition and tightness, coupling connection and condition.
A major concern for electrical wiring for refrigeration systems is that the wires must
be large enough to in order to ________. - ANSWER - Carry the necessary amount of
current
Before checking whether the proper voltage is available at a specific component, be
sure to _______. - ANSWER - Set your meter to the proper setting.
When using a clamp-on ammeter to check the current draw on a given electrical
load, be sure to ________. - ANSWER - Clamp around only one of the load's wires
When servicing a single compressor, do not start the unit without having a fully
functioning _______ in the circuit. - ANSWER - Overload cut-out device
A motor that is exhibiting excessive endplay can be remedied using _________. -
ANSWER - Washers
A noisy external motor should prompt a technician to check pulley bearing
__________ to determine whether the bearings should be lubricated or replaced. -
ANSWER - Temperature
A saf installation includes having a motor's __________ grounded. - ANSWER - Frame
, An external motor's sheave should be checked using a(n) _______. - ANSWER - Wear
gauge
The most common trouble of the shaded-pole motors used to drive fans is worn
_______. - ANSWER - Bearings
When an open-drive reciprocating compressors is producing a sharp clicking noise
during operation, the problem is most likely _______. - ANSWER - Faulty inlet and
discharge valves
High head pressure in an air-cooled condenser may be caused by ________. -
ANSWER - Noncondensables in the system
True or False. Most commercial air-cooled condensers can be cleaned by a high-
pressure jet of air, high-pressure water with detergents, mechanical scrubbing, or a
vacuum cleaner. - ANSWER - True
Water flow through a water-cooled condenser should be adjusted so the
temperature rise of the water does not exceed a ________ rise. - ANSWER - 15˚F
Erratic refrigeration and constant oil slugging or pumping most likely indicates
______ in the system. - ANSWER - Excess oil
An open-drive reciprocating compressor should be repaired or replaced if when it is
isolated from the rest of the system, it cannot, ________. - ANSWER - Hold and
maintain pressures produced, produce sufficient high pressure, produce sufficient
vacuum.
A gauge manifold is connected to an open-drive compressor that is isolated from
the rest of the system. A technician turns the compressor's crankshaft a few times
to produce vacuum in the crankcase and high pressure in the discharge. A
crankshaft seal leak would then be indicated by ________. - ANSWER - A gradual rise
on the compound gauge
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 NursingTutor1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.49. You're not tied to anything after your purchase.
