modern refrigeration chapter 54 wb questions and a
modern refrigeration chapter 54 wb stuvia
to avoid overlooking details a commercial refrig
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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
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