CDC: 3E151 - HVAC/R JOURNEYMAN VOLUME 5 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
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Module
CDC: 3E151
Institution
CDC: 3E151
CDC: 3E151 - HVAC/R JOURNEYMAN VOLUME 5 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED
(801) How much sensible heat is added if the temperature of air increases from 70 to 80 F
10 F
(801) What occurs during the latent heat of condensation?
Vapor turns to a liquid
(801) What deter...
(801) How much sensible heat is added if the temperature of air increases from 70
to 80 F
10 F
(801) What occurs during the latent heat of condensation?
Vapor turns to a liquid
(801) What determines the pressure required to achieve a specific flow rate?
Design of the piping system
(802) What three processes take place in the condenser?
Desuperheating, condensing, and subcooling
(802) The heat being absorbed in the evaporator comes from the
product being cooled or the conditioned space
(803) What happens to the exhaust valve of a compressor during the intake
stroke?
Backpressure from the high side closes it
(803) What effect do fins on the shell of a compressor have?
Increase surface area and allow more heat transfer with ambient air
(803) What does a check valve in the discharge line prevent with a rotary
compressor?
Gas from leaking back to compressor
(803) Why must you be careful when placing meter leads on compressor
terminals?
, This is the weakest section of the compressor and a blowout could occur
(803) What is the result of a loose electrical connection at the compressor
terminal?
Increased heat
(803) Where are internal motor protection devices embedded?
In or near the motor windings
(804) Desuperheating generally takes place in the
discharge line and first few coils of the condenser
(804) Non-condensables inside a refrigeration system are in what form?
Gas
(804) In a refrigeration system air gets trapped at the
top of the condenser and receiver
(804) What effect does counter flow have in a double-tube condenser?
Gives condenser a higher efficiency
(805) What is the relationship between a capillary tube metering device and
refrigerant charge?
Using a capillary device makes the charge critical
(805) A filter strainer should be installed at the inlet of the capillary tube to
prevent dirt and foreign matter from clogging the tube
(805) In figure 1-41 where is the point of complete vaporization?
V
(805)When the evaporator pressure rises after the compressor stops the
automatic expansion valve (AXV)?
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