HVAC/R FUNDAMENTALSCDC 3E151 VOLUME 1-5
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
(801) How much sensible heat is added if the temperature of air increases from 70 to 80 F
CORRECT ANSWER
10 F
Question 2
(801) What occurs during the latent heat of condensation?
CORRECT ANSWER
Vapor turns to a liquid
Question 3
(801) What determines the pressure required to achieve a specific flow rate?
CORRECT ANSWER
Design of the piping system
Question 4
(802) What three processes take place in the condenser?
CORRECT ANSWER
Desuperheating, condensing, and subcooling
1
,Question 5
(802) The heat being absorbed in the evaporator comes from the
CORRECT ANSWER
product being cooled or the conditioned space
Question 6
(803) What happens to the exhaust valve of a compressor during the intake stroke?
CORRECT ANSWER
Backpressure from the high side closes it
Question 7
(803) What effect do fins on the shell of a compressor have?
CORRECT ANSWER
Increase surface area and allow more heat transfer with ambient air
Question 8
(803) What does a check valve in the discharge line prevent with a rotary compressor?
CORRECT ANSWER
Gas from leaking back to compressor
Question 9
2
,(803) Why must you be careful when placing meter leads on compressor terminals?
CORRECT ANSWER
This is the weakest section of the compressor and a blowout could occur
Question 10
(803) What is the result of a loose electrical connection at the compressor terminal?
CORRECT ANSWER
Increased heat
Question 11
(803) Where are internal motor protection devices embedded?
CORRECT ANSWER
In or near the motor windings
Question 12
(804) Desuperheating generally takes place in the
CORRECT ANSWER
discharge line and first few coils of the condenser
Question 13
(804) Non-condensables inside a refrigeration system are in what form?
CORRECT ANSWER
Gas
3
, Question 14
(804) In a refrigeration system air gets trapped at the
CORRECT ANSWER
top of the condenser and receiver
Question 15
(804) What effect does counter flow have in a double-tube condenser?
CORRECT ANSWER
Gives condenser a higher efficiency
Question 16
(805) What is the relationship between a capillary tube metering device and refrigerant
charge?
CORRECT ANSWER
Using a capillary device makes the charge critical
Question 17
(805) A filter strainer should be installed at the inlet of the capillary tube to
CORRECT ANSWER
prevent dirt and foreign matter from clogging the tube
4
|ACTUAL QUESTIONS AND VERIFIED
ANSWERS|BRAND NEW 2026-2027
UPDATE|GRADED A+
Question 1
(801) How much sensible heat is added if the temperature of air increases from 70 to 80 F
CORRECT ANSWER
10 F
Question 2
(801) What occurs during the latent heat of condensation?
CORRECT ANSWER
Vapor turns to a liquid
Question 3
(801) What determines the pressure required to achieve a specific flow rate?
CORRECT ANSWER
Design of the piping system
Question 4
(802) What three processes take place in the condenser?
CORRECT ANSWER
Desuperheating, condensing, and subcooling
1
,Question 5
(802) The heat being absorbed in the evaporator comes from the
CORRECT ANSWER
product being cooled or the conditioned space
Question 6
(803) What happens to the exhaust valve of a compressor during the intake stroke?
CORRECT ANSWER
Backpressure from the high side closes it
Question 7
(803) What effect do fins on the shell of a compressor have?
CORRECT ANSWER
Increase surface area and allow more heat transfer with ambient air
Question 8
(803) What does a check valve in the discharge line prevent with a rotary compressor?
CORRECT ANSWER
Gas from leaking back to compressor
Question 9
2
,(803) Why must you be careful when placing meter leads on compressor terminals?
CORRECT ANSWER
This is the weakest section of the compressor and a blowout could occur
Question 10
(803) What is the result of a loose electrical connection at the compressor terminal?
CORRECT ANSWER
Increased heat
Question 11
(803) Where are internal motor protection devices embedded?
CORRECT ANSWER
In or near the motor windings
Question 12
(804) Desuperheating generally takes place in the
CORRECT ANSWER
discharge line and first few coils of the condenser
Question 13
(804) Non-condensables inside a refrigeration system are in what form?
CORRECT ANSWER
Gas
3
, Question 14
(804) In a refrigeration system air gets trapped at the
CORRECT ANSWER
top of the condenser and receiver
Question 15
(804) What effect does counter flow have in a double-tube condenser?
CORRECT ANSWER
Gives condenser a higher efficiency
Question 16
(805) What is the relationship between a capillary tube metering device and refrigerant
charge?
CORRECT ANSWER
Using a capillary device makes the charge critical
Question 17
(805) A filter strainer should be installed at the inlet of the capillary tube to
CORRECT ANSWER
prevent dirt and foreign matter from clogging the tube
4
