Power Engineering 4th Class unit B 2-
chapter 3 Exam Questions & Answers
(Grade A+)
Single stage reciprocating air compressors have:
Choose one answer.
a. One or more cylinders of equal size
b. Variable speed drivers
c. Several cylinders, each of different sizes
d. Low power requirements
e. Intercoolers -
correct answer ✅a
A reciprocating air compressor works on the principle of:
Choose one answer.
a. Pressure reduction
b. Velocity increase
c. Centrifugal force
d. Volumetric expansion
e. Volume reduction -
correct answer ✅e
,Power Engineering 4th Class unit B 2-
chapter 3 Exam Questions & Answers
(Grade A+)
An air compressor may be automatically started and stopped by a
pressure switch, which is usually found connected to the:
Choose one answer.
a. Intercooler
b. Aftercooler
c. Separator
d. Receiver
e. Control panel -
correct answer ✅d
A belt driven lubricator is commonly found on a:
Choose one answer.
a. Reciprocating double acting compressor
b. Screw compressor
c. Rotary lobe compressor
d. Centrifugal compressor
e. Sliding vane compressor -
correct answer ✅e
, Power Engineering 4th Class unit B 2-
chapter 3 Exam Questions & Answers
(Grade A+)
An air receiver used in an air compression system :
Choose one answer.
a. Reduces the energy required to compress air
b. Eliminates pulsation in discharge lines
c. Provides a location to trap airborne dirt
d. Controls the temperature of the air before it enters the system
e. Eliminates moisture from the air -
correct answer ✅b
Sliding vane compressors:
Choose one answer.
a. Are double acting compressors
b. Use suction and discharge valves
c. Are dynamic compressors
d. Use cylinder unloading
e. Are positive displacement compressors -
correct answer ✅e
Centrifugal compressors:
chapter 3 Exam Questions & Answers
(Grade A+)
Single stage reciprocating air compressors have:
Choose one answer.
a. One or more cylinders of equal size
b. Variable speed drivers
c. Several cylinders, each of different sizes
d. Low power requirements
e. Intercoolers -
correct answer ✅a
A reciprocating air compressor works on the principle of:
Choose one answer.
a. Pressure reduction
b. Velocity increase
c. Centrifugal force
d. Volumetric expansion
e. Volume reduction -
correct answer ✅e
,Power Engineering 4th Class unit B 2-
chapter 3 Exam Questions & Answers
(Grade A+)
An air compressor may be automatically started and stopped by a
pressure switch, which is usually found connected to the:
Choose one answer.
a. Intercooler
b. Aftercooler
c. Separator
d. Receiver
e. Control panel -
correct answer ✅d
A belt driven lubricator is commonly found on a:
Choose one answer.
a. Reciprocating double acting compressor
b. Screw compressor
c. Rotary lobe compressor
d. Centrifugal compressor
e. Sliding vane compressor -
correct answer ✅e
, Power Engineering 4th Class unit B 2-
chapter 3 Exam Questions & Answers
(Grade A+)
An air receiver used in an air compression system :
Choose one answer.
a. Reduces the energy required to compress air
b. Eliminates pulsation in discharge lines
c. Provides a location to trap airborne dirt
d. Controls the temperature of the air before it enters the system
e. Eliminates moisture from the air -
correct answer ✅b
Sliding vane compressors:
Choose one answer.
a. Are double acting compressors
b. Use suction and discharge valves
c. Are dynamic compressors
d. Use cylinder unloading
e. Are positive displacement compressors -
correct answer ✅e
Centrifugal compressors:
