Power Engineering - 4B11 Practice Questions With
Complete Solutions
________ have largely replaced the cast-iron radiator in modern
installations.
a. unit heaters
b. open heaters
c. convectors
d. space heaters
e. radiator traps Correct Answers c. convectors
206 kPa is equivalent to a head of water of:
a. 1.0 m
b. 21 m
c. 0.5 m
d. 15 m
e. 25 m Correct Answers b. 21 m
A compressor at higher altitude require a higher compression
ratio.
a. True
b. False Correct Answers a. True
A compressor with _____ is known as an angle compressor.
a. A V type cylinder arrangement
b. Horizontal cylinder arrangement
c. One cylinder on the horizontal axis and the other on the
vertical axis
,d. A Y type cylinder arrangement
e. 45 type cylinder arrangement Correct Answers c. One
cylinder on the horizontal axis and the other on the vertical axis
A flow control valve is a:
a. none of the answers
b. lift type check valve
c. modulating control valve
d. relief valve
e. needle valve Correct Answers c. modulating control valve
A forced hot water circulating system can be classified as which
of the following types?
a. one pipe system
b. two pipe reverse return system
c. two pipe direct return system
d. series loop system
e. all of the answers Correct Answers e. all of the answers
A free piston air compressor:
a. has two crankshaft
b. has a cushion cylinder that acts as a flywheel
c. has a common intake and discharge valve system
d. has a spare or free piston for air compression
e. uses one steam cylinder to drive two compression pistons
Correct Answers b. has a cushion cylinder that acts as a
flywheel
,A heat pipe:
a. depends on the parallel flow of air over its axis for high
efficiency
b. has limited applications in industry
c. uses gravity to force refrigerant from one end to the other
d. is a sealed tube containing a volatile liquid
e. can be interconnected to other heat pipes to increase capacity
Correct Answers d. is a sealed tube containing a volatile liquid
A hot water boiler of same output compared to steam boiler is:
a. shorter
b. non of the answers
c. same size
d. smaller
e. larger Correct Answers d. smaller
A hot water boiler of the same output is:
a. shorter than a steam boiler
b. taller than a steam boiler
c. the same size as a steam boiler
d. larger than a steam boiler
e. smaller than a steam boiler Correct Answers e. smaller than a
steam boiler
A hot water system which circulates water through the pipes
with a pump is known as a:
a. pumped system
, b. forced system
c. gravity system
d. return system
e. circulating system Correct Answers b. forced system
A kitchen exhaust fan reduces the calculated heat gain from the
cooking appliances it serves, by a factor of
a. 60%
b. 50%
c. 75%
d. 25%
e. 10% Correct Answers b. 50%
A noisy circulator can be caused by:
a. impeller unbalanced
b. faulty bearing
c. pump suction restricted
d. all of the answers
e. non of the answers Correct Answers d. all of the answers
A one stage reciprocating compressor may be used for
compression of up to -------- kPa. Correct Answers 1000
A pressure balancing arrangement that prevents the boiler
pressure from forcing boiler water into the return lines is called
a:
a. Back-flow preventer
b. Relief valve
Complete Solutions
________ have largely replaced the cast-iron radiator in modern
installations.
a. unit heaters
b. open heaters
c. convectors
d. space heaters
e. radiator traps Correct Answers c. convectors
206 kPa is equivalent to a head of water of:
a. 1.0 m
b. 21 m
c. 0.5 m
d. 15 m
e. 25 m Correct Answers b. 21 m
A compressor at higher altitude require a higher compression
ratio.
a. True
b. False Correct Answers a. True
A compressor with _____ is known as an angle compressor.
a. A V type cylinder arrangement
b. Horizontal cylinder arrangement
c. One cylinder on the horizontal axis and the other on the
vertical axis
,d. A Y type cylinder arrangement
e. 45 type cylinder arrangement Correct Answers c. One
cylinder on the horizontal axis and the other on the vertical axis
A flow control valve is a:
a. none of the answers
b. lift type check valve
c. modulating control valve
d. relief valve
e. needle valve Correct Answers c. modulating control valve
A forced hot water circulating system can be classified as which
of the following types?
a. one pipe system
b. two pipe reverse return system
c. two pipe direct return system
d. series loop system
e. all of the answers Correct Answers e. all of the answers
A free piston air compressor:
a. has two crankshaft
b. has a cushion cylinder that acts as a flywheel
c. has a common intake and discharge valve system
d. has a spare or free piston for air compression
e. uses one steam cylinder to drive two compression pistons
Correct Answers b. has a cushion cylinder that acts as a
flywheel
,A heat pipe:
a. depends on the parallel flow of air over its axis for high
efficiency
b. has limited applications in industry
c. uses gravity to force refrigerant from one end to the other
d. is a sealed tube containing a volatile liquid
e. can be interconnected to other heat pipes to increase capacity
Correct Answers d. is a sealed tube containing a volatile liquid
A hot water boiler of same output compared to steam boiler is:
a. shorter
b. non of the answers
c. same size
d. smaller
e. larger Correct Answers d. smaller
A hot water boiler of the same output is:
a. shorter than a steam boiler
b. taller than a steam boiler
c. the same size as a steam boiler
d. larger than a steam boiler
e. smaller than a steam boiler Correct Answers e. smaller than a
steam boiler
A hot water system which circulates water through the pipes
with a pump is known as a:
a. pumped system
, b. forced system
c. gravity system
d. return system
e. circulating system Correct Answers b. forced system
A kitchen exhaust fan reduces the calculated heat gain from the
cooking appliances it serves, by a factor of
a. 60%
b. 50%
c. 75%
d. 25%
e. 10% Correct Answers b. 50%
A noisy circulator can be caused by:
a. impeller unbalanced
b. faulty bearing
c. pump suction restricted
d. all of the answers
e. non of the answers Correct Answers d. all of the answers
A one stage reciprocating compressor may be used for
compression of up to -------- kPa. Correct Answers 1000
A pressure balancing arrangement that prevents the boiler
pressure from forcing boiler water into the return lines is called
a:
a. Back-flow preventer
b. Relief valve
