Power Engineering 4th Class - A7
Exam 2025 Questions and Answers
Improper drainage of steam lines could cause:
a. Water hammer
b. Excessive weight to the pipe
c. Low pressure in the lines
d. Excessive steam pressures - Correct Answer✔️✔️-a
A bellows corrugated expansion joint is suitable for pressures up to approximately _______ kPa:
a. Unlimited
b. 500
c. 1000
d. 2000 - Correct Answer✔️✔️-d
For a given nominal pipe size, as the wall thickness of the pipe increases, the:
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,a. Bore of the pipe increases
b. Weight of the pipe decreases
c. Outside diameter increases
d. Inside diameter is reduced - Correct Answer✔️✔️-d
All pipe weights with the same nominal pipe size have the same:
a. Mass per metre of length
b. Thickness
c. Outside diameter
d. Inside diameter - Correct Answer✔️✔️-c
One disadvantage of using threaded connections to join pipes and fittings is that it:
a. difficult to insulate
b. Requires the services of a pipe fitter
c. is more costly
d. Weakens the pipe - Correct Answer✔️✔️-d
When admitting steam to a steam piping system it is imperative to:
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, a. Ensure drain valves are closed to prevent steam loss.
b. Add nitrogen to steam to prevent corrosion.
c. First ensure that no water exists or can accumulate in the piping.
d. Use the glycol tracing to warm the line. - Correct Answer✔️✔️-c
The valve that is least susceptible to wire drawing and seat erosion is the _________ valve.
Select one:
a. Globe
b. Gate
c. Plug
d. Wedge gate - Correct Answer✔️✔️-a
Expansion of piping is controlled by:
a. Installing spring supports on the pipe
b. Preheating the pipe prior to installation
c. Installing an expansion joint in the line
d. Anchoring the pipe at both ends to prevent movement - Correct Answer✔️✔️-c
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
Exam 2025 Questions and Answers
Improper drainage of steam lines could cause:
a. Water hammer
b. Excessive weight to the pipe
c. Low pressure in the lines
d. Excessive steam pressures - Correct Answer✔️✔️-a
A bellows corrugated expansion joint is suitable for pressures up to approximately _______ kPa:
a. Unlimited
b. 500
c. 1000
d. 2000 - Correct Answer✔️✔️-d
For a given nominal pipe size, as the wall thickness of the pipe increases, the:
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,a. Bore of the pipe increases
b. Weight of the pipe decreases
c. Outside diameter increases
d. Inside diameter is reduced - Correct Answer✔️✔️-d
All pipe weights with the same nominal pipe size have the same:
a. Mass per metre of length
b. Thickness
c. Outside diameter
d. Inside diameter - Correct Answer✔️✔️-c
One disadvantage of using threaded connections to join pipes and fittings is that it:
a. difficult to insulate
b. Requires the services of a pipe fitter
c. is more costly
d. Weakens the pipe - Correct Answer✔️✔️-d
When admitting steam to a steam piping system it is imperative to:
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
, a. Ensure drain valves are closed to prevent steam loss.
b. Add nitrogen to steam to prevent corrosion.
c. First ensure that no water exists or can accumulate in the piping.
d. Use the glycol tracing to warm the line. - Correct Answer✔️✔️-c
The valve that is least susceptible to wire drawing and seat erosion is the _________ valve.
Select one:
a. Globe
b. Gate
c. Plug
d. Wedge gate - Correct Answer✔️✔️-a
Expansion of piping is controlled by:
a. Installing spring supports on the pipe
b. Preheating the pipe prior to installation
c. Installing an expansion joint in the line
d. Anchoring the pipe at both ends to prevent movement - Correct Answer✔️✔️-c
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
