Practice high-yield Electrical Engineering MCQs on Electric Traction — Part 2 with worked academic solutions for WAPDA, NTDC, IESCO, LESCO, PPSC, FPSC.
Questions
39
Difficulty Level
Exam-Level
Target Exams
WAPDA, NTDC, IESCO...
Estimated Time
47 mins
Exam-Level WAPDA NTDC IESCO LESCO PPSC FPSC
Verified for Commission Syllabus • Oct 14, 2026
39
Verified Practice Questions
Interactive test mode with detailed academic worked solutions
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🎉 Set complete! All 39 questions answered.
Question 1 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Automatic signaling is used for which of the following trains?
Correct Answer: Option B — Superfast trains
Detailed Academic Explanation:
Superfast trains is the correct answer to “Automatic signaling is used for which of the following trains”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 2 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In case of steam engines the steam pressure is
Correct Answer: Option C — 10 to 15 kgf/cm2
Detailed Academic Explanation:
10 to 15 kgf/cm2 is the correct answer to “In case of steam engines the steam pressure is”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 3 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The resistance encountered by a train in motion is on account of
Correct Answer: Option D — All of the above
Detailed Academic Explanation:
All of the above is the correct answer to “The resistance encountered by a train in motion is on account of”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 4 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In case of a steam engine an average coal consumption per km is nearly
Correct Answer: Option D — 28 to 30 kg
Detailed Academic Explanation:
28 to 30 kg is the correct answer to “In case of a steam engine an average coal consumption per km is nearly”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 5 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The friction at the track is proportional to
Correct Answer: Option C — Speed
Detailed Academic Explanation:
Speed is the correct answer to “The friction at the track is proportional to”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 6 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when
Correct Answer: Option C — Both (A) and (B)
Detailed Academic Explanation:
Both (A) and (B) is the correct answer to “When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 7 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The overall efficiency of steam locomotive is around
Correct Answer: Option A — 5 to 10 percent
Detailed Academic Explanation:
5 to 10 percent is the correct answer to “The overall efficiency of steam locomotive is around”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 8 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
For which of the following locomotives the maintenance requirements are the least?
Correct Answer: Option B — Diesel locomotives
Detailed Academic Explanation:
Diesel locomotives is the correct answer to “For which of the following locomotives the maintenance requirements are the least”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 9 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Methods can bring the locomotive to dead stop.
Correct Answer: Option A — Plugging braking
Detailed Academic Explanation:
Plugging braking is the correct answer to “Methods can bring the locomotive to dead stop.”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 10 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following state capitals (in India) is not on broad gauge track?
Correct Answer: Option C — Jaipur
Detailed Academic Explanation:
Jaipur is the correct answer to “Which of the following state capitals (in India) is not on broad gauge track”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 11 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The air resistance to the movement of the train is proportional to
Correct Answer: Option B — (Speed)2
Detailed Academic Explanation:
(Speed)2 is the correct answer to “The air resistance to the movement of the train is proportional to”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 12 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following braking systems is used on steam locomotives?
Correct Answer: Option C — Vacuum system
Detailed Academic Explanation:
Vacuum system is the correct answer to “Which of the following braking systems is used on steam locomotives”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 13 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
An ideal traction system should have
Correct Answer: Option D — All of the above
Detailed Academic Explanation:
All of the above is the correct answer to “An ideal traction system should have”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 14 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Locomotive having mono-motor bogies
Correct Answer: Option D — Has all above qualities
Detailed Academic Explanation:
Has all above qualities is the correct answer to “Locomotive having mono-motor bogies”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 15 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction?
Correct Answer: Option B — Tap changing control of transformer
Detailed Academic Explanation:
Tap changing control of transformer is the correct answer to “Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 16 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The efficiency of diesel locomotives is nearly
Correct Answer: Option A — 20 to 25 percent
Detailed Academic Explanation:
20 to 25 percent is the correct answer to “The efficiency of diesel locomotives is nearly”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 17 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
For three-phase induction motors which of the following is the least efficient method of speed control?
Correct Answer: Option C — Rheostat control
Detailed Academic Explanation:
Rheostat control is the correct answer to “For three-phase induction motors which of the following is the least efficient method of speed control”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 18 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following is the advantage of electric braking?
Correct Answer: Option A — It avoids wear of track
Detailed Academic Explanation:
It avoids wear of track is the correct answer to “Which of the following is the advantage of electric braking”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 19 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Speed-time curve of main line service differs from those of urban and suburban services on following account
Correct Answer: Option D — All of the above
Detailed Academic Explanation:
All of the above is the correct answer to “Speed-time curve of main line service differs from those of urban and suburban services on following account”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 20 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Locomotives with monometer bogies have
Correct Answer: Option B — Suitability for passenger as well as freight service
Detailed Academic Explanation:
Suitability for passenger as well as freight service is the correct answer to “Locomotives with monometer bogies have”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 21 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In case of locomotives the tractive power is provided by
Double cylinder, double acting steam engine is the correct answer to “In case of locomotives the tractive power is provided by”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 22 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Watt-hours per tonne km is usually the specific energy consumption for suburban services.
Correct Answer: Option B — 50 - 75
Detailed Academic Explanation:
50 - 75 is the correct answer to “Watt-hours per tonne km is usually the specific energy consumption for suburban services.”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 23 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The steam engine provided on steam locomotives is
Correct Answer: Option B — Single acting non-condensing type
Detailed Academic Explanation:
Single acting non-condensing type is the correct answer to “The steam engine provided on steam locomotives is”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 24 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The horsepower of steam locomotives is
Correct Answer: Option A — Up to 1500
Detailed Academic Explanation:
Up to 1500 is the correct answer to “The horsepower of steam locomotives is”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 25 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to
Correct Answer: Option B — 10
Detailed Academic Explanation:
10 is the correct answer to “The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 26 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Overload capacity of diesel engines is usually restricted to
Correct Answer: Option A — 2 percent
Detailed Academic Explanation:
2 percent is the correct answer to “Overload capacity of diesel engines is usually restricted to”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 27 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Suri transmission is
Correct Answer: Option C — Hydro mechanical
Detailed Academic Explanation:
Hydro mechanical is the correct answer to “Suri transmission is”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 28 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following is the disadvantage of electric traction over other systems of traction?
Correct Answer: Option C — High capital outlay in fixed installations beside route limitation
Detailed Academic Explanation:
High capital outlay in fixed installations beside route limitation is the correct answer to “Which of the following is the disadvantage of electric traction over other systems of traction”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 29 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
_______ was the first city in India to adopt electric traction.
Correct Answer: Option D — Bombay (Mumbai)
Detailed Academic Explanation:
Bombay (Mumbai) is the correct answer to “_______ was the first city in India to adopt electric traction.”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 30 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The rate of acceleration on sub-urban or urban services is restricted by the consideration of
Correct Answer: Option C — Passenger Discomfort
Detailed Academic Explanation:
Passenger Discomfort is the correct answer to “The rate of acceleration on sub-urban or urban services is restricted by the consideration of”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 31 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In India, electrification of railway track was done for the first time in which of the following years?
Correct Answer: Option C — 1925 - 1932
Detailed Academic Explanation:
1925 - 1932 is the correct answer to “In India, electrification of railway track was done for the first time in which of the following years”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 32 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
_________ locomotive has the highest operational availability.
Correct Answer: Option A — Electric
Detailed Academic Explanation:
Electric is the correct answer to “_________ locomotive has the highest operational availability.”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 33 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The return circuit for tram cars is through
Correct Answer: Option B — Rails
Detailed Academic Explanation:
Rails is the correct answer to “The return circuit for tram cars is through”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 34 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
________ have maximum unbalanced forces
Correct Answer: Option B — Steam locomotives
Detailed Academic Explanation:
Steam locomotives is the correct answer to “________ have maximum unbalanced forces”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 35 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The braking retardation is usually in the range
Correct Answer: Option D — 3 to 5 km phps
Detailed Academic Explanation:
3 to 5 km phps is the correct answer to “The braking retardation is usually in the range”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 36 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails?
Correct Answer: Option D — 0.16
Detailed Academic Explanation:
0.16 is the correct answer to “If the coefficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 37 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The rate of acceleration on suburban or urban service is in the range
Correct Answer: Option B — 1.6 to 4.0 km phps
Detailed Academic Explanation:
1.6 to 4.0 km phps is the correct answer to “The rate of acceleration on suburban or urban service is in the range”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 38 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In tram ways which of the following motors is used?
Correct Answer: Option B — D.C. series motor
Detailed Academic Explanation:
D.C. series motor is the correct answer to “In tram ways which of the following motors is used”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
Question 39 of 39
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following drives is suitable for mines where explosive gas exists?
Correct Answer: Option C — Battery locomotive
Detailed Academic Explanation:
Battery locomotive is the correct answer to “Which of the following drives is suitable for mines where explosive gas exists”. This question is standard in competitive examination syllabi for Electric Traction.
💡Key Conceptual Anchor:Electric Traction
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A_C Fundamentals_ Circuits And Circuit Theory — Part 1
Master the next curriculum module with 40 exam-standard MCQs.
In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.