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Electric Traction

Study 74 Electrical Engineering MCQs with correct answers and explanations.

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41Electrical EngineeringMedium

The resistance encountered by a train in motion is on account of________?

Aresistance offered by air

Ball of the above

Cfriction at various parts of the rolling stock

Dfriction at the track

Correct answer

B. all of the above

Explanation

The correct answer is all of the above.

42Electrical EngineeringMedium

When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when________?

Anone of the above

Bdegree of curvature is more

Cwheel base of axles is more

Dboth A. and B.

Correct answer

D. both A. and B.

Explanation

The correct answer is both A. and B..

43Electrical EngineeringMedium

Co-efficient of adhesion reduces due to the presence of which of the following?

Aboth B. and C.

BOil on the rails

CDew on rails

DSand on rails

Correct answer

A. both B. and C.

Explanation

The correct answer is both B. and C..

44Electrical EngineeringMedium

Which of the following state capitals is not on broad gauge track?

AChandigarh

BJaipur

CLucknow

DBhopal

Correct answer

B. Jaipur

Explanation

The correct answer is Jaipur.

45Electrical EngineeringMedium

Long distance railways use which of the following?

A25 kV two phase A.C.

B25 kV three phase A.C.

C200 V D.C.

D25 kV single phase A.C.

Correct answer

D. 25 kV single phase A.C.

Explanation

The correct answer is 25 kV single phase A.C..

46Electrical EngineeringMedium

Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction?

ATap changing control of transformer

BReduced current method

CSeries parallel operation of motors

DAll of the above

Correct answer

A. Tap changing control of transformer

Explanation

The correct answer is Tap changing control of transformer.

47Electrical EngineeringMedium

Specific energy consumption becomes________?

Amore with high train resistance

Ball of the above

Cmore on steeper gradient

Dless if distance between stops is more

Correct answer

B. all of the above

Explanation

The correct answer is all of the above.

48Electrical EngineeringMedium

Vacuum is created by which of the following?

AAny of the above

BNone of the above

CEjector

DVacuum pump

Correct answer

A. Any of the above

Explanation

The correct answer is Any of the above.

49Electrical EngineeringMedium

Co-efficient of adhesion is________-?

Alow in case of D.C. traction than in the case of AC. traction

Bequal in both AC. and D.C. traction

Cany of the above

Dhigh in case of D.C. traction than in the case of AC. traction

Correct answer

A. low in case of D.C. traction than in the case of AC. traction

Explanation

The correct answer is low in case of D.C. traction than in the case of AC. traction.

50Electrical EngineeringMedium

The overall efficiency of steam locomotive is around________?

A25 to 35 percent

B35 to 45 percent

C15 to 20 percent

D5 to 10 percent

Correct answer

D. 5 to 10 percent

Explanation

The correct answer is 5 to 10 percent.

Co-efficient of adhesion is________-?

Alow in case of D.C. traction than in the case of AC. traction

Bequal in both AC. and D.C. traction

Cany of the above

Dhigh in case of D.C. traction than in the case of AC. traction

Correct answer

A. low in case of D.C. traction than in the case of AC. traction

Explanation

The correct answer is low in case of D.C. traction than in the case of AC. traction.