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Transmission and Distribution

Study 90 Electrical Engineering MCQs with correct answers and explanations.

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71Electrical EngineeringMedium

The square root of the ratio of line impedance and shunt admittance is called the________?

Anone of the above

Bsurge impedance of the line

Cconductance of the line

Dregulation of the line

Correct answer

B. surge impedance of the line

Explanation

The correct answer is surge impedance of the line.

72Electrical EngineeringMedium

For which of the following equipment current rating is not necessary?

AIsolators

BCircuit breakers and load break switches

CLoad break switch

DCircuit breakers

Correct answer

A. Isolators

Explanation

The correct answer is Isolators.

73Electrical EngineeringMedium

The steel used in steel cored conductors is usually________?

Aalloy steel

Bmild steel

Call of the above

Dstainless steel

Ehigh speed steel

Correct answer

B. mild steel

Explanation

The correct answer is mild steel.

74Electrical EngineeringMedium

Overhead lines generally use________?

Aall aluminium conductors

Bnone of these

CA.C.S.R. conductors

Dcopper conductors

Correct answer

C. A.C.S.R. conductors

Explanation

The correct answer is A.C.S.R. conductors.

75Electrical EngineeringMedium

Owing to skin effect:

Aportion of the conductor near the surface carries more current and core of the conductor carries less current

Bportion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent

Cany of the above

Dcurrent flows through the half cross-section of the conductor

Enone of the above

Correct answer

A. portion of the conductor near the surface carries more current and core of the conductor carries less current

Explanation

The correct answer is portion of the conductor near the surface carries more current and core of the conductor carries less current.

76Electrical EngineeringMedium

The operating voltage of high voltage cables is up to________?

A6.6kV

B3.3kV

CllkV

Dl.lkV

Correct answer

C. llkV

Explanation

The correct answer is llkV.

77Electrical EngineeringMedium

A booster is a________?

Ashunt wound generator

Bnone of the above

Cseries wound generator

Dsynchronous generator

Correct answer

C. series wound generator

Explanation

The correct answer is series wound generator.

78Electrical EngineeringMedium

Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is________?

A75 percent

B50 percent

C100 percent

D25 percent

Correct answer

B. 50 percent

Explanation

The correct answer is 50 percent.

79Electrical EngineeringMedium

The minimum clearance between the ground and a 220 kV line is about________?

A5.5 m

B10.5 m

C7.0 m

D4.3 m

Correct answer

C. 7.0 m

Explanation

The correct answer is 7.0 m.

80Electrical EngineeringMedium

The skin effect of a conductor will reduce as the________?

Afrequency increases

Bdiameter increases

Cresistivity of conductor material increases

Dpermeability of conductor material increases

Correct answer

C. resistivity of conductor material increases

Explanation

The correct answer is resistivity of conductor material increases.

Owing to skin effect:

Aportion of the conductor near the surface carries more current and core of the conductor carries less current

Bportion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent

Cany of the above

Dcurrent flows through the half cross-section of the conductor

Enone of the above

Correct answer

A. portion of the conductor near the surface carries more current and core of the conductor carries less current

Explanation

The correct answer is portion of the conductor near the surface carries more current and core of the conductor carries less current.