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Transmission and Distribution

Study 90 Electrical Engineering MCQs with correct answers and explanations.

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41Electrical EngineeringMedium

When the interconnector between two stations has large reactance?

Athe stations will fall out of step be¬cause of large angular displacement between the stations

Bthe transfer of power will take place with voltage fluctuation and noise

Cnone of the above

Dthe transfer of power will take place with least loss

Correct answer

A. the stations will fall out of step be¬cause of large angular displacement between the stations

Explanation

The correct answer is the stations will fall out of step be¬cause of large angular displacement between the stations.

42Electrical EngineeringMedium

For an overhead line, the surge impedance is taken as________?

Anone of the above

B20-30 ohms

C70—80 ohms

D500—1000 ohms

E100—200 ohms

Correct answer

E. 100—200 ohms

Explanation

The correct answer is 100—200 ohms.

43Electrical EngineeringMedium

The power factor of industrial loads is generally________?

Aunity

Bzero

Clagging

Dleading

Correct answer

C. lagging

Explanation

The correct answer is lagging.

44Electrical EngineeringMedium

jCorona usually occurs when the electrostatic stress in air around the conductor exceeds?

A6.6 kV (r.m.s. value)/cm

B22 kV (maximum value)/cm

C30 kV (maximum value)/cm

D11 kV (r.m.s. value)/cm

Correct answer

C. 30 kV (maximum value)/cm

Explanation

The correct answer is 30 kV (maximum value)/cm.

45Electrical EngineeringMedium

In a tap changing transformer, the tappings are provided on________?

Aany of the above

Bsecondary winding

Cprimary winding

Dhigh voltage winding

Correct answer

D. high voltage winding

Explanation

The correct answer is high voltage winding.

46Electrical EngineeringMedium

Large industrial consumers are supplied electrical energy at________?

A11 kV

B66 kV

C400 kV

D400 V

Correct answer

A. 11 kV

Explanation

The correct answer is 11 kV.

47Electrical EngineeringMedium

The use of strain type insulators is made where the conductors are________?

Aat intermediate anchor towers

Bdead ended

Cnone of the above

Dany of the above

Correct answer

D. any of the above

Explanation

The correct answer is any of the above.

48Electrical EngineeringMedium

Series capacitors on transmission lines are of little use when the load VAR requirement is________?

Afluctuating

Bany of the above

Clarge

Dsmall

Correct answer

D. small

Explanation

The correct answer is small.

49Electrical EngineeringMedium

There is a greater possibility of occurence of corona during________?

Awinter

Bnone of the above

Chumid weather

Dsummer heat

Edry weather

Correct answer

C. humid weather

Explanation

The correct answer is humid weather.

50Electrical EngineeringMedium

In aluminium conductors, steel core is provided to________?

Aneutralise proximity effect

Bincrease the tensile strength

Ccompensate for skin effect

Dreduce line inductance

Correct answer

B. increase the tensile strength

Explanation

The correct answer is increase the tensile strength.

When the interconnector between two stations has large reactance?

Athe stations will fall out of step be¬cause of large angular displacement between the stations

Bthe transfer of power will take place with voltage fluctuation and noise

Cnone of the above

Dthe transfer of power will take place with least loss

Correct answer

A. the stations will fall out of step be¬cause of large angular displacement between the stations

Explanation

The correct answer is the stations will fall out of step be¬cause of large angular displacement between the stations.