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All Electrical Engineering MCQs

Study 3,658 Electrical Engineering MCQs with correct answers and explanations.

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3151Electrical EngineeringMedium

Yokes with rectangular cross-section are used for________?

Aany of the above

Bmedium capacity transformers

Csmall capacity transformers

Dlarge capacity transformers

Correct answer

C. small capacity transformers

Explanation

The correct answer is small capacity transformers.

3152Electrical EngineeringMedium

In a D.C. machine, the value of peripheral speed should not, normally, exceed________?

A20 m/s

B40 m/s

C10 m/s

D30 m/s

Correct answer

D. 30 m/s

Explanation

The correct answer is 30 m/s.

3153Electrical EngineeringMedium

If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be________?

AR2IK2

BR22!K2

CR22/K

DR2/VK

Correct answer

A. R2IK2

Explanation

The correct answer is R2IK2.

3154Electrical EngineeringMedium

No-load on a transformer is carried out to determine________?

Aefficiency of the transformer

Bmagnetising current

Cmagnetising current and loss

Dcopper loss

Correct answer

C. magnetising current and loss

Explanation

The correct answer is magnetising current and loss.

3155Electrical EngineeringMedium

In an actual transformer the iron loss remains practically constant from no load to full load because:________?

Asecondary voltage remains constant

Bpermeability of transformer core remains constant

Cvalue of transformation ratio remains constant

Dcore flux remains practically constant

Eprimary voltage remains constant

Correct answer

D. core flux remains practically constant

Explanation

The correct answer is core flux remains practically constant.

3156Electrical EngineeringMedium

In Thevenin’s theorem, to find Z

Aall independent voltage sources are short circuited and all independent current sources are open circuited

Ball independent current sources are short circuited and independent voltage sources are open circuited

Call independent voltage sources are open circuited and all independent current sources are short circuited

Dall independent voltage and current sources are short circuited

Correct answer

A. all independent voltage sources are short circuited and all independent current sources are open circuited

Explanation

The correct answer is all independent voltage sources are short circuited and all independent current sources are open circuited.

3157Electrical EngineeringMedium

Primary winding of a transformer________?

Ais always a low voltage winding

Bcould either be a low voltage or high voltage winding

Cnone of the above

Dis always a high voltage winding

Correct answer

B. could either be a low voltage or high voltage winding

Explanation

The correct answer is could either be a low voltage or high voltage winding.

3158Electrical EngineeringMedium

Which of the following is an advantage of static capacitor for power factor improvement?

AEase in installation

BLittle maintenance cost

CAll of the above

DLow losses

Correct answer

C. All of the above

Explanation

The correct answer is All of the above.

3159Electrical EngineeringMedium

In a low power factor wattmeter the pressure coil is connected________?

Ain any of the two meters at connection

Bto the supply side of the current coil

Cnone of the above

Dto the load side of the current coil

Correct answer

D. to the load side of the current coil

Explanation

The correct answer is to the load side of the current coil.

3160Electrical EngineeringMedium

The on – state voltage drop of IGBT consists of________?

ADrop across the drift region

BDrop across MOSFET portion

CDrop across the collector junction

DAll of these

Correct answer

D. All of these

Explanation

The correct answer is All of these.

In an actual transformer the iron loss remains practically constant from no load to full load because:________?

Asecondary voltage remains constant

Bpermeability of transformer core remains constant

Cvalue of transformation ratio remains constant

Dcore flux remains practically constant

Eprimary voltage remains constant

Correct answer

D. core flux remains practically constant

Explanation

The correct answer is core flux remains practically constant.

In Thevenin’s theorem, to find Z

Aall independent voltage sources are short circuited and all independent current sources are open circuited

Ball independent current sources are short circuited and independent voltage sources are open circuited

Call independent voltage sources are open circuited and all independent current sources are short circuited

Dall independent voltage and current sources are short circuited

Correct answer

A. all independent voltage sources are short circuited and all independent current sources are open circuited

Explanation

The correct answer is all independent voltage sources are short circuited and all independent current sources are open circuited.