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All Electrical Engineering MCQs

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

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331Electrical EngineeringMedium

While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is________?

Aalright

Bopen circuited

Cleaky

Dshort-circuited

Correct answer

C. leaky

Explanation

The correct answer is leaky.

332Electrical EngineeringMedium

If a D.C. generator fails to build up the probable cause could not be________?

Afield resistance less than the critical resistance

Bimperfect brush contact

Cfaulty shunt connections tending to reduce the residual magnetism

Dno residual magnetism in the generator

Correct answer

A. field resistance less than the critical resistance

Explanation

The correct answer is field resistance less than the critical resistance.

333Electrical EngineeringMedium

The ideal OP-AMP has the following characteristics

ARi=∞,A=∞,R0=0

BRi=∞,A=∞,R0=∞

CRi=0,A=∞,R0=∞

DRi=0,A=∞,R0=0

Correct answer

A. Ri=∞,A=∞,R0=0

Explanation

The correct answer is Ri=∞,A=∞,R0=0.

334Electrical EngineeringMedium

Bulbs in street lighting are all connected in________?

Aparallel

Bend-to-end

Cseries-parallel

Dseries

Correct answer

A. parallel

Explanation

The correct answer is parallel.

335Electrical EngineeringMedium

An H.R.C. fuse is________?

Aa heavy cross-section of copper or aluminium

Ba wire of platinum

Ca ceramic body having metal and caps

Da ceramic tube having carbon rod inside it

Correct answer

C. a ceramic body having metal and caps

Explanation

The correct answer is a ceramic body having metal and caps.

336Electrical EngineeringMedium

Power for lighting in passanger coach, in a long distance electric train, is provided________?

Athrough individual generator of bogie and batteries

Bthrough rails

Cthrough locomotive

Ddirectly through overhead electric line

Correct answer

A. through individual generator of bogie and batteries

Explanation

The correct answer is through individual generator of bogie and batteries.

337Electrical EngineeringMedium

“Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances”. This statement is associated with:

AMaximum power transfer theorem

BNone of the above

CMillman’s theorem

DThevenin’s theorem

Correct answer

C. Millman’s theorem

Explanation

The correct answer is Millman’s theorem.

338Electrical EngineeringMedium

A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is________?

A1000 ohms

B5000 ohms

C500 ohms

D50 ohms

Correct answer

B. 5000 ohms

Explanation

The correct answer is 5000 ohms.

339Electrical EngineeringMedium

An SCR is considered to be a semi controlled device because________?

Ait can be turned OFF but not ON with a gate pulse.

Bit can be turned ON only during one half cycle of an AC.

Cit can be turned ON but not OFF with a gate pulse.

Dit conducts only during one half cycle of an alternating current wave.

Correct answer

C. it can be turned ON but not OFF with a gate pulse.

Explanation

The correct answer is it can be turned ON but not OFF with a gate pulse..

340Electrical EngineeringMedium

In D.C. generators the polarity of the interpoles________?

Ais the same as that of the immediately preceding pole

Bis the same as that of the main pole ahead

Cis opposite to that of the main pole ahead

Dis neutral as these poles do not play part in generating e.m.f.

Correct answer

B. is the same as that of the main pole ahead

Explanation

The correct answer is is the same as that of the main pole ahead.

If a D.C. generator fails to build up the probable cause could not be________?

Afield resistance less than the critical resistance

Bimperfect brush contact

Cfaulty shunt connections tending to reduce the residual magnetism

Dno residual magnetism in the generator

Correct answer

A. field resistance less than the critical resistance

Explanation

The correct answer is field resistance less than the critical resistance.

An SCR is considered to be a semi controlled device because________?

Ait can be turned OFF but not ON with a gate pulse.

Bit can be turned ON only during one half cycle of an AC.

Cit can be turned ON but not OFF with a gate pulse.

Dit conducts only during one half cycle of an alternating current wave.

Correct answer

C. it can be turned ON but not OFF with a gate pulse.

Explanation

The correct answer is it can be turned ON but not OFF with a gate pulse..

In D.C. generators the polarity of the interpoles________?

Ais the same as that of the immediately preceding pole

Bis the same as that of the main pole ahead

Cis opposite to that of the main pole ahead

Dis neutral as these poles do not play part in generating e.m.f.

Correct answer

B. is the same as that of the main pole ahead

Explanation

The correct answer is is the same as that of the main pole ahead.