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All Electrical Engineering MCQs

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

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1891Electrical EngineeringMedium

Secondary air is the air used to________?

Areduce the flame length

Bincrease the flame length

Cprovide air round the burners for getting optimum combustion

Dtransport and dry the coal

Correct answer

C. provide air round the burners for getting optimum combustion

Explanation

The correct answer is provide air round the burners for getting optimum combustion.

1892Electrical EngineeringMedium

When current flows through heater coil it glows but supply wiring does not glow because________?

Asupply wiring is covered with insulation layer

Bsupply wires are made of superior material

Cresistance of heater coil is more than the supply wires

Dcurrent through supply line flows at slower speed

Correct answer

C. resistance of heater coil is more than the supply wires

Explanation

The correct answer is resistance of heater coil is more than the supply wires.

1893Electrical EngineeringMedium

In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except________?

Adummy coils

Bcompensating winding

Cshifting of axis of brushes

Dinterpoles

Correct answer

A. dummy coils

Explanation

The correct answer is dummy coils.

1894Electrical EngineeringMedium

In case of impulse steam turbine________?

Anone of the above

Bthere is enthalpy drop only in moving blades

Cthere is enthalpy drop in fixed and moving blades

Dthere is enthalpy drop in nozzles

Correct answer

D. there is enthalpy drop in nozzles

Explanation

The correct answer is there is enthalpy drop in nozzles.

1895Electrical EngineeringMedium

The capacity of a lead-acid cell does not depend on its________?

Arate of charge

Btemperature

Crate of discharge

Dquantity of active material

Correct answer

A. rate of charge

Explanation

The correct answer is rate of charge.

1896Electrical EngineeringMedium

A transformer cannot raise or lower the voltage of a D.C. supply because________?

Anone of the above

BFaraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

Ca D.C. circuit has more losses

Dthere is no need to change the D.C. voltage

Correct answer

B. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

Explanation

The correct answer is Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero.

1897Electrical EngineeringMedium

The transient response, with feedback system________?

Adecays slowly

Brises slowly

Cdecays quickly

Drises quickly

Correct answer

C. decays quickly

Explanation

The correct answer is decays quickly.

1898Electrical 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.

1899Electrical EngineeringMedium

A MOSFET uses the electric field of a ________to control the channel current?

Agenerator

Bbattery

Cnone of the above

Dcapacitor

Correct answer

D. capacitor

Explanation

The correct answer is capacitor.

1900Electrical EngineeringMedium

When two D.C. series motors are connected in parallel, the resultant speed is________?

Azero

Bloss than the normal speed

Cmore than the normal speed

Dnormal speed

Correct answer

D. normal speed

Explanation

The correct answer is normal speed.

Secondary air is the air used to________?

Areduce the flame length

Bincrease the flame length

Cprovide air round the burners for getting optimum combustion

Dtransport and dry the coal

Correct answer

C. provide air round the burners for getting optimum combustion

Explanation

The correct answer is provide air round the burners for getting optimum combustion.

When current flows through heater coil it glows but supply wiring does not glow because________?

Asupply wiring is covered with insulation layer

Bsupply wires are made of superior material

Cresistance of heater coil is more than the supply wires

Dcurrent through supply line flows at slower speed

Correct answer

C. resistance of heater coil is more than the supply wires

Explanation

The correct answer is resistance of heater coil is more than the supply wires.

A transformer cannot raise or lower the voltage of a D.C. supply because________?

Anone of the above

BFaraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

Ca D.C. circuit has more losses

Dthere is no need to change the D.C. voltage

Correct answer

B. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

Explanation

The correct answer is Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero.