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All Electrical Engineering MCQs

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

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3041Electrical EngineeringMedium

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces________?

Anone of the above

Bthe more heat than produced by A.C. when flowing through the same circuit

Cthe same heat as produced by A.C. when flowing through the same circuit

Dthe less heat than produced by A.C. flowing through the same circuit

Correct answer

C. the same heat as produced by A.C. when flowing through the same circuit

Explanation

The correct answer is the same heat as produced by A.C. when flowing through the same circuit.

3042Electrical EngineeringMedium

Most of the linear ICs are based on the two-transistor differential amplifier because of its________?

Ahigh CMRR

Binput voltage dependent linear transfer characteristic

Chigh input resistance

Dhigh voltage gain

Correct answer

A. high CMRR

Explanation

The correct answer is high CMRR.

3043Electrical EngineeringMedium

Over charging________?

Aall above

Bincreases the temperature resulting in buckling of plates

Cloosens the active material

Dproduces excessive gassing

Correct answer

A. all above

Explanation

The correct answer is all above.

3044Electrical EngineeringMedium

The resistance of a conductor varies inversely as________?

Aresistivity

Btemperature

Carea of cross-section

Dlength

Correct answer

C. area of cross-section

Explanation

The correct answer is area of cross-section.

3045Electrical EngineeringMedium

A keeper is used to________?

Aprovide a closed path for flux

Brestore lost flux

Cchange the direction of magnetic lines

Damplify flux

Correct answer

A. provide a closed path for flux

Explanation

The correct answer is provide a closed path for flux.

3046Electrical EngineeringMedium

Due to which of the following fact, in India, aluminium is replacing copper?

AAluminium is more ductile and malleable than copper

BAluminium is available in plenty, cheaper and lighter than copper

CAluminium has less temperature co-efficient than copper

DAluminium has lower resistivity than that of copper

Correct answer

B. Aluminium is available in plenty, cheaper and lighter than copper

Explanation

The correct answer is Aluminium is available in plenty, cheaper and lighter than copper.

3047Electrical EngineeringMedium

“The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”. The above statement is associated with________?

AFaraday’s law

BLenz’s law

CGauss’s law

DKirchhoff s law

Correct answer

C. Gauss’s law

Explanation

The correct answer is Gauss’s law.

3048Electrical EngineeringMedium

At transition temperature the value of critical field is________?

Apositive real value

Bnegative real value

Ccomplex value

Dzero

Correct answer

D. zero

Explanation

The correct answer is zero.

3049Electrical EngineeringMedium

The electrode of a direct arc furnace is made of________?

Asilver

Bcopper

Ctungsten

Dgraphite

Correct answer

D. graphite

Explanation

The correct answer is graphite.

3050Electrical EngineeringMedium

For the parallel operation of two or more D.C. compound generators, we should ensure that________?

Aall conditions mentioned above should be satisfied

Ball the series fields should be run in parallel by means of equilizer connection

Cpolarity of incoming generator should be same as that of bus bar

Dseries fields of all generators should be either on positive side or negative side of the armature

Evoltage of the incoming generator should be same as that of bus bar

Correct answer

D. series fields of all generators should be either on positive side or negative side of the armature

Explanation

The correct answer is series fields of all generators should be either on positive side or negative side of the armature.

The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces________?

Anone of the above

Bthe more heat than produced by A.C. when flowing through the same circuit

Cthe same heat as produced by A.C. when flowing through the same circuit

Dthe less heat than produced by A.C. flowing through the same circuit

Correct answer

C. the same heat as produced by A.C. when flowing through the same circuit

Explanation

The correct answer is the same heat as produced by A.C. when flowing through the same circuit.

Due to which of the following fact, in India, aluminium is replacing copper?

AAluminium is more ductile and malleable than copper

BAluminium is available in plenty, cheaper and lighter than copper

CAluminium has less temperature co-efficient than copper

DAluminium has lower resistivity than that of copper

Correct answer

B. Aluminium is available in plenty, cheaper and lighter than copper

Explanation

The correct answer is Aluminium is available in plenty, cheaper and lighter than copper.

For the parallel operation of two or more D.C. compound generators, we should ensure that________?

Aall conditions mentioned above should be satisfied

Ball the series fields should be run in parallel by means of equilizer connection

Cpolarity of incoming generator should be same as that of bus bar

Dseries fields of all generators should be either on positive side or negative side of the armature

Evoltage of the incoming generator should be same as that of bus bar

Correct answer

D. series fields of all generators should be either on positive side or negative side of the armature

Explanation

The correct answer is series fields of all generators should be either on positive side or negative side of the armature.