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All Electrical Engineering MCQs

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

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811Electrical EngineeringMedium

Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?

AThe speed of that generator is increased

BThe field of that generator is weakened

CThat generator takes large share of loads

DThe direction of that generator is reversed

Correct answer

C. That generator takes large share of loads

Explanation

The correct answer is That generator takes large share of loads.

812Electrical EngineeringMedium

Pin type insulators are generally not used for voltages beyond________?

A1 kV

B11 kV

C33 kV

D22 kV

Correct answer

C. 33 kV

Explanation

The correct answer is 33 kV.

813Electrical EngineeringMedium

A common-mode signal is applied to ________?

Athe noninverting input

Btop of the tail resistor

Cboth iputs

Dthe inverting input

Correct answer

C. both iputs

Explanation

The correct answer is both iputs.

814Electrical EngineeringMedium

The main disadvantage of a mechanical switch is that it________?

AIs operated mechanically

BHas high inertia

CNone of the above

DIs costly

Correct answer

B. Has high inertia

Explanation

The correct answer is Has high inertia.

815Electrical EngineeringMedium

Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is________?

A1.6 x 1015 m/s2

B1.76 x 1015 m/s2

C0.56 x 1015 m/s2

D1.5 x 1015 m/s2

Correct answer

B. 1.76 x 1015 m/s2

Explanation

The correct answer is 1.76 x 1015 m/s2.

816Electrical EngineeringMedium

A JFET has high input impedance because ________?

Ait is made of semiconductor material

Bof impurity atoms

Cnone of the above

Dinput is reverse biased

Correct answer

D. input is reverse biased

Explanation

The correct answer is input is reverse biased.

817Electrical EngineeringMedium

In a certain three-branch parallel circuit, R1 has 12 mA through it, R2 has 15 mA through it, and R3 has 25 mA through it. After measuring a total of 27 mA, you can say that________?

Athe circuit is operating properly

BR3 is open

CR2 is open

DR1 is open

Correct answer

B. R3 is open

Explanation

The correct answer is R3 is open.

818Electrical EngineeringMedium

MOSFET stands for________?

AMetal – oxide semiconductor field effect transmitter

BMetal – oxide silicon field effect transistor

CMolybdenum – oxide semiconductor field effect transistor

DMetal – oxide semiconductor field effect transistor

Correct answer

D. Metal – oxide semiconductor field effect transistor

Explanation

The correct answer is Metal – oxide semiconductor field effect transistor.

819Electrical EngineeringMedium

For 275 kV transformers, using cold rolled grain oriented steel, which of the following values of flux density may be used?

A1.3 Wb/m2

BNone of the above

C1.1 Wb/m2

D1.0 Wb/m2

E1.6 Wb/m2

Correct answer

E. 1.6 Wb/m2

Explanation

The correct answer is 1.6 Wb/m2.

820Electrical EngineeringMedium

The minimum charge on an ion is________?

Aequal to the charge of an electron

Bequal to the atomic number of the atom

Cequal to the charge of the number of electrons in an atom (#) zero

Correct answer

A. equal to the charge of an electron

Explanation

The correct answer is equal to the charge of an electron.

Two generators are running in parallel. One of the generators may run as motor for which of the following reasons?

AThe speed of that generator is increased

BThe field of that generator is weakened

CThat generator takes large share of loads

DThe direction of that generator is reversed

Correct answer

C. That generator takes large share of loads

Explanation

The correct answer is That generator takes large share of loads.

MOSFET stands for________?

AMetal – oxide semiconductor field effect transmitter

BMetal – oxide silicon field effect transistor

CMolybdenum – oxide semiconductor field effect transistor

DMetal – oxide semiconductor field effect transistor

Correct answer

D. Metal – oxide semiconductor field effect transistor

Explanation

The correct answer is Metal – oxide semiconductor field effect transistor.