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Electrostatics

Study 180 Electrical Engineering MCQs with correct answers and explanations.

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151Electrical EngineeringMedium

The power dissipated in a pure capacitor is________?

Aboth (B) and (C) above

Bzero

Cproportional to value of capacitance

Dproportional to applied voltage

Correct answer

B. zero

Explanation

The correct answer is zero.

152Electrical EngineeringMedium

A gang condenser is a________?

Avariable capacitor

Bnone of the above

Cpolarised capacitor

Dceramic capacitor

Correct answer

A. variable capacitor

Explanation

The correct answer is variable capacitor.

153Electrical EngineeringMedium

A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is________?

A0.8 s

B0.2 s

C0.4 s

D0.6 s

Correct answer

A. 0.8 s

Explanation

The correct answer is 0.8 s.

154Electrical EngineeringMedium

The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be________?

A400 N/C

B600 N/C

C1200 N/C

D800 N/C

Correct answer

D. 800 N/C

Explanation

The correct answer is 800 N/C.

155Electrical EngineeringMedium

The units of volume charge density are________?

AC/m

BC/m⁴

CC/m²

DC/m³

Correct answer

D. C/m³

Explanation

The correct answer is C/m³.

156Electrical EngineeringMedium

“The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed”. The above statement is associated with________?

AGauss’s law

BMaxwell’s first law

CMaxwell’s second law

DCoulomb’s square law

Correct answer

A. Gauss’s law

Explanation

The correct answer is Gauss’s law.

157Electrical EngineeringMedium

In a non-uniform electric field a polar molecule will experience________?

Azero

BNet force

CNet torque

Dboth series and parallel combinations

Correct answer

D. both series and parallel combinations

Explanation

The correct answer is both series and parallel combinations.

158Electrical EngineeringMedium

Which of the following capacitors can be used for temperature compensation?

ACeramic capacitor

BPaper capacitor

CNone of the above

DAir capacitor

Correct answer

A. Ceramic capacitor

Explanation

The correct answer is Ceramic capacitor.

159Electrical EngineeringMedium

Which of the following capacitor is preferred in case of single phase motor?

APaper capacitor

BCeramic capacitor

CMica capacitor

DElectrolytic capacitor

Correct answer

D. Electrolytic capacitor

Explanation

The correct answer is Electrolytic capacitor.

160Electrical EngineeringMedium

For a good 0.05 uF capacitor ohmmeter reading should________?

Ashow low resistance momentarily and back off to a very high resistance

Bnot move at all

Cgo quickly to 50 ohm approximately and remain there

Dshow high resistance momentarily and then a very low resistance

Correct answer

A. show low resistance momentarily and back off to a very high resistance

Explanation

The correct answer is show low resistance momentarily and back off to a very high resistance.

For a good 0.05 uF capacitor ohmmeter reading should________?

Ashow low resistance momentarily and back off to a very high resistance

Bnot move at all

Cgo quickly to 50 ohm approximately and remain there

Dshow high resistance momentarily and then a very low resistance

Correct answer

A. show low resistance momentarily and back off to a very high resistance

Explanation

The correct answer is show low resistance momentarily and back off to a very high resistance.