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Electrostatics

Study 180 Electrical Engineering MCQs with correct answers and explanations.

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141Electrical EngineeringMedium

If a charged rod is brought closer to a gas filled balloon then________?

ABalloon bursts

BBalloon squeezes

CRadius decreases

DRadius increase

Correct answer

D. Radius increase

Explanation

The correct answer is Radius increase.

142Electrical EngineeringMedium

In a cable capacitor, voltage gradient is maximum at the surface of the________?

Aconduction

Bsheath

Cinsulator

Dearth

Correct answer

A. conduction

Explanation

The correct answer is conduction.

143Electrical EngineeringMedium

Dielectric strength of mica is________?

A10 to 20 kV/mm

B300 to 500 kV/mm

C50 to 200 kV/mm

D30 to 50 kV/mm

Correct answer

C. 50 to 200 kV/mm

Explanation

The correct answer is 50 to 200 kV/mm.

144Electrical EngineeringMedium

The capacitance between two plates increases with________?

Ashorter plate area and shorter distance between them

Blarger plate area and shorter distance between plates

Cshorter plate area and higher applied voltage

Dlarger plate area, longer distance between plates and higher,applied voltage

Correct answer

B. larger plate area and shorter distance between plates

Explanation

The correct answer is larger plate area and shorter distance between plates.

145Electrical EngineeringMedium

If metallic conductor is charged negatively then its weight________?

ADecreases then increases

BRemains same

CIncreases for a while

DFirst increases then decreases

Correct answer

C. Increases for a while

Explanation

The correct answer is Increases for a while.

146Electrical EngineeringMedium

The inverse of capacitance is called________?

Asusceptance

Belastance

Creluctance

Dconductance

Correct answer

B. elastance

Explanation

The correct answer is elastance.

147Electrical EngineeringMedium

The units of capacitance are________?

Ahenry/Wb

Bohms

Cvolts/coulomb

Dcoulombs/volt

Correct answer

D. coulombs/volt

Explanation

The correct answer is coulombs/volt.

148Electrical 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.

149Electrical EngineeringMedium

Which of the following statements is incorrect?

AA six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

BCapacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

CA capacitor can store charge because it has a dielectric between two conductors

DThe thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor.

Correct answer

A. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

Explanation

The correct answer is A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF.

150Electrical EngineeringMedium

The number of Faraday tubes of flux passing through a surface in an electric field is called________?

Aelectric charge density

Bmagnetic flux density

Celectric flux density

Delectric flux

Correct answer

D. electric flux

Explanation

The correct answer is electric flux.

The capacitance between two plates increases with________?

Ashorter plate area and shorter distance between them

Blarger plate area and shorter distance between plates

Cshorter plate area and higher applied voltage

Dlarger plate area, longer distance between plates and higher,applied voltage

Correct answer

B. larger plate area and shorter distance between plates

Explanation

The correct answer is larger plate area and shorter distance between plates.

Which of the following statements is incorrect?

AA six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

BCapacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

CA capacitor can store charge because it has a dielectric between two conductors

DThe thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor.

Correct answer

A. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

Explanation

The correct answer is A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF.