Top 250+ Solved Electromagnetic Field MCQ Questions Answer

From 181 to 195 of 224

Q. A dielectric material must be

a. Resistor

b. Insulator

c. Good conductor

d. Semi conductor

  • b. Insulator

Q. An electrolytic capacitor can be used for

a. D.C. only

b. AC .only

c. Both

d. C. as well as A.C.

  • a. D.C. only

Q. The capacitance of a capacitor is not affected by

a. Distance between plates

b. Area of plates

c. Thickness of plates

d. All of the above

  • c. Thickness of plates

Q. Which of the following is not a vector?

a. Linear momentum

b. Angular momentum

c. Electric field

d. Electric potential

  • a. Linear momentum

Q. Two plates of parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the

a. Voltage across the plates inceases

b. Voltage across the plates decreases

c. Charge on the capacitor decreases

d. Charge on the capacitor increases

  • b. Voltage across the plates decreases

Q. If A.C. voltage is applied to capacititve circuit , th alternating currentcan flow in the circuit because

a. Varying voltage produces the charging and discharging currents

b. Of high peak value

c. Discharge current can flow

d. Charging current can flow

  • a. Varying voltage produces the charging and discharging currents

Q. Which of the following statements is correct?

a. Air capacitors have a blackband to indicate the outside foil

b. Electrolytic capacitor must be connected in the correct polarity

c. Ceramic capacitors must be connected in the correct polarity

d. Mica capacitors are available in capacitance value of 1 to 10 pf

  • b. Electrolytic capacitor must be connected in the correct polarity

Q. The dissipation factor of good dielectric is of the order of

a. 0.0002

b. 0.002

c. 0.02

d. 0.2

  • a. 0.0002

Q. “ the total electric flux through any closed surface surroundingcharges is equal to the amount of charge enclosed “.

a. Coulomb’s square law

b. Gauss’s law

c. Maxwell’s first law

d. Maxwell’s second law

  • b. Gauss’s law

Q. Which of the following statement is true?

a. The current in the discharging capacitor grows linearly

b. The current in the discharging capacitor grows exponentially

c. The current in the discharging capacitor decays exponentially

d. The current in the discharging capacitor decreases constantally

  • b. The current in the discharging capacitor grows exponentially

Q. Which of the following expression is correct for electric field strength?

a. E = D/E

b. E = D2/t

c. E = jtD

d. E = nD2

  • a. E = D/E

Q. In a capacitor the electric charge is stored in

a. Glass

b. Vacuum

c. Ceramics

d. Oils

  • c. Ceramics

Q. Which of the following capacitors will have the least variation?

a. Paper capacitor

b. Ceramic capacitor

c. Silver plated mica capacitor

d. None of the above

  • c. Silver plated mica capacitor
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