Top 250+ Solved Electromagnetic Field MCQ Questions Answer
Q. Which of the following capacitors is marked for polarity ?
a. Air
b. Paper
c. Mica
d. Electrolytic
Q. Which of the following capacitors can be used for temperaturecompensation ?
a. Air capacitor
b. Ceramic capacitor
c. Paper capacitor
d. None of the above
Q. Which of the following statements is incorrect ?
a. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .
b. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF
c. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combina¬tion
d. A capacitor can store charge be¬cause it has a dielectric between two conductors
Q. For closer tolerances which of the following capacitors is usually preferred ?
a. Paper capacitor
b. Mica capacitor
c. Ceramic disc capacitor
d. None of the above
Q. The electrostatic force between two charges of one coulomb each andplaced at distance of 0.5 m will be
a. 36 x 10fa
b. 36 x 107 N
c. 36 x 108 N
d. 36 x 109 N
Q. The units of volume charge density are
a. Coulomb/metre
b. Coulomb/metre
c. Coulomb/metre
d. Coulomb/metre
Q. "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
a. Gauss's law
b. Kirchhoff s law
c. Faraday's law
d. Lenz's law
Q. Dielectric strength of mica is
a. 10 to 20 kV/mm
b. 30 to 50 kV/mm
c. 50 to 200 kV/mm
d. 300 to 500 kV/mm
Q. The dielectric constant (relative permittivity) of glass is given by
a. 0.1 to 0.4
b. 0.5 to 1.0
c. 2.0 to 4.0
d. 5 to 100
Q. Capacitors are used for audio frequency and radio frequency couplingand tuning.
a. Air
b. Mica
c. Plastic film
d. Ceramic