Top 350+ Solved Electromagnetics MCQ Questions Answer
Q. A mica capacitor and a ceramic capacitor both have the same physical dimensions.Which will have more value of capacitance ?
a. ceramic capacitor
b. mica capacitor
c. both will have identical value of capacitance
d. it depends on applied voltage
Q. Which of the following material has least value of dielectric constant ?
a. ceramics
b. oil
c. glass
d. paper
Q. Which of the following capacitors will have the least value of breakdown voltage ?
a. mica
b. paper
c. ceramic
d. electrolytic
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 temperature compensation ?
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 and placed at adistance 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 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 coupling and tuning.
a. air
b. mica
c. plastic film
d. ceramic