Top 250+ Solved Electromagnetic Theory MCQ Questions Answer
Q. Which of the following statement is true ?
a. The current in the discharging capacitor grows linearly
b. The current in the dicharging capacitor grows exponentially
c. The current in the discharging capacitor decays exponentially
d. The current in the discharging capacitor decreases constantly
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
Q. In a capacitor the electric charge is stored in
a. metal plates
b. dielectric
c. both (a) and (6)
d. none of the above
Q. Which of the following materials has the highest value of dielectric constant?
a. Glass
b. Vacuum
c. Ceramics
d. Oil
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
Q. Which of the following statements is incorrect ?
a. The leakage resistance of ceramic capacitors is generally high
b. The stored energy in a capacitor decreases with reduction in value of capacitance
c. The stored energy in a capacitor increases with applied voltage
d. A wire cable has distributed capacitance between the conductors
Q. Which of the following capacitors has relatively shorter shelf life ?
a. Mica capacitor
b. Electrolytic capacitor
c. Ceramic capacitor
d. Paper capacitor
Q. The sparking between two electrical contacts can be reduced by inserting a
a. capacitor in parallel with contacts
b. capacitor in series with each contact
c. resistance in line
d. none of the above
Q. In the case of a lossy capacitor, its series equivalent resistance value will be
a. small
b. very small
c. large
d. zero
Q. The power dissipated in a pure capacitor is
a. zero
b. proportional to applied voltage
c. proportional to value of capacitance
d. both (b) and (c) above
Q. In a capacitive circuit
a. a steady value of applied voltage causes discharge
b. an increase in applied voltage makes a capacitor charge
c. decrease in applied voltage makes a capacitor charge
d. none of the above
Q. When a dielectric slab is introduced in a parallel plate capacitor, the potential differencebetween plates will
a. remain uncharged
b. decrease
c. increase
d. become zero
Q. Capacitance increases with
a. increase in plate area and decrease in distance between the plates
b. increase in plate area and distance between the plates
c. decrease in plate area and value of applied voltage
d. reduction in plate area and distance between the plates