Top 350+ Solved Electromagnetics MCQ Questions Answer
Q. Which of the following materials has the highest value of dielectric constant?
a. glass
b. vacuum
c. ceramics
d. oil
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
Q. A capacitor consists of
a. two insulators separated by a con¬ductor
b. two conductors separated by an in¬sulator
c. two insulators only
d. two conductors only
Q. A capacitor in a circuit became hot and ultimately exploded due to wrong con¬nections,which type of capacitor it could be ?
a. paper capacitor
b. ceramic capacitor
c. electrolytic capacitor
d. any-of the above
Q. Electric field intensity is a quantity
a. scalar
b. vector
c. both (a) and (6)
d. none of the above
Q. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
a. 2 joules
b. 4 joules
c. 6 joules
d. 8 joules
Q. The capacitor preferred for high frequency circuits is
a. air capacitor
b. mica capacitor
c. electrolytic capacitor
d. none of the above
Q. The capacity of capacitor bank used in power factor correction is expressed in terms of
a. kw
b. kva
c. kvar
d. volts
Q. While testing a capacitor with ohm-metre, if the capacitor shows charging, but the finalresistance reading is appreciably less than normal, it can be concluded that the capacitor is
a. short-circuited
b. open circuited
c. alright
d. leaky
Q. If a 6 (iF capacitor is charged to 200 V, the charge in coulombs will be
a. 800 uc
b. 900 uc
c. 1200 uc
d. 1600 uc
Q. Which capacitor will be physically smaller for the same ratings ?
a. ceramic capacitor
b. paper capacitor
c. both will be of equal size
d. none of the above
Q. What is the value of capacitance that must be connected in parallel with 50 pFcondenser to make an equivalent capacitance of 150 pF ?
a. 50 pf
b. 100 pf
c. 150 pf
d. 200 pf