# Capacitance MCQ Questions Answers Electrical Engineering

## Electrical Engineering Capacitance MCQ Questions Answers

1) 64 drops of radius ‘r’ combine to form a bigger drop of radius R. The ratio of capacitances of bigger to smaller drop is

a) 1 : 4

b) 2 : 1

c) 1 : 2

d) 4 : 1

2) A capacitor of 100 pF is charged to 100 V. The charge accumulated on the plates of the capacitor is

a) 10‑6C

b) 6 x 10-2 C

c) 10-8C

d) 6 x 10-4 C

3) The charging of a capacitor through a resistance follows

a) linear law

b) square law

c) exponential law

d) none of the above

4) In a variable capacitor, the dielectric used is generally

a) air

b) solid

c) electrolyte

d) none of the above

5) A gang capacitor is a variable capacitor in which capacitance is changed by changing

a) distance between plates

b) plate area

c) both a and b

d) dielectric

6) An RC series circuit is connected to a 300 V d.c source. The voltage across the capacitor after 1 time constant is

a) 200 V

b) 126.5 V

c) 170.2 V

d) 189.6 V

7) A trimmer  is a variable capacitor in which capacitance is changed by changing

a) distance between plates

b) plate area

c) both a and b

d) dielectric

8) When the total charge in a capacitor is doubled, the energy stored

a) remains the same

b) is doubled

c) is halved

9) Two indentical capacitors are connected in parallel and changed to a potential of V. They are separated and then connected in series. The p.d. across series combination is

a) V

b) 4V

c) 3V

d) 2V