# Capacitance MCQ Questions with brief Explanatory Answers

Multiple choice questions on capacitance with brief explanatory answers.

## Which of following is relationship of capacitance of a capacitor to relative permittivity

Which of following is relationship of capacitance of a capacitor to relative permittivity

1. Capacitance is directly proportional relative permittivity
2. Capacitance is inversely proportional
3. Capacitance is directly proportional to cube of
4. Capacitance is directly proportional to square of

Correct answer: 1. Capacitance is directly proportional relative permittivity

## A capacitor opposes against change in which of following electrical properties

A capacitor opposes against change in which of following electrical properties

1. Change in current
2. Change in voltage
3. Both of these
4. None of the above

Correct answer: 2. Change in voltage

## It is desired to increase the capacitance of a parallel-plate capacitor. Which of following sheet should be introduced between the plates of the capacitor

It is desired to increase the capacitance of a parallel-plate capacitor. Which of following sheet should be introduced between the plates of the capacitor

1. Copper
2. Stainless steel
3. Mica
4. Tin

## What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart

What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart

1. P.d. Will decrease
2. P.d. Will increase
3. P.d. Will remain unchanged
4. None of above

Correct answer: 2. P.d. Will increase

## Assuming the capacitance of earth to be a spherical conductor of radius 6400 km is

Assuming the capacitance of earth to be a spherical conductor of radius 6400 km is

1. 711 µF
2. 644 µF
3. 2000 µF
4. 200 µF

Derivation for above starts at 8:00 in below video:

## A leakage capacitor can be represented using a capacitance C and resistance R in parallel C

A leakage capacitor can be represented using a capacitance C and resistance R in parallel C:

1. False
2. True

## Capacitance grading of cable involves

1. Grading according to capacitance of cables per km length
2. Cables using single dielectric in different concentrations
3. Capacitance required to be introduced at different lengths to counter the effect of inductance
4. Use of dielectrics of different permeability values

Correct answer: 4. Use of dielectrics of different permeability values

## If length of a cable is doubled, its capacitance

If length of a cable is doubled, its capacitance:

1. Becomes double
2. Becomes one-fourth
3. Remains unchanged
4. Becomes one-half

## Which of following dielectric is used in capacitance grading of cables

1. Which of following dielectric is used in capacitance grading of cables:
1. Porous dielectric
2. Composite dielectric
3. Hygroscopic dielectric
4. Homogeneous dielectric