Multiple choice questions on capacitance with brief explanatory answers.
Contents
- 1 Which of following is relationship of capacitance of a capacitor to relative permittivity
- 2 A capacitor opposes against change in which of following electrical properties
- 3 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
- 4 What happens to p.d, if plates of a charged parallel -plate capacitor are pulled apart
- 5 Assuming the capacitance of earth to be a spherical conductor of radius 6400 km is
- 6 A leakage capacitor can be represented using a capacitance C and resistance R in parallel C
- 7 Capacitance grading of cable involves
- 8 If length of a cable is doubled, its capacitance
- 9 Which of following dielectric is used in capacitance grading of cables
- 10 Static capacitors are rated in
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
- Capacitance is directly proportional relative permittivity
- Capacitance is inversely proportional
- Capacitance is directly proportional to cube of
- 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
- Change in current
- Change in voltage
- Both of these
- 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
- Copper
- Stainless steel
- Mica
- Tin
Correct answer: 3. Mica
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
- P.d. Will decrease
- P.d. Will increase
- P.d. Will remain unchanged
- 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
- 711 µF
- 644 µF
- 2000 µF
- 200 µF
Correct answer: 1. 711 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:
- False
- True
Correct answer: 2. True
Capacitance grading of cable involves
Capacitance grading of cable involves:
- Grading according to capacitance of cables per km length
- Cables using single dielectric in different concentrations
- Capacitance required to be introduced at different lengths to counter the effect of inductance
- 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:
- Becomes double
- Becomes one-fourth
- Remains unchanged
- Becomes one-half
Correct answer: 1. Becomes double
Which of following dielectric is used in capacitance grading of cables
- Which of following dielectric is used in capacitance grading of cables:
- Porous dielectric
- Composite dielectric
- Hygroscopic dielectric
- Homogeneous dielectric
Correct answer: 2. Composite dielectric
Static capacitors are rated in
Static capacitors are rated in:
- Kwh
- Kw
- Kvar
- None of these
Correct answer: 3. Kvar
Bonus:
