Electrostatics(Electrical Engineering ) Questions and answers for exam Preparation

Question 1. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be

10 F
10 uF
100 nF
1000 uF

Explanation:-

Answer: Option B. -> 10 uF

Question 2. Which of the following capacitors will have the least value of breakdown voltage ?

Mica
Paper
Ceramic
Electrolytic

Explanation:-

Answer: Option D. -> Electrolytic

Question 3. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will

remain uncharged
decrease
increase
become zero

Explanation:-

Answer: Option B. -> decrease

Question 4. The power dissipated in a pure capacitor is

zero
proportional to applied voltage
proportional to value of capacitance
both (B) and (C) above

Explanation:-

Answer: Option A. -> zero

Question 5. For making a capacitor, it is better to select a dielectric having

low permittivity
high permittivity
permittivity same as that of air
permittivity slightly more than that of air

Explanation:-

Answer: Option B. -> high permittivity

Question 6. The minimum value of potential gradient in a cable occurs in

insulation
conductor
outer sheath
uniformly all over

Explanation:-

Answer: Option A. -> insulation

Question 7. Dielectric strength ______ with increasing thickness

increases
decreases
remains unaltered
none of the above

Explanation:-

Answer: Option B. -> decreases

Question 8. Capacitors are mainly used for radio frequency tuning.

Paper
Air
Mica
Electrolytic

Explanation:-

Answer: Option B. -> Air

Question 9. Which medium has the least dielectric strength ?

Paraffin wax
Quartz
Glass
Air

Explanation:-

Answer: Option D. -> Air

Question 10. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will

move out of the field of influence of the two charges
remain in stable equilibrium
not be in equilibrium
be in unstable equilibrium

Explanation:-

Answer: Option B. -> remain in stable equilibrium