30. Which of the following capacitors will have the least variation ?
A. Paper capacitor
B. Ceramic capacitor
C. Silver plated mica capacitor
D. None of the above
C. Silver plated mica capacitor
31. Which of the following statements is incorrect ?
A. The leakage resistance of ceramic capacitors is generally high
B. The stored energy in a capacitor decreases with reduction in value of capacitance
C. The stored energy in a capacitor increases with applied voltage
D. A wire cable has distributed capacitance between the conductors
B. The stored energy in a capacitor decreases with reduction in value of capacitance
32. Which of the following capacitors has relatively shorter shelf life ?
A. Mica capacitor
B. Electrolytic capacitor
C. Ceramic capacitor
D. Paper capacitor
B. Electrolytic capacitor
33. The sparking between two electrical contacts can be reduced by inserting a
A. capacitor in parallel with contacts
B. capacitor in series with each contact
C. resistance in line
D. none of the above
A. capacitor in parallel with contacts
34. In the case of a lossy capacitor, its series equivalent resistance value will be
A. small
B. very small
C. large
D. zero
C. large
35. The power dissipated in a pure capacitor is
A. zero
B. proportional to applied voltage
C. proportional to value of capacitance
D. both (b) and (c) above
A. zero
36. 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
B. an increase in applied voltage makes a capacitor charge
37. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will
A. remain uncharged
B. decrease
C. increase
D. become zero
B. decrease
38. 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
A. increase in plate area and decrease in distance between the plates
39. A capacitor consists of
A. two insulators separated by a conductor
B. two conductors separated by an insulator
C. two insulators only
D. two conductors only
B. two conductors separated by an insulator
40. A paper capacitor is usually available in the form of
A. tubes
B. rolled foil
C. disc
D. meshed plates
B. rolled foil
41. Air capacitors are generally available in the range
A. 10 to 400 pF
B. 1 to 20 pF
C. 100 to 900 pF
D. 20 to 100 pF
A. 10 to 400 pF
42. The unit of capacitance is
A. henry
B. ohm
C. farad
D. farad/m
C. farad
43. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be
A. 10 F
B. 10 uF
C. 100 nF
D. 1000 uF
B. 10 uF
44. A capacitor in a circuit became hot and ultimately exploded due to wrong
connections, which type of capacitor it could be ?
A. Paper capacitor
B. Ceramic capacitor
C. Electrolytic capacitor
D. Any-of the above
C. Electrolytic capacitor
45. Energy stored in the electric field of a capacitor C when charged from a D.C
source of voltage V is equal to joules
A. CV2
B. C2V
C. CV2
D. CV
A. CV2
