46. The absolute permittivity of free space is given by
A. 8.854 x 1(T9 F/m)
B. 8.854 x 1(T10 F/m)
C. 8.854 x KT11 F/m
D. 8.854 x 10″12 F/m
B. 8.854 x 1(T10 F/m)
47. The relative permittivity of free space is given by
A. 1
B. 10
C. 100
D. 1000
A. 1
48. Electric field intensity is a quantity
A. scalar
B. vector
C. both (a) and (6)
D. none of the above
B. vector
49. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
A. 2 joules
B. 4 joules
C. 6 joules
D. 8 joules
D. 8 joules
50. The capacitor preferred for high frequency circuits is
A. air capacitor
B. mica capacitor
C. electrolytic capacitor
D. none of the above
B. mica capacitor
51. The capacity of capacitor bank used in power factor correction is expressed in terms of
A. kW
B. kVA
C. kVAR
D. volts
C. kVAR
52. While testing a capacitor with ohm-metre, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is
A. short-circuited
B. open circuited
C. alright
D. leaky
D. leaky
53. If a 6 (if capacitor is charged to 200 V, the charge in coulombs will be
A. 800 uC
B. 900 uC
C. 1200 uC
D. 1600 uC
C. 1200 uC
54. Which capacitor will be physically smaller for the same ratings ?
A. Ceramic capacitor
B. Paper capacitor
C. Both will be of equal size
D. None of the above
A. Ceramic capacitor
55. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
A. 50 pF
B. 100 pF
C. 150 pF
D. 200 pF
B. 100 pF
56. A mica capacitor and a ceramic capacitor both have the same physical
dimensions. Which will have more value of capacitance ?
A. Ceramic capacitor
B. Mica capacitor
C. Both will have identical value of capacitance
D. It depends on applied voltage
A. Ceramic capacitor
57. Which of the following material has least value of dielectric constant ?
A. Ceramics
B. Oil
C. Glass
D. Paper
B. Oil
58. Which of the following capacitors will have the least value of breakdown
voltage ?
A. Mica
B. Paper
C. Ceramic
D. Electrolytic
D. Electrolytic
59. Dielectric constant for mica is nearly
A. 200
B. 100
C. 3 to 8
D. 1 to 2
C. 3 to 8
60. The value of dielectric constant for vacuum is taken as
A. zero
B. 1
C. 4
D. 10
B. 1
