61. Which capacitor is preferred for high-frequency circuits?

- Mica capacitor
- Air capacitor
- Electrolytic capacitor
- None of these

62. In which types of capacitors care should be taken about the correct polarity while connecting it in a circuit?

- Paper capacitor
- Mica capacitor
- Ceramic capacitor
- Electrolytic capacitor

63. In a parallel plate capacitor, a dielectric slab is introduced, the potential difference between plates will?

- decrease
- remains the same
- increase
- becomes zero

64. Three capacitors of capacity 4 μF each are connected in parallel, the resultant capacitance will be

- 3/4 μF
- 12 μF
- 4.3 μF
- 4 μF

65. What will be the capacity of four capacitors of equal capacity “C” when connected in parallel?

- 4C
- C/4
- 3/4C
- C

66. Mica or ceramic condenser is a type of

- fixed condenser
- variable condenser
- electrolytic condenser
- None of these

67. In a radio, a gang condenser is a type of

- Paper capacitor
- Air capacitor
- Electrolytic capacitor
- Ceramic capacitor

68. A capacitor can be represented by a capacitance resistance in parallel. For a good capacitor, this parallel resistance is

- Very high
- Very low
- Low
- None of these

69. Which of the following capacitors will have least energy stored in it?

- A 500pF capacitor charged to 10kV
- A 1 μF capacitor, charged to 5kV
- A 40 μF capacitor charged to 400V
- All will have same energy stored

70. A capacitor of 40 μF is charged to a potential difference of 500 volts. The charge acquired by the capacitor, in Coulomb’s, is

- 2.2
- 2
- 0.22
- 0.02

71. The capacitor, commonly used for ceiling fan motor has a value of 2.3 μF. The type of capacitor used is generally

- Paper capacitor
- Electrolyte capacitor
- Parallel plate with mica dielectric
- None of these

72. If a capacitor is charged by a square wave current source, the voltage across the capacitor is

- a square wave
- triangular wave
- step function
- zero

73. How will the total capacitance change, when two capacitors are connected in parallel?

- The total capacitance increases
- The total capacitance deceases
- The mean value gives the new capacitance
- The total capacitance is found by reciprocal equation

74. Two condensers of capacity 2F and 3F are connected in series, a third condenser of 1F is connected in parallel to them, the resultant capacity in Farad (F) will be

- 6 F
- 5/11 F
- 5/6 F
- 11/5 F

75. What will be the capacity of four capacitors of equal capacity ‘C’, when connected in series?

- 4C
- C/4
- C
- 3/4C

76. Energy stored in a capacitor over a cycle when excited by an a.c. source is

- same as that due to a d.c. source at equivalent magnitude
- half of at due to a d.c. source at equivalent magnitude
- zero
- None of these

77. When the plate area of a parallel plate capacitor is increased keeping the capacitor voltage constant, the force between plates

- increases
- decreases
- remains constant
- may increase or decrease on the metal making up the plates

78. A six dot mica capacitor color coded, white, red, green brown, red and yellow has the capacitance value of

- 25 pF
- 124 pF
- 925 pF
- 250 pF

79. In a capacitor, the electric charge is stored in

- Dielectric
- Metal plates
- Dielectric as well as metal plates
- Neither dielectric nor metal plates

80. Mica capacitors are characterised by all of the following except

- Accurate value
- Low losses
- Low leakage resistance
- Stable operation

81. For making capacitors, it is better to select a dielectric having

- High permittivity
- Low permittivity
- Permittivity same as that of air
- None of these

82. If three 30 μF capacitors are connected in series, the net capacitance is

- 10 μF
- 60 μF
- 90 μF
- None of these

83. Internal heating of capacitor is usually attributed to

- Dielectric charge
- Plate vibration
- Electron movement
- Leakage resistance

84. Which of the following capacitors of identical rating will have the smallest dimensions?

- Ceramic capacitor
- Mica capacitor
- Aluminum foil capacitor
- Paper capacitor

85. Generally an electrolytic capacitor is made to provide

- Fixed capacitance
- Variable capacitance
- Low capacitance
- Large value of capacitance

86. _______ consists of two plates separated by a dielectric and can store charge

- Relay
- Capacitor
- Inductor
- Transistor

87. What is the term used to describe the ability of a device to store energy in the form of an electrical charge?

- inductance
- conductance
- reactance
- capacitance

88. A capacitor dissipates __________energy.

- no
- 10% of the stored
- 20% of the stored
- 50% of the stored

89. Potential difference across a 0.04 F capacitance is 4V. The charge stored in it will be

- 0.1 C
- 2.1 C
- 0.016 C
- 0.16 C