Capacitor MCQ | Capacitance MCQ

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

1. Mica capacitor
2. Air capacitor
3. Electrolytic capacitor
4. None of these

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

1. Paper capacitor
2. Mica capacitor
3. Ceramic capacitor
4. Electrolytic capacitor

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

1. decrease
2. remains the same
3. increase
4. becomes zero

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

1. 3/4 μF
2. 12 μF
3. 4.3 μF
4. 4 μF

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

1. 4C
2. C/4
3. 3/4C
4. C

66. Mica or ceramic condenser is a type of

1. fixed condenser
2. variable condenser
3. electrolytic condenser
4. None of these

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

1. Paper capacitor
2. Air capacitor
3. Electrolytic capacitor
4. Ceramic capacitor

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

1. Very high
2. Very low
3. Low
4. None of these

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

1. A 500pF capacitor charged to 10kV
2. A 1 μF capacitor, charged to 5kV
3. A 40 μF capacitor charged to 400V
4. 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

1. 2.2
2. 2
3. 0.22
4. 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

1. Paper capacitor
2. Electrolyte capacitor
3. Parallel plate with mica dielectric
4. None of these

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

1. a square wave
2. triangular wave
3. step function
4. zero

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

1. The total capacitance increases
2. The total capacitance deceases
3. The mean value gives the new capacitance
4. 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

1. 6 F
2. 5/11 F
3. 5/6 F
4. 11/5 F

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

1. 4C
2. C/4
3. C
4. 3/4C

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

1. same as that due to a d.c. source at equivalent magnitude
2. half of at due to a d.c. source at equivalent magnitude
3. zero
4. None of these

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

1. increases
2. decreases
3. remains constant
4. 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

1. 25 pF
2. 124 pF
3. 925 pF
4. 250 pF

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

1. Dielectric
2. Metal plates
3. Dielectric as well as metal plates
4. Neither dielectric nor metal plates

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

1. Accurate value
2. Low losses
3. Low leakage resistance
4. Stable operation

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

1. High permittivity
2. Low permittivity
3. Permittivity same as that of air
4. None of these

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

1. 10 μF
2. 60 μF
3. 90 μF
4. None of these

83. Internal heating of capacitor is usually attributed to

1. Dielectric charge
2. Plate vibration
3. Electron movement
4. Leakage resistance

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

1. Ceramic capacitor
2. Mica capacitor
3. Aluminum foil capacitor
4. Paper capacitor

85. Generally an electrolytic capacitor is made to provide

1. Fixed capacitance
2. Variable capacitance
3. Low capacitance
4. Large value of capacitance

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

1. Relay
2. Capacitor
3. Inductor
4. Transistor

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

1. inductance
2. conductance
3. reactance
4. capacitance

88. A capacitor dissipates __________energy.

1. no
2. 10% of the stored
3. 20% of the stored
4. 50% of the stored

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

1. 0.1 C
2. 2.1 C
3. 0.016 C
4. 0.16 C