ELECTROSTATIC- Electrical Engineering (MCQ) questions and answers
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1.The force between two charges is 120 N. If the distance between the charges is doubled, the force will be
2. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be
3. The lines of force due to charged particles are
4. The electric field at a point situated at a distance d from straight charged conductor is
5. A field line and an equipotential surface are
6. The ability of charged bodies to exert force on 6ne another is attributed to the existence of
7. The direction of electric field due +0 positive charge is .
8. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
9. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is
10.For making a capacitor, it is better to select a dielectric having
11. The units of capacitance are
12. If three 15 uF capacitors are connected in series, the net capacitance is
13. If three 10 uF capacitors are connected in parallel, the net cararitance is
14. A dielectric material must be
15.An electrolytic capacitor can be used for
16. Which of the following is not a vector ?
17. The capacitance of a capacitor is not affected by
18. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the
19. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because
20.Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ?
21.Which of the following statements is correct ?
22. The dissipation factor of a good dielectric is of the order of
23. “The total electric flux through any closed surface surrounding charges is equal to the amount of charge enclosed”.
The above statement is associated with
24. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them
25.For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?
26.Which of the following statement is true ?
27. Which of the following expression is correct for electric field strength ?Which of the following expression is correct for electric field strength?
28. In a capacitor the electric charge is stored in
29. Which of the following materials has the highest value of dielectric constant?
30.Which of the following capacitors will have the least variation ?
31. Which of the following statements is incorrect ?
32. Which of the following capacitors has relatively shorter shelf life ?
33. The sparking between two electrical contacts can be reduced by inserting a
34. In the case of a lossy capacitor, its series equivalent resistance value will be
35.The power dissipated in a pure capacitor is
36. In a capacitive circuit
37. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will
38. Capacitance increases with
39. A capacitor consists of
40. A gang condenser is a
41. A paper capacitor is usually available in the form of
42. Air capacitors are generally available in the range
43. The unit of capacitance is
44. A capacitor charged to 200 V has 2000 uC of charge. The value of capacitance will be
45. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
46. The relative permittivity of free space is given by
47. Electric field intensity is a quantity
48. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
49. The capacitor preferred for high frequency circuits is
50.The capacity of capacitor bank used in power factor correction is expressed in terms of
51.While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is
52. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be
53. Which capacitor will be physically smaller for the same ratings ?
54. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
55.A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?
56.Which of the following material has least value of dielectric constant ?
57. Which of the following capacitors will have the least value of breakdown voltage ?
58. The breakdown voltage for paper capacitors is usually
59. Dielectric constant for mica is nearly
60.Which of the following capacitors is marked for polarity ?
61.Which of the following capacitors can be used for temperature compensation ?
62. Which of the following statements is incorrect ?
63. Paper capacitors usually have a tolerance of
64. For closer tolerances which of the following capacitors is usually preferred ?
65.Dielectric strength of mica is
66. The dielectric constant (relative permittivity) of glass is given by
67. capacitors are mainly used for radio frequency tuning.
68. capacitors can be used only for D.C.
69. capacitors are used in transistor circuits.
70.capacitors are used for audio frequency and radio frequency coupling and tuning.
71.The inverse of capacitance is called
72. When the dielectric is homogeneous,the potential gradient is
73. The potential gradient across the material of low permittivity is than across the material of high permittivity.
74.________field is associated with the capacitor.
75.A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is
76.A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is
77. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is
78. The total deficiency or excess of electrons in a body is known as
79. The relative permittivity has the following units
80.The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as
81.A unit tube of flux is known as tube
82. The number of Faraday tubes of flux passing through a surface in an electric field is called
83. The value of E within the field due to a point charge can be found with the help of
84. At a point may be defined as equal to the lines of force passing normally through a unit cross section at that point.
85.Electric intensity at any point in an electric field is equal to the at that point.
86. Electric displacement is a______quantity.
87. At a point is equal to the negative potential gradient at that point.
88. The unit of dielectric strength is given by
89. Dielectric strength ______ with increasing thickness
90.The property of a capacitor to store electricity is called its
91.Is that property of a capacitor which delays any change of voltage across it.
92. In a cable capacitor, voltage gradient is maximum at the surface of the
93. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to ______ percent of its value.
94. The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value.
95.A capacitor consists of two
96. Permittivity is expressed in
97. Dielectric strength of a material depends on
98.What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ?
99. Which medium has the least dielectric strength ?
100.1 volt/meter is same as
101.One volt is the same as
102.The capacitance between two plates increases with
103. The bridge used for the measurement of the value of the capacitance is
104.If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is
105.Out of the following capacitors of identical rating which one will have the smallest dimensions ?
106. An uncharged conductor is placed near a charged conductor, then
107. The presence of an uncharged conductor near a charged one increases the
108. Paper condenser is
109. Mica capacitors are characterised by all of the following except
110.A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is
111.For a good 0.05 uF capacitor ohmmeter reading should
112. The ohmmeter reading for a short circuited capacitor is
113. Which of the following statements is correct ?
114. Which of the following capacitors preferred for high frequency circuits ?
115.An electrolytic capacitor is generally made to provide
116. In order to remove static electricity from machinery
117. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will
118.A region around a stationary electric charge has
119. The minimum value of potential gradient in a cable occurs in
120.To prevent the generation of static charges on rubber or flat leather
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