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1) Dielectric strength of a medium is usually expressed in____________? a. J/mm b. C/m2 c. kV/mm d. N/mm
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2) Which is the most superior dielectric out of the following ? a. Air b. Glass c. Bakelite d. Paper
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3) To prevent the generation of static charges on rubber or flat leather__________? a. surface is moistened b. conductive dressing is done c. oil compound dressing is done d. talcum powder is sprayed on the surface
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4) A capacitance is a circuit component that opposes the change in circuit__________? a. Current b. Voltage c. impedance d. None of the above
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5) In a capacitor, the electric charge is stored in_________? a. metal plates b. dielectric c. dielectric as well as metal plates d. none of the above
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6) The minimum value of potential gradient in a cable occurs in____________? a. insulation b. conductor c. outer sheath d. uniformly all over
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7) Dielectric strength of medium____________? a. increases with rise in temperature b. increases with moisture content c. is same for all insulating materials d. none of the above
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8) A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________? a. 100 kV/m b. 10 kV/m c. 5 kV/m d. 2 kV/m
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9) What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ? a. It will become magnetic b. It will melt c. It will get punctured or cracked d. Its molecular structure will get changed
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10) A capacitor consists of two____________? a. ceramic plates and one mica disc b. insulators separated by a dielectric c. silver-coated insulators d. conductors separated by an insulator
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11) 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 a. 37 b. 42 c. 63 d. 73
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12) at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ? a. Electric intensity b. Magnetic flux density c. Electric flux d. None of the above
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13) 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____________? a. 62 x 105 V/m b. 72 x 105 V/m c. 82 x 105 V/m d. 92 x 105 V/m
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14) capacitors are used for audio frequency and radio frequency coupling and tuning ? a. Air b. Mica c. Plastic film d. Ceramic
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15) The units of volume charge density are___________? a. Coulomb/meter b. Coulomb/meter c. Coulomb/meter d. Coulomb/meter
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16) Which of the following capacitors will have the least value of breakdown voltage________ ? a. Mica b. Paper c. Ceramic d. Electrolytic
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17) 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
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18) 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
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19) The capacity of capacitor bank used in power factor correction is expressed in terms of____________? a. kW b. kVA c. kVAR d. volts
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20) The relative permittivity of free space is given by__________? a. 1 b. 10 c. 100 d. 1000
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