1) If an ohmmeter reading immediately goes practically to zero and stays there, capacitor is___________? a. charged b. short-circuited c. lossy d. satisfactory
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2) The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________? a. CIR b. 1/RC c. RC d. RIC
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3) Mica capacitors are characterized by all of the following except___________? a. stable operation b. accurate value c. low leakage reactance d. low losses
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4) An uncharged conductor is placed near a charged conductor, then_____________? a. the uncharged conductor gets charged by conduction b. the uncharged conductor gets charged by induction and then attracted towards the charging body c. the uncharged conductor is attracted first and then charged by induction d. it remains as such
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5) Paper condenser is___________? a. always polarised b. usually of fixed value c. electrolytic condenser d. a variable condenser
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6) Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ? a. Aluminium foil capacitor b. Mica capacitor c. Ceramic capacitor d. Paper capacitor
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7) The presence of an uncharged conductor near a charged one increases the__________? a. charge of the charged conductor b. capacity of the charged conductor c. potential of the charged conductor d. all of the above
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8) Which of the following statements is correct ? a. Mica capacitors are available in capacitance values of 5 to 20 uF b. Air capapitors have a black band to indicate the outside foil c. Electrolytic capacitors must be connected in correct polarity d. Ceramic capacitors must be connected in correct polarity
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9) For a good 0.05 uF capacitor ohmmeter reading should___________? a. show low resistance momentarily and back off to a very high resistance b. show high resistance momentarily and then a very low resistance c. go quickly to 50 ohm approximately and remain there d. not move at all
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10) The ohmmeter reading for a short circuited capacitor is____________? a. infinity b. few kilo ohms c. few megohms d. zero
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11) An electrolytic capacitor is generally made to provide__________? a. low capacitance b. fixed capacitance c. variable capacitance d. large value of capacitance
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12) A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________? a. 5 times smaller than before b. 5 times greater than before c. 10 times greater than before d. 25 times larger than before
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13) A condenser suitable for D.C. only is________? a. metallic plate variable gang condenser b. metallic paper capacitor c. oil impregrated paper condenser d. poled aluminium electrolytic condenser
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14) Which of the following capacitor is preferred in case of single phase motor ? a. Mica capacitor b. Paper capacitor c. Electrolytic capacitor d. Ceramic capacitor
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15) When a dielectric is placed in an electric field the field strength____________? a. decreases b. increases c. reduces to zero d. remain unchanged
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16) Acharge which when placed in vacuum from an equal and similar charge repels with a force of 9 x 10 N, is known as_____________? a. milli-coulomb b. micro-coulomb c. pico-coulomb d. coulomb
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17) If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________? a. move out of the field of influence of the two charges b. remain in stable equilibrium c. not be in equilibrium d. be in unstable equilibrium
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18) Which of the following capacitors preferred for high frequency circuits ? a. Air capacitor b. Electrolytic capacitor c. Mica capacitor d. none of the above
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19) In order to remove static electricity from machinery___________? a. construct insulated cabins b. insulate the machinery c. ground the framework d. humidify the surroundings
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20) A region around a stationary electric charge has__________? a. an electric field b. a magnetic field c. both A. and (b) d. none of the above
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