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.Management Sciences
Category: Electrostatics
Paper condenser is___________?
A. always polarised
B. usually of fixed value
C. electrolytic condenser
D. a variable condenser
For making a capacitor, it is better to select a dielectric having___________?
A. low permittivity
B. high permittivity
C. permittivity same as that of air
D. permittivity slightly more than that of air
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
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______________?
A. 400 N/C
B. 600 N/C
C. 800 N/C
D. 1200 N/C
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
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
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
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
Which of the following capacitors will have the least variation ____________?
A. Paper capacitor
B. Ceramic capacitor
C. Silver plated mica capacitor
D. None of the above
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