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Electrostatics free Model online Test2
Electrostatics free Model online Test2
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1. A paper capacitor is usually available in the form of _____.
tubes
rolled foil
disc
meshed plates
2. Air capacitors are generally available in the range ______.
10 to 400 pF
1 to 20 pF
100 to 900 pF
20 to 100 pF
3. The unit of capacitance is _____.
henry
ohm
farad
farad/m
4. A capacitor charged to 200 V has 2000 (iC of charge. The value of capacitance will be ______.
10 F
10 uF
100 uF
1000 uF
5. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
Paper capacitor
Ceramic capacitor
Electrolytic capacitor
Any of the above
6. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules _____.
CV2
C2V
CV2
CV
7. The absolute permittivity of free space is given by ______.
8.854 x 1(T9 F/m)
8.854 x 1(T10 F/m)
8.854 x KT11 F/m
8.854 x 10"12 F/m
8. The relative permittivity of free space is given by ______.
1
10
100
1000
9. Electric field intensity is a quantity ______.
scalar
vector
both (a) and (b)
none of the above
10. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of ______.
2 joules
4 joules
6 joules
8 joules
11. The capacitor preferred for high frequency circuits is ______.
air capacitor
mica capacitor
electrolytic capacitor
none of the above
12. The capacity of capacitor bank used in power factor correction is expressed in terms of ____.
kW
kVA
kVAR
volts
13. While testing a capacitor with ohm-metre, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is _____.
short-circuited
open circuited
alright
leaky
14. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be _____.
800 uC
900 uC
1200 uC
1600 uC
15. Which capacitor will be physically smaller for the same ratings ?
Ceramic capacitor
Paper capacitor
Both will be of equal size
None of the above
16. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
50 pF
100 pF
150 pF
200 pF
17. A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?
Ceramic capacitor
Mica capacitor
Both will have identical value of capacitance
It depends on applied voltage
18. Which of the following material has least value of dielectric constant ?
Ceramics
Oil
Glass
Paper
19. Which of the following capacitors will have the least value of breakdown voltage ?
Mica
Paper
Ceramic
Electrolytic
20. The breakdown voltage for paper capacitors is usually _____.
20 to 60 volts
200 to 1600 volts
2000 to 3000 volts
more than 10000 volts
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