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Electrostatic and Capacitance

Electrostatic and Capacitance
Which of the following capacitor is preferred in case of single phase motor ?

Electrolytic
Air
Mica
Paper

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Electrostatic and Capacitance
A 2 µF, a 4 µF, and a 10 µF capacitor are connected in series. The total capacitance is less than

10 µF
2 µF
1.5 µF
4 µF

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Electrostatic and Capacitance
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.

62, initial
37, initial
62, final
37, final

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Electrostatic and Capacitance
Which of the following capacitors has relatively shorter shelf life ?

Electrolytic
Paper
Mica
Ceramic

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Electrostatic and Capacitance
The relative permittivity has the following units

F/m
m/F
Wb/m
no units

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Electrostatic and Capacitance
The capacitor preferred for high frequency circuits is

Paper
Air
None of the listed here
Mica

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