A trimmer is a variable capacitor in which capacitance is varied by changing the

A. Number of plates

B. Dielectric

C. Distance between plates

D. Plate area

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  1. Which of the following does not generally affect the value of a capacitor?
  2. The value of temperature coefficient ( ) is dependent upon
  3. Transient period is considered over after
  4. It is impossible to change the voltage across a capacitor instantlya as this would produce ___ current.
  5. When the net reactance in a series coil-capacitor circuit is zero at frequency fa the nature of its…
  6. What is the temperature coefficient of the resistance Eureka?
  7. In an ac wavea 30 degrees of phase is ___ of a cycle.
  8. The area of capacitor plates increases two timesa then its capacitance
  9. If the output resistance of a voltage source is 4 a it internal resistance should be
  10. Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature…
  11. In a pure capacitancea
  12. The reason why alternating current can induce voltage is
  13. Electric energy refers to
  14. In a circuita a passive element is one which
  15. Which component opposes voltage change?
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    An impedance given by 90 -45 is a/an ___ impedance.
  17. For a triangular and sawtooth waveform the rms voltage or current equals
  18. Which of the following is neither a basic physical law nor deliverable from one?
  19. A real current source has
  20. Conventional flow assumes charges flow from
  21. Why are inductance and capacitance not relevant in a dc circuit?
  22. The ratio of the flux density to the electric field intensity in the dielectric is called
  23. Resistor with colored bands in the body
  24. If resonant frequency is 10 kHz and quality factor is 50a then
  25. Which of the following is the peakiest?
  26. What value of R is needed with a 0.05 F Cfor an RCtime constant of 0.02 s?
  27. Which of the following materials has the lowest dielectric strength?
  28. A circuit whose parameters change with voltage or current.
  29. Which of the following capacitors is suitable for dc filter circuits?
  30. The charging of a capacitor through a resistance follows what law?