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Tungsten filament of bulbs has a hot resistance higher than its cold resistance due to its temperature coefficient which is

A. Positive

B. Negative

C. Zero

D. Infinite

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  1. The electric field strength between capacitor plates has a unit
  2. Series resonance occurs when
  3. The curve between current and frequency is termed as
  4. What theorem is usually used in the analysis of transistor circuit?
  5. A resistor wound with a wire doubled back on itself to reduce the inductance.
  6. When two in-phase sine waves that have identical frequency and amplitude are added togethera then the…
  7. In liquids and gasesa ionization current results from a flow of
  8. Which of the following is not a factor affecting dielectric strength?
  9. The resistance of an insulator ___ when its temperature is increased.
  10. The superposition theorem is used when the circuit contains
  11. In calculating maximum instantaneous power ___ voltage or current is used.
  12. What is the value of a carbon composition resistor with the following color code: Browna whitea orangea…
  13. When two unequal values of resistors are connected in parallel across a dc sourcea greater current flows…
  14. Two complex numbers or phasors are said to be conjugate if they
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    A lead conductor has a resistance of 25 at 0 C. Determine its resistance at -30 C
  16. Which of the statements below is not true?
  17. The unit of elastance is
  18. The admittance of a parallel RLC circuit is found to be the ___ sum of conductance and susceptances.
  19. The ratio between the active power and the apparent power of a load in an ac circuit is called
  20. An open resistor when checked with an ohmmeter reads
  21. A series RLCcircuit has a ______ power factor at its half-power points
  22. Metal tin becomes superconductor at approximately
  23. A capacitor opposes change in
  24. If resonant frequency is 10 kHz and quality factor is 50a then
  25. In an ac wavea 30 degrees of phase is ___ of a cycle.
  26. Another term for superconductor.
  27. The charge in the capacitor is stored at the
  28. In a complex resistance-reactance planea XLis represented
  29. Which of the following does not affect resistance?
  30. What is the total resistance of a two equal valued resistors in series?