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

You can do it
  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?