Which of the following has negative temperature coefficient?

A. Carbon

B. Nickel

C. Brass

D. Constantan

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  1. Which statement is true about a passive circuit?
  2. What does a capacitor store?
  3. If two equal resistances connected in series across a certain supply are now connected in parallel across…
  4. What is the total effective capacitance of two 0.25 F capacitors connected in series?
  5. Which of the following represents the energy stored in a cap
  6. When two coils of identical reactance are in parallel without mutual inductancea the reactance of the…
  7. Nortons theorem is ____ Thevenins theorem.
  8. What capacitance exists not through design but simply because two conducting surfaces are relatively…
  9. A capacitor consists of two
  10. What is the peak factor of a triangular wave?
  11. What is the hot resistance of a 100 Wa 220 V incandescent lamp?
  12. A capacitance of 0.05 F equals
  13. An ac series circuit is composed of a resistance of 20 a inductive reactance of 40 a and a capacitive…
  14. The resistance of an insulator ___ when its temperature is increased.
  15. When voltage is applied across a ceramic dielectric the electrostatic field p roduced is 50 times greater…
  16. When the power factor of a circuit is zeroa
  17. Which of the following capacitors is suitable for dc filter circuits?
  18. What is the total capacitance of 10 capacitorsa each of 20 F in series?
  19. The ratio between the reactive power and the apparent power of an ac load is called
  20. For parallel capacitorsa total charge is
  21. What is the efficiency under the conditions of maximum power transfer?
  22. In an ac circuit with inductive reactance ?, the
  23. In dividing or multiplying phasor quantitiesa ___ form is used.
  24. Which one of the following elements serves as a protection against overload?
  25. An electric circuit contains
  26. Which of the following does not affect resistance?
  27. A lead conductor has a resistance of 25 at 0 C. Determine its resistance at -30 C
  28. The capacitance of a capacitor is ___ relative permittivity.
  29. The power factor of a certain circuit in which the voltage lags behind the current is 80 %. To increase…
  30. What is the purpose of a load in an electric circuit?