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Home Electronics and Communication Engineering Power Electronics See What Others Are Saying!
  • Question
  • Assertion (A): A transistor requires a continuous base signal for conduction but a thyristor requires a gate pulse.

    Reason (R): Transistor find widespread application in power electronic circuits.


  • Options
  • A. Both A and R are correct and R is correct explanation of A
  • B. Both A and R correct but R is not correct explanation of A
  • C. A is correct but R is wrong
  • D. A is wrong but R is correct

  • Correct Answer
  • A is correct but R is wrong 

    Explanation
    Transistors are used but not very widely.

    More questions

    • 1. Consider the following statements (L is the length of array between centres of end antennas and A is wave-length)

      1. Width of major lobe between nulls of broad side array and end fire array are different.
      2. Directive gain of broadside array and end fire array are different.
      3. Directive gain of broadside array is 4
      Which of the above statements are correct?

    • Options
    • A. 1, 2 and 3
    • B. 1 and 2 only
    • C. 1 only
    • D. 1 and 3 only
    • Discuss
    • 2. The two terms used to describe performance of a directional coupler are

    • Options
    • A. coupling and directivity
    • B. gain and coupling
    • C. gain and directivity
    • D. gain and isolation
    • Discuss
    • 3. In the circuit of figure, the switch is closed at t = 0. At t = 0+ the current through C is

    • Options
    • A. 4 A
    • B. 2.5 A
    • C. 3.1 A
    • D. 0
    • Discuss
    • 4. A wave is propagated in a waveguide at frequency of 9 GHz and separation is 2 cm between walls calculate the phase velocity for dominant mode.

    • Options
    • A. 3 x 108 m/sec
    • B. 5 x 108 m/sec
    • C. 1.5 x 108 m/sec
    • D. 9 x 108 m/sec
    • Discuss
    • 5. When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.

    • Options
    • A. True
    • B. False
    • Discuss
    • 6. If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.

    • Options
    • A. True
    • B. False
    • Discuss
    • 7. Nickel is a non-magnetic material.

    • Options
    • A. True
    • B. False
    • Discuss
    • 8. In a single phase full wave regulator feeding a resistive load, the average current over one full cycle

    • Options
    • A. is always zero
    • B. cannot be zero
    • C. may be sometimes zero
    • D. is always positive
    • Discuss
    • 9. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.

    • Options
    • A. True
    • B. False
    • Discuss
    • 10. In a series inverter supplying a load resistance R, the commutating elements L and C should be such that

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss


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