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  • Question

  • The transistor of following figure in Si diode with a base current of 40 ?A and ICBO = 0, if VBB = 6V, RE = 2 k? and ? = 90, IBQ = 20 ?A then RB =
    The transistor of following figure in Si diode with a base current of 40 ?A and ICBO = 0, if VBB = 6


  • Options
  • A. 200 k?
  • B. 265 k?
  • C. 150 k?
  • D. 100 k?

  • Correct Answer
  • 265 k? 

    Explanation
    The transistor of following figure in Si diode with a base current of 40 ?A and ICBO = 0, if VBB = 6.

    More questions

    • 1. If then for this to be true x(t) is

    • Options
    • A. exp (j2p f/t)
    • B. exp (-j2p f/t)
    • C. exp (j2p ft)
    • D. exp (-j2p f/t)
      • Discuss
    • 2. A bridge type single phase cycloconverter changes the frequency f to f/3. Then one half wave of output contains

    • Options
    • A. 3 full waves of input
    • B. 3 half waves of input
    • C. 6 full waves of input
    • D. 6 half waves of input
      • Discuss
    • 3. Match the following:

      List I (BHE, A0) List II (Word is read/write)
      A. 0, 0 1. 1 byte from/to odd address
      B. 0, 1 2. 1 byte from/to even address
      C. 1, 0 3. 16 bit word
      D. 1, 1 4. None


    • Options
    • A. A-1, B-2, C-3, D-4
    • B. A-3, B-1, C-2, D-4
    • C. A-2, B-3, C-4, D-1
    • D. A-4, B-1, C-2, D-3
      • Discuss
    • 4. If

    • Options
    • A. - 12
    • B. 12
    • C. 20
    • D. - 20
      • Discuss
    • 5. The circuit in figure is for

    • Options
    • A. resonant commutation
    • B. self commutation
    • C. load commutation
    • D. auxiliary commutation
      • Discuss
    • 6. The condition for underdamped oscillations in a series RLC circuit is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. In a single phase converter using a centre tapped transformer and with a highly inductive load, the firing angles is a. Each thyristor conducts for a period

    • Options
    • A. p
    • B. a
    • C. p - a
    • D.
      • Discuss
    • 8. The minority carrier life time and diffusion constant in a semiconductor material are respectively 100 microsecond and 100 cm2/sec. The diffusion length is

    • Options
    • A. 0.1 cm
    • B. 0.01 cm
    • C. 0.0141 cm
    • D. 1 cm
      • Discuss
    • 9. Which of the following is true as regards photo emission?

    • Options
    • A. Velocity of emitted electrons is dependent on light intensity
    • B. Rate of photo emission is inversely proportional to light intensity
    • C. Maximum velocity of electron increases with decreasing wave length
    • D. Both holes and electrons are produced
      • Discuss
    • 10. In a modified series inverter

    • Options
    • A. the maximum output frequency is less than frequency of damped oscillations
    • B. the output frequency can be even higher than the frequency of damped oscillations
    • C. the output frequency cannot exceed the frequency of damped oscillations
    • D. any of the above
      • Discuss

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