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  • Question

  • In high frequency circuits impedance matching can be done by

    1. open circuited stubs
    2. short circuited stubs
    3. In high frequency circuits impedance matching can be done by open circuited stubs short circuited sttransformer
    Which of the above correct?


  • Options
  • A. 1, 2 and 3
  • B. 1 and 2 only
  • C. 1 and 3 only
  • D. 2 and 3 only

  • Correct Answer
  • 1, 2 and 3 

    Explanation
    All the three can be used for impedance matching in high frequency circuits.

    More questions

    • 1. A transmitter serial current contains

    • Options
    • A. carrier frequencies
    • B. audio frequencies
    • C. radio frequencies
    • D. none of the above
      • Discuss
    • 2. Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V.

      Reason (R): When an SCR is conducting, the junction temperature is about 200°C.


    • 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
      • Discuss
    • 3. In rectangular waveguides the ratio of width to height is about

    • Options
    • A. 0.5
    • B. 1
    • C. 2
    • D. 4
      • Discuss
    • 4. Denominator polynomial of a transfer function of certain network is:
      s3 + s2 + 2s + 24
      Then the network is:

    • Options
    • A. stable
    • B. oscillatory
    • C. unstable
    • D. depends on numerator polynomial
      • Discuss
    • 5. Match the following:

      List I (Camera pick up tubes) List II (Developed by)
      A. CCD charger 1. Toshiba
      B. New vicon 2. Philips
      C. Plumbicon 3. Matushita
      D. Chalnicon 4. RCA


    • Options
    • A. A-3, B-4, C-1, D-2
    • B. A-4, B-3, C-2, D-1
    • C. A-4, B-3, C-1, D-2
    • D. A-1, B-2, C-3, D-4
      • Discuss
    • 6. For l << ?, the equivalent circuit of a microwave resistor is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 7. PIN diode has

    • Options
    • A. p+ and n layers separated by i layer
    • B. p+ and n+ layers separated by i layer
    • C. p- and n- layers separated by i layer
    • D. none of the above
      • Discuss
    • 8. Which one of the following is not a negative resistance device?

    • Options
    • A. Gunn diode
    • B. Tunnel diode
    • C. Impatt diode
    • D. Varactor diode
      • Discuss
    • 9. Assertion (A): The conductivity of p type semiconductor is higher than that of intrinsic semiconductor.

      Reason (R): The addition of donor impurity creates additional energy levels below conduction band.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not a correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 10. The radiation resistance of a circular loop of one turn is 0.01 ohm. For 5 turn loop the radiation resistance is

    • Options
    • A. 0.002 ?
    • B. 0.01 ?
    • C. 0.05 ?
    • D. 0.25 ?
      • Discuss

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