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  • Question

  • In the given figure, if R = XC, voltage gain is
    In the given figure, if R = XC, voltage gain is 0 dB 3 dB -3 dB 20 dB If R = XC, V0 = 0.5 Vi Hence g


  • Options
  • A. 0 dB
  • B. 3 dB
  • C. -3 dB
  • D. 20 dB

  • Correct Answer
  • -3 dB 

    Explanation
    If R = XC, V0 = 0.5 Vi Hence gain is -3 dB.

    More questions

    • 1. The problem associated with tuned-radio frequency receiver is

    • Options
    • A. instability
    • B. insufficient adjacent frequency rejection
    • C. bandwidth variation
    • D. all of the above
      • Discuss
    • 2. Which one of the following is not a useful quantity for comparing the noise performance of receivers?

    • Options
    • A. Noise figure
    • B. Noise temperature
    • C. Input noise voltage
    • D. Equivalent noise resistance
      • Discuss
    • 3. To study electromagnetic radiations from astronomical objects, radio astronomers use

    • Options
    • A. low frequencies
    • B. medium frequencies
    • C. microwaves
    • D. either (a) or (b)
      • Discuss
    • 4. Figure shows an RC potentiometer to measure ac voltage. It is desired that V0/Vi should be independent of frequency. The value of C should be

    • Options
    • A. 10 ?F
    • B. 11 ?F
    • C. 0.1 ?F
    • D. 0.09 ?F
      • Discuss
    • 5. Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.

      Reason (R): Crystalline state is a natural state for most solids.


    • 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 correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss
    • 6. Match the following:

      List I (Controller) List II (Controller output for unit step input)
      A. Proportional derivative 1.
      B. Proportional plus derivative plus integral 2.
      C. Proportional plus 3.


    • Options
    • A. A-1, B-2, C-3
    • B. A-1, B-3, C-2
    • C. A-3, B-2, C-1
    • D. A-2, B-3, C-1
      • Discuss
    • 7. As frequency is increased, the skin effect

    • Options
    • A. increases
    • B. decreases
    • C. remains the same
    • D. either (b) or (c)
      • Discuss
    • 8. In a controlled rectifier a freewheeling diode is necessary if the load is

    • Options
    • A. inductive
    • B. resistive
    • C. capacitive
    • D. any of the above
      • Discuss
    • 9. A parallel plate capacitor having C = 200 x 10-12 F has loss dielectric having tan ? = 4 x 10-4. At an ac voltage of f = 106 Hz and peak value 2 V, the dielectric losses are

    • Options
    • A. 10-8 W
    • B. 10-6 W
    • C. 10-4 W
    • D. 10-2 W
      • Discuss
    • 10. A full adder can be made out of

    • Options
    • A. two half adders
    • B. two half adders and a OR gate
    • C. two half adders and a NOT gate
    • D. three half adders
      • Discuss

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