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  • Question
  • A JK flip flop has tpd= 12 ns. The largest modulus of a ripple counter using these flip flops and operating at 10 MHz is


  • Options
  • A. 16
  • B. 64
  • C. 128
  • D. 256

  • Correct Answer
  • 256 

    Explanation
    Number of flip-flops = A JK flip flop has tpd= 12 ns. The largest modulus of a ripple counter using these flip flops and op = 8.333 say 8

    Modulus = 28 = 256.


    More questions

    • 1. Two coaxial metallic cylinders have radii R1 and R2. The space between them is filled with a dielectric having dielectric constant ?r. The capacitance per metre length is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 2. In envelope detection of an AM waveform

    • Options
    • A. One side band and full-ampiitude carrier are needed
    • B. Both side bands and full-amplitude carrier are needed
    • C. Only two side bands are needed
    • D. Upper side band and part of carrier are needed
    • Discuss
    • 3. Which of the following statement regarding link loss for a satellite is wrong?

    • Options
    • A. For fixed antenna, it is inversely proportional to f2
    • B. For fixed frequency, it is inversely proportional to the product of the antenna aperture areas
    • C. For a given satellite operating at a given frequency, it is inversely proportional to
    • D. Loss in down-link is negligible as compared to that in uplink
    • Discuss
    • 4. Assertion (A): The steady state response, of a stable, linear, time invariant system, to sinusoidal input depends on initial conditions.

      Reason (R): Frequency response, in steady state, is obtained by replacing s in the transfer function by j?


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are correct but R is not correct explanation of A
    • C. A is correct but R is wrong
    • D. R is correct but A is wrong
    • Discuss
    • 5. Assertion (A): Artificial transmission lines are frequently used in laboratories.

      Reason (R): An artificial transmission line can be used to represent an actual line and can also be used as a delay circuit, as attenuator, as filter network etc.


    • Options
    • A. Both A and R are correct and R is correct explanation of A
    • B. Both A and R are 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
    • 6. Match the following:

      List I List II
      A. TTL 1. Low propagation delay
      B. ECL 2. Low power consumption
      C. MOS 3. High packing density
      D. CMOS 4. Saturated bipolar logic


    • Options
    • A. A-4, B-1, C-3, D-2
    • B. A-4, B-3, C-1, D-2
    • C. A-4, B-3, C-2, D-1
    • D. A-3, B-1, C-4, D-2
    • Discuss
    • 7. Match the following:

      List I (Memories) List II (Characteristic)
      A. Static PLA 1. erasable, programmable
      B. CCD 2. ultra high speed
      C. ECL 3. stores large volume of data
      D. GAL 4. Does not need refreshing
      5. Non-volatile


    • Options
    • A. A-4, B-3, C-2, D-1
    • B. A-4, B-2, C-3, D-1
    • C. A-5, B-1, C-2, D-3
    • D. A-3, B-5, C-2, D-1
    • Discuss
    • 8. The effect of source inductance in a 3 phase fully controlled bridge converter is to

    • Options
    • A. decrease the output voltage
    • B. increase the output voltage
    • C. decrease the output voltage and increase the output current
    • D. increase the output voltage and decrease the output current
    • Discuss
    • 9. Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20°C and 32 nA at 50°C.

      Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10°C rise in temperature.


    • 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. Match the following:

      List I (Diode Rectifier) List II (Expression for output voltage)
      A. Bridge 1.
      B. Half wave 2.
      C. Full wave using centre tapped transformer 3.


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


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