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  • Question
  • What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modulated to 50%?


  • Options
  • A. 2 kV, 0.5 kV
  • B. 1 kV, 0.5 kV
  • C. 0.75 kV, 0.25 kV
  • D. 0.5 kV, 1.5 kV

  • Correct Answer
  • 0.75 kV, 0.25 kV 

    Explanation
    What are the values of Emax and Emin displayed on the oscilloscope, when a 1 kV P-P carries is modul

    Emax - Emin = 0.5 x 1 kV = 0.5 kV

    2Emax = 1.5 kVi, Emax = 0.75 kV

    Emin = 0.25 kV.


    Exam Questions Papers problems


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    • Options
    • A.
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    • Discuss
    • 2. A TV picture is to be transmitted over a channel of 6 MHz bandwidth at a 35 dB S/N ratio. The capacity of the channel is

    • Options
    • A. 50 Mbps
    • B. 100 Mbps
    • C. 36 Mbps
    • D. 72 Mbps
    • Discuss
    • 3. The amplitude of a pair of composite sinusoidal signal y(n) = x1(n) + x2(n) with x1(n) = sin (5pn) x2(n) = 3 sin (5pn) is __________ .

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 1
    • Discuss
    • 4. The ratio of the diffusion coefficient in a semiconductor has the units

    • Options
    • A. V-1
    • B. em.V-1
    • C. V.cm-1
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    • 5. In the circuit below, delay of the EXOR and AND


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    • Options
    • A.
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    • 6. A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW then pinch-off voltage is __________ .

    • Options
    • A. - 2 V
    • B. 2 V
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    • D. 4 V
    • Discuss
    • 7. Suppose that the modulating signal is m(t) = 2cos (2pfmt) and the carrier signal is xC(t) = AC cos(2pfct), which one of the following is a conventional AM signal without over modulation?

    • Options
    • A. x(t) = Acm(t)cos(2pfct)
    • B. x(t) = Ac [1 + m(t)]cos (2pfct)
    • C.
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    • Discuss
    • 8. A MOSFET has a threshold voltage of 1 V and oxide thickness of 500 x 10-8 [?r = 3.9; ?0 = 8.85 x 10-14 F/cm, q = 1.6 x 10-19 c]. The region under the gate is ion implanted for threshold voltage tailoring. The base and type of impant required to shift threshold voltage to - 1 V are __________ .

    • Options
    • A. 8.6 x 1011/cm2, p-type
    • B. 8.6 x 1011/cm2, n-type
    • C. 0.86 x 109/cm2, p-type
    • D. 1.02 x 1012/cm2, n-type
    • Discuss
    • 9. If x1[n] x1(z) with ROC = R1 and x2[n] x2(z) with ROC = R2 then ROC for x1[n] + x2[n] will be __________ (where Ri ? Region of convergence and x1[n] and x2[n] are causal).

    • Options
    • A. R1 ? R2
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    • Options
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