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  • Question

  • 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
  • C. - 4 V
  • D. 4 V

  • Correct Answer
  • - 4 V 

    Explanation
    A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW

    A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW

    ? A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW

    ? A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW = - 8VP - 16

    ? A n-channel JFET has IDSS = 2 mA, Gate to source voltage VGS = - 2 V and trans-conductance is 0.5 mW + 8VP + 16 = 0

    ? (VP + 4)2 = 0

    ? VP = -4 V.

    Exam Questions Papers problems

    Search Results

    • 1. 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
      • Discuss
    • 2. If the system T.F. is The differential equation representing the system is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
      • Discuss
    • 3. 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
    • 4. 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
    • 5. The ratio of the diffusion coefficient in a semiconductor has the units

    • Options
    • A. V-1
    • B. em.V-1
    • C. V.cm-1
    • D. V.s
      • Discuss
    • 6. 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.
    • D. x(t) = Accos(2pfmt)cos(2pfct) + Acsin(2pfmt)sin(2pfct)
      • Discuss
    • 7. 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
    • 8. 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
    • B. R1 ? R2
    • C. (R1 ? R2) ? (R1)
    • D. (R1 ? R2) ? (R1)
      • Discuss
    • 9. If the power spectral density of stationary random process is a sine-squared function of frequency, the shape of its autocorrelation is

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss
    • 10. A transmission line has a characteristic impedance of 50 ? and a resistance of 0.1 ?/m, if the line is distortion less, the attenuation constant (in Np/m) is

    • Options
    • A. 500
    • B. 5
    • C. 0.014
    • D. 0.002
      • Discuss

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