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  • Question
  • 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

  • Correct Answer
  • V-1 

    Explanation
    The ratio of the diffusion coefficient in a semiconductor has the units V-1 em.V-1 V.cm-1 V.s ..

    Exam Questions Papers problems


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    • 1. In the circuit below, delay of the EXOR and AND


      Logic gates are 20 ?s and 10 ?s respectively, then the wave y' and y (with initial condition y = 1) will be :

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 2. As the temperature increases the mobility of electrons __________ .

    • Options
    • A. decreases because the number of carries increases with increased collisions
    • B. increases because the number of carries decreases with decreased collisions
    • C. remains same
    • D. none of the above
    • Discuss
    • 3. The specific gravity of tungsten is 13.8 and its atomic weight is 184.0 Assume that there are two free elements per atom. Then the Fermi level or characteristic energy for the crystal in eV will be

    • Options
    • A. 8.95 eV
    • B. -8.95 eV
    • C. 7.326 eV
    • D. -7.326 eV
    • Discuss
    • 4. For a = - 1, find the value of V2

    • Options
    • A. ?
    • B. 0
    • C. V1
    • D. none of the above
    • Discuss
    • 5. In a 4 bit weighted resistor D/A converter, the resistor value corresponding to LSB is 32 k?. The resistor value corresponding to MSB will be

    • Options
    • A. 32 K?
    • B. 16 K?
    • C. 8 K?
    • D. 4 K?
    • Discuss
    • 6. 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
    • 7. 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
    • 8. If the system T.F. is The differential equation representing the system is

    • Options
    • A.
    • B.
    • C.
    • D. none of these
    • Discuss
    • 9. 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
    • 10. 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
    • Discuss


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