logo

CuriousTab

CuriousTab

Discussion


Home Electronics and Communication Engineering Exam Questions Papers Comments

  • Question
  • 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

  • Correct Answer
  • decreases because the number of carries increases with increased collisions 

    Explanation
    Mobility of electrons As the temperature increases the mobility of electrons __________ . decreases because the number of

    m = 2.5 for electrons and 2.7 for holes in Si.


    Exam Questions Papers problems


    Search Results


    • 1. 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
    • 2. For a = - 1, find the value of V2

    • Options
    • A. ?
    • B. 0
    • C. V1
    • D. none of the above
    • Discuss
    • 3. 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
    • 4. Consider the system with and where p and q are arbitrary real numbers. Which of the following statements about the controllability of the system is true?

    • Options
    • A. The system is completely state controllable for any non zero values p and q
    • B. Only p = 0 and q = 0 result in controllability
    • C. The system is uncontrollable for all values of p and q
    • D. We cannot conclude about controllability from the given data
    • Discuss
    • 5. In a flash type ADC, employing 15 comparators resolution with 10 volts reference; is expected to be :

    • Options
    • A. 0.625 V
    • B. 0.656 V
    • C. 0.525 V
    • D. insufficient data
    • Discuss
    • 6. 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
    • 7. 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
    • 8. 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
    • 9. 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
    • 10. If the system T.F. is The differential equation representing the system is

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


    Comments

    There are no comments.

Enter a new Comment