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Home ‣ Electronics and Communication Engineering ‣ Materials and Components See What Others Are Saying!
  • Question

  • With increase in temperature, the electrical conductivity would


  • Options
  • A. increase in metals as well as in intrinsic semiconductor
  • B. increase in metals but decrease in intrinsic semiconductor
  • C. decrease in metals but increase in intrinsic semiconductor
  • D. decrease in metals as well as in intrinsic semiconductor

  • Correct Answer
  • decrease in metals but increase in intrinsic semiconductor 

    Explanation
    Increase in temperature causes resistivity of metals to increase and resistivity of intrinsic semiconductors to decrease.

    Conductivity is reciprocal of resistivity.

    More questions

    • 1. Which of the following circuit cannot be used to demodulate SSB?

    • Options
    • A. Phase discriminator
    • B. Produce detector
    • C. Balanced modulator
    • D. Beat frequency oscillator
      • Discuss
    • 2. Negative feedback reduces noise originating at the amplifier input.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Assertion (A): The surge current which an SCR can withstand is much higher than rms on state current.

      Reason (R): The duration of surge current is very small.


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

      List I List II
      A. Zener diode 1. used in seven segment display
      B. Tunnel diode 2. used in voltage regulator circuits
      C. LED 3. used is solar energy utilization
      D. Photovoltaic cell 4. used in digital circuits


    • Options
    • A. A-1, B-3, C-2, D-4
    • B. A-2, B-3, C-1, D-4
    • C. A-2, B-4, C-1, D-3
    • D. A-3, B-2, C-4, D-1
      • Discuss
    • 5. For the system in the given figure the characteristic equation is

    • Options
    • A.
    • B.
    • C. K(s + 1)(s + 3) = 0
    • D. s(s + 2) = 0
      • Discuss
    • 6. The magnitudes of OC and SC input impedances of a transmission line an 100 ? and 25 ?. The characteristic impedance is

    • Options
    • A. 25 ?
    • B. 50 ?
    • C. 75 ?
    • D. 100 ?
      • Discuss
    • 7. In the given figure x6 =

    • Options
    • A. de(ax1 + bx2 + cx3)
    • B. (a + b + c) (x1 + x2 + x3) (d + e)
    • C. (ax1 + bx2 + cx3) (d + e)
    • D. a b c d e (x1 + x2 + x3)
      • Discuss
    • 8. Which of the following cannot be used to demodulate SSB?

    • Options
    • A. Complete phase-shift generator
    • B. Product detector
    • C. Diode balanced modulator
    • D. Bipolar transistor balanced modulator
      • Discuss
    • 9. The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is

    • Options
    • A. R
    • B. L
    • C. C
    • D. Semiconductor
      • Discuss
    • 10. When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively

    • Options
    • A. Increased, Increased, Increased
    • B. Increased, Increased, Decreased
    • C. Increased, Decreased, Decreased
    • D. Decreased, Decreased, Decreased
      • Discuss

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