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  • Question
  • The gradient of any scalar field always yields __________ .


  • Options
  • A. a solenoidal field
  • B. a conservative field
  • C. an irrotational field
  • D. none of these

  • Correct Answer
  • a conservative field 

    Explanation
    Dot product is conservative. Gradient is nothing but dot product.

    Exam Questions Papers problems


    Search Results


    • 1. Find 'X' in the circuit below :

      f1(A, B, C, D) = ?(6, 7, 13, 14);
      f2(A, B, C, D) = ?(3, 6, 7);
      f3(A, B, C, D) = ?(5, 6, 7, 14, 15)

    • Options
    • A. p(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15)
    • B. 0
    • C. ?(14)
    • D. 1
    • Discuss
    • 2. Consider the probability density f(x) = ae-b|x| where x is a random variable whose allowable values range from x = - ? to x = + ?. P(1 ? x ? 2)

    • Options
    • A.
    • B.
    • C.
    • D. (e-b - e-2b)
    • Discuss
    • 3. A radar receiver has a noise figure of 10 dB at 300 K having a bandwidth of 2.5 MHz. The minimum power it can receive is

    • Options
    • A. 3.45 x 10-15 W
    • B. 1.38 x 10-15 W
    • C. 7.5 x 10-15 W
    • D. 93.15 x 10-15 W
    • Discuss
    • 4. For a given voltage, four heating coils will produce maximum heat when connected

    • Options
    • A. all in parallel
    • B. all in series
    • C. with two parallel pairs in series
    • D. one pair in parallel with the other two in series
    • Discuss
    • 5. The continuous time system with impulse response h(t) = is stable, for n is even, when

    • Options
    • A. a = 0
    • B. a > 0
    • C. a < 0
    • D. a ? 0
    • Discuss
    • 6. The antenna current of an AM transmitter is 8 A, when only the carrier is sent, but it increases to 8.93 A when the carrier is modulated by a single sine wave. Determine the antenna current when the percent of modulation changes to 0.8

    • Options
    • A. 9.19 A
    • B. 9.91 A
    • C. 10.56 A
    • D. 8.61 A
    • Discuss
    • 7. Consider the signal flow graph shown in figure below. The gain is :

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 8. In the following non planar graph number of independent loop equations are

    • Options
    • A. 8
    • B. 12
    • C. 7
    • D. 5
    • Discuss
    • 9. The amplifier circuit shown below uses a silicon transistor. The capacitors Cc and CE can be assumed to be short at signal frequency and the effect of output resistance r0 can be ignored. If CE is disconnected from the circuit, which one of the following statements is TRUE?

    • Options
    • A. The input resistance Ri increases and the magnitude of voltage gain Av decreases
    • B. The input resistance Ri decreases and the magnitude of voltage gain Av decreases
    • C. Both input resistance Ri and the magnitude of voltage gain Av decrease
    • D. Both input resistance Ri and the magnitude of voltage gain Av increase
    • Discuss
    • 10. Consider the amplitude modulated (AM) signal Ac cos ?ct + 2 cos ?mt cos ?ct For demodulating the signal using envelope detector, the minimum value of Ac should be

    • Options
    • A. 2
    • B. 1
    • C. 0.5
    • D. 0
    • Discuss


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