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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.

    More questions

    • 1. In a full bridge single phase inverter feeding RLC load

    • Options
    • A. one thyristor and one diode conduct simultaneously
    • B. two thyristors conduct simultaneously
    • C. two thyristors or two diodes conduct simultaneously
    • D. four thyristors conduct simultaneously
      • Discuss
    • 2. In figure, Z1 = 200?60° ?, Z2 = 400? - 90° ?, Z3 = 300?0°. Then Z4 for bridge to be balanced is

    • Options
    • A. 150?30° ?
    • B. 400? - 90° ?
    • C. 300?90° ?
    • D. 600? - 150° ?
      • Discuss
    • 3. Which curve represents the fidelity curve of a standard receiver?

    • Options
    • A. Curve A
    • B. Curve B
    • C. Curve C
    • D. Curve D
      • Discuss
    • 4. 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
    • 5. When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B).

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ?t and firing angle is a. If average current is I0, then

    • Options
    • A. cos a = RI0 + E
    • B. cos a = RE0 + E
    • C. cos a = E0 - RI0
    • D. cos a = E - RI0
      • Discuss
    • 7. A geosynchronous satellite

    • Options
    • A. has the same period a that of the Earth
    • B. has a circular orbit
    • C. rotates in the equatorial plane
    • D. has all of the above
      • Discuss
    • 8. Ferromagnetic materials

    • Options
    • A. shows spontaneous magnetisation below a certain temperature
    • B. have resistivity very high as compared to that of iron
    • C. can be used even at microwave frequencies
    • D. all of the above
      • Discuss
    • 9. A good dielectric should have

    • Options
    • A. low losses
    • B. good heat conductivity
    • C. high intrinsic strength
    • D. all of the above
      • Discuss
    • 10. At T = 0, the resistivity of a perfect single crystal of a metal is

    • Options
    • A. 0
    • B. low
    • C. high
    • D. finite
      • Discuss

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