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  • Question

  • Hall effect is observed in a specimen (metal or semi- conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is


  • Options
  • A. normal to both current and magnetic field
  • B. in the same direction as current
  • C. in a direction anti parallel to magnetic field
  • D. none of the above

  • Correct Answer
  • normal to both current and magnetic field 

    • More questions

    • 1. The attenuation characteristics of a loaded line is similar to that of

    • Options
    • A. low pass filter
    • B. high pass filter
    • C. band pass filter
    • D. band stop filter
      • Discuss
    • 2. In a single phase full wave regulator feeding R-L load, short gate pulse are not suitable.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. The household radio receiver uses

    • Options
    • A. synchronous
    • B. envelope detector
    • C. radio detector
    • D. none of the above
      • Discuss
    • 4. Which chopper circuit uses saturable reactor?

    • Options
    • A. Auxiliary commutated
    • B. Jones chopper
    • C. Morgan chopper
    • D. Load commutated
      • Discuss
    • 5. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. Fibers have numerical aperture (NA) in the range of 0.15 to 0.4 Fibers with higher NA value would have

    • Options
    • A. reduced losses
    • B. high bandwidth
    • C. reduced losses and low bandwidth
    • D. more losses and low bandwidth
      • Discuss
    • 7. Radar reciever has high sensitivity and low noise figure

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is

    • Options
    • A. 25% of maximum
    • B. 50% of maximum
    • C. 75% of maximum
    • D. none of the above
      • Discuss
    • 9. A characteristic property of crystal is its periodicity of structure.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. The number of distinct Boolean expression of 4 variables is

    • Options
    • A. 16
    • B. 256
    • C. 1024
    • D. 65536
      • Discuss

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