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  • Question

  • Ferrites have


  • Options
  • A. a low copper loss
  • B. low eddy current loss
  • C. low resistivity
  • D. higher specific gravity compared to iron

  • Correct Answer
  • low eddy current loss 

    Explanation
    Resistivity of ferrites is very high as compared to that of iron. Hence eddy curretns are much less.

    Materials and Components problems

    Search Results

    • 1. The number of valence electrons in acceptor impurity are

    • Options
    • A. 5
    • B. 4
    • C. 3
    • D. 1
      • Discuss
    • 2. In a specimen of ferromagnetic material, as the flux density is increased from zero to 2.5 T, µr will

    • Options
    • A. increase
    • B. decrease
    • C. first decrease then increase
    • D. first increase then decrease
      • Discuss
    • 3. A 200 turn coil has a self inductance of 10 mH. If the number of turns is doubled, all other quantities remaining the same, the self inductance will be

    • Options
    • A. 2.5 mH
    • B. 5 mH
    • C. 20 mH
    • D. 40 mH
      • Discuss
    • 4. The field pattern of a solenoid is similar to that of bar magnet.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A material which is lightly repelled by a magnetic field is known as

    • Options
    • A. diamagnetic material
    • B. non-magnetic material
    • C. ferromagnetic material
    • D. paramagnetic material
      • Discuss
    • 6. A permeable substance is one

    • Options
    • A. which is strong magnet
    • B. which is a weak magnet
    • C. which is a good conductor
    • D. through which magnetic lines of force can pass easily
      • Discuss
    • 7. Which of the following is the poorest conductor of electricity?

    • Options
    • A. Aluminium
    • B. Nichrome
    • C. Copper
    • D. All of the above
      • Discuss
    • 8. In a pure sample of silicon

    • Options
    • A. the number of holes and free electrons is always equal
    • B. the number of free electrons is more than the number of holes
    • C. the number of free electrons and holes is equal at low temperature
    • D. the number of free electrons is less than number of holes
      • Discuss
    • 9. In intrinsic semiconductors, the number of free electrons is equal to the number of mobile holes.

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. Assertion (A): In a parallel plate capacitor having area of plate 1 m2 and plate separation 1 m, the capacitance C and resistance R are given by C = ?0?'r and R = where ? is frequency, ?r' and ?r" are real and imaginary parts of dielectric constant.

      Reason (R): The imaginary part of electric constant is responsible for dielectric losses.


    • Options
    • A. Both A and R are true and R is correct explanation of A
    • B. Both A and R are true but R is not correct explanation of A
    • C. A is true but R is false
    • D. A is false but R is true
      • Discuss

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