Discussion
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- Question
The dielectric losses do not depend on frequency.
Options- A. True
- B. False
- Correct Answer
- False
ExplanationDielectric losses vary with frequency.
Materials and Components problems
Search Results
- 1. In a metal, the valence electrons
Options- A. are not shared
- B. are shared only between neighbouring atoms
- C. are shared by all atoms
- D. either (b) or (c) Discuss
Correct Answer: are shared by all atoms
Explanation:
In a metal the valence electrons belong to all atoms.- 2. Assertion (A): A capacitor with imperfect dielectric can be represented by a capacitance in parallel with resistance.
Reason (R): For imperfect dielectrics, dielectric constant has real and imaginary parts.
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
Correct Answer: Both A and R are true and R is correct explanation of A
Explanation:
Imaginary part of dielectric constant is responsible for dielectric losses.- 3. An atom of a rare gas is placed is an electric field E. Then
Options- A. the nucleus will be shifted in the direction of E by an amount which is proportional to E.
- B. the nucleus will not be shifted.
- C. the nucleus will be shifted in the direction of E by an amount which is independent of E.
- D. the nucleus will be shifted in a direction opposite to that of E. Discuss
Correct Answer: the nucleus will be shifted in the direction of E by an amount which is proportional to E.
Explanation:
For equilibrium nucleus is shifted in the direction of E by an amount which is proportional to E.- 4. Many compounds also exhibit semiconducting properties.
Options- A. True
- B. False Discuss
Correct Answer: True
- 5. If Bmax is the maximum flux density, hysteresis loss is proportional to
Options- A. Bmax
- B. B1.6max
- C. B2max
- D. B3max Discuss
Correct Answer: B1.6max
- 6. The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as
Options- A. Matthiessen's rule
- B. Debye rule
- C. Curie rule
- D. Onne's rule Discuss
Correct Answer: Matthiessen's rule
- 7. If m is the mass of electron cloud, the equation of motion of electron cloud in the presence of an alternating electric field is of the form
Options- A.
- B.
- C.
- D.
Discuss
Correct Answer:
- 8. Magnetisation of a material is the magnetic dipole moment per m3.
Options- A. True
- B. False Discuss
Correct Answer: True
- 9. A dielectric material must be
Options- A. insulator
- B. good conductor
- C. resistor
- D. semiconductor Discuss
Correct Answer: insulator
Explanation:
Any material other than insulator will short-circuit the plates.- 10. Fleming's left hand rule is used to find
Options- A. direction of force on a current carrying conductor
- B. direction of flux in solenoid
- C. direction of magnetic field due to a current carrying conductor
- D. direction of induced emf Discuss
Correct Answer: direction of force on a current carrying conductor
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