Discussion
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- Question
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.
- Correct Answer
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- 1. 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
- 2. The dielectric losses do not depend on frequency.
Options- A. True
- B. False Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. Magnetisation of a material is the magnetic dipole moment per m3.
Options- A. True
- B. False Discuss
- 7. A dielectric material must be
Options- A. insulator
- B. good conductor
- C. resistor
- D. semiconductor Discuss
- 8. 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
- 9. Which inductor is used at high frequencies?
Options- A. Cast iron cored
- B. Sheet steel cored
- C. Iron alloy cored
- D. Ceramic cored Discuss
- 10. A vacant electronic state moves in the same direction as would a positive charge carrier.
Options- A. True
- B. False Discuss
Materials and Components problems
Search Results
Correct Answer: Matthiessen's rule
Correct Answer: False
Explanation:
Dielectric losses vary with frequency.
Correct Answer: are shared by all atoms
Explanation:
In a metal the valence electrons belong to all atoms.
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.
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.
Correct Answer: True
Correct Answer: insulator
Explanation:
Any material other than insulator will short-circuit the plates.
Correct Answer: direction of force on a current carrying conductor
Correct Answer: Ceramic cored
Explanation:
Cast iron, sheet steel and iron alloy have very high hysteresis and eddy current losses at high frequencies.
Correct Answer: True
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