Tech Books Yard have 70 Magnetism Induction for Free Download
One of the common application of an air- cored choke.
- A. Radio frequency
- B. Audio frequency
- C. Power supply
- D. Power transformer
- Correct Answer: Option A
The magnetic energy stored in an inductor is ______ current.
- A. Directly proportional to
- B. Inversely proportional to
- C. Directly proportional to the square of
- D. Inversely proportional to the square of
- Correct Answer: Option C
The force between two magnetic poles is ____________ their poles strength.
- A. equal to
- B. directly proportional to
- C. inversely proportional to
- D. directly proportional to the square root of
- Correct Answer: Option B
A t/m is a unit of
- A. Mmf
- B. Emf
- C. Reluctance
- D. Magnetizing force
- Correct Answer: Option D
The permeability of permalloy is
- A. Very much greater than permeability of air
- B. Slightly greater than permeability of air
- C. Slightly less than permeability of air
- D. Equal to the permeability of air
- Correct Answer: Option A
Which of the following is a paramagnetic material?
- A. Carbon
- B. Copper
- C. Bismuth
- D. Oxygen
- Correct Answer: Option D
The core of a magnetic equipment uses a magnetic material with
- A. Least permeability
- B. Low permeability
- C. Moderate permeability
- D. High permeability
- Correct Answer: Option D
Magnetic intensity is a
- A. Phasor quantity
- B. Physical quantity
- C. Scalar quantity
- D. Vector quantity
- Correct Answer: Option D
Residual magnetism refers to the flux density, which exists in the iron core when the magnetic field intensity is
- A. Minimized
- B. Reduced to zero
- C. Maximize
- D. Unity
- Correct Answer: Option B
How many electrons are needed in the valence orbit to give a material’s stability?
- A. 8
- B. 4
- C. 6
- D. 5
- Correct Answer: Option A