Electrical Machine - I (3140913) MCQs

MCQs of Magnetic fields and magnetic circuits

Showing 1 to 10 out of 40 Questions
1 2 3 4
1.
What is a permeable substance?
(a) Any good conductor
(b) Any bad conductor
(c) Any strong magnet
(d) Any substance through which the magnetic lines of force can pass easily
Answer:

Option (d)

2.
Materials having good retentivity are?
(a) Strong magnets
(b) Weak magnets
(c) Temporary magnets
(d) Permanent magnets
Answer:

Option (d)

3.
Magnetic field exists along which of the following?
(a) Moving charges
(b) Stationary charges
(c) Copper
(d) Iron
Answer:

Option (a)

4.
Magnetomotive force is equal to__________________
(a) Current x Number of turns
(b) Current / Number of turns
(c) Current / Number of turns per unit length
(d) Current * Number of turns per unit length
Answer:

Option (a)

5.
Unit of MMF is ______________
(a) A/m
(b) A-m
(c) A
(d) unitless
Answer:

Option (c)

6.
When a bar magnet is broken into two pieces, which of the following are true?
(a) The magnet loses its magnetism
(b) The magnet has only north pole left
(c) The magnet has only south pole left
(d) The magnet turns into two new bar magnets
Answer:

Option (d)

7.
When an electric current flows into the page, what is the direction of the magnetic field?
(a) Clockwise
(b) Anti-clockwise
(c) Cannot be determined
(d) Parallel to the current
Answer:

Option (a)

8.
The relation between the direction of current and the direction of a magnetic field is?
(a) Same direction
(b) Opposite direction
(c) Perpendicular
(d) Unrelated
Answer:

Option (c)

9.
Permeability of free space is also known as _________
(a) Magnetic constant
(b) Electric constant
(c) Electrostatic constant
(d) Magnetostatic constant
Answer:

Option (a)

10.
A substance whose permeability is less than the permeability of free space is?
(a) Diamagnetic
(b) Paramagnetic
(c) Ferromagnetic
(d) Not a magnetic substance
Answer:

Option (a)

Showing 1 to 10 out of 40 Questions
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