MCQs of Magnetic fields and magnetic circuits (Electrical Machine - I - 3140913)

Electrical Machine - I (3140913) MCQs

MCQs of Magnetic fields and magnetic circuits

Showing 21 to 30 out of 40 Questions

21.

(i) As the magnetic field strength (H) increases, reluctance? (ii) As the magnetic flux density (B) increases, reluctance?

(a)	(i) Increase (ii) Decrease
(b)	(i) Increase (ii) Increase
(c)	(i) Decrease (ii) Increase
(d)	(i) Constant (ii) Constant

22.

How can a magnetic field be produced?

(a)	Using a permanent magnet
(b)	Electric current
(c)	Using a temporary magnet
(d)	Using a permanent magnet or electric current

23.

Can we see magnetic flux lines?

(a)	Yes
(b)	No
(c)	Depends on the strength of the field
(d)	Only when the field strength is very large

24.

Magnetic Field lines move from _______

(a)	North to south
(b)	South to north
(c)	West to east
(d)	East to west

25.

Which of the following is used to determine the direction of a magnetic field in a current carrying conductor?

(a)	Left-hand thumb rule
(b)	Right-hand thumb rule
(c)	Right-hand palm rule
(d)	Left-hand palm rule

26.

According to Flemming’s left-hand rule, the Middle finger, Index finger, and thumb denotes the directions of ________, ________, and ________ respectively.

(a)	Current, Magnetic Feild, and Force
(b)	Force, Magnetic Feild, and Current
(c)	Force, Current, and Magnetic Feild
(d)	Magnetic Feild, Current, and Force

27.

The relation between any two quantities in Flemings right-hand rules is ________

(a)	Same direction
(b)	Opposite direction
(c)	Perpendicular
(d)	Unrelated

28.

Magnetic field lines in practical circuit seek the path of __________ reluctance.

(a)	Maximum
(b)	Minimum
(c)	Infinite
(d)	Zero

29.

Inside the magnet, field lines travel from?

(a)	North to south
(b)	South to north
(c)	West to east
(d)	East to west

30.

Do magnetic flux lines intersect?

(a)	Yes
(b)	No
(c)	Depends on the situation
(d)	Cannot be determined

Showing 21 to 30 out of 40 Questions