Magnetic Field | MCQs | Electrical Engineering Questions
We provide MCQ type Questions And Answers which is more helpful to clear fundamentals of electrical. Here , we provided Questions and Answers related to magnetic field.
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| Magnetic Field | MCQs | Electrical Engineering Questions |
All the MCQs are very helpful in competitive exams such that GATE, IELTS, etc. And also useful in interview and viva.
Questions related to magnetic field is provided below with suitable answers.
Question And Answer ( Magnetic Field)
Q.1
Magnetism steel is normal difficult
because
(a)it corrodes easily
(b)it has high permeability
(c)it has high specific gravity
(d)it has low permeability
Ans.
(d)it has low permeability
Q.2
The left hand rule correlates to
(a)current, induced e.m.f. and direc-
tion of force on a conductor
(b)magnetic field, electric field and
direction of force on a conductor
(c)self induction, mutual induction
and direction of force on a conductor
(d).current, magnetic field and direc-
tion of force on a conductor
Ans.
(d).current, magnetic field and direc-
tion of force on a conductor
Q.3
The unit of relative permeability is
(a)henry/meter
(b)henry
(c)henry/sq. m
(d)it is dimensionless
Ans.
(d)it is dimensionless
Q.4.
A conductor of length L has current I
passing through it, when it is placed
parallel to a magnetic field. The force
experienced by the conductor will be
(a)zero
(b)BLI
(c)B2LI
(d)BLI
Ans.
(a)zero
Q.5
The force between two long parallel
conductors is inversely proportional to
(a)radius of conductors
(b)current in one conductor
(c)product of current in two conduc-
tors
(d)distance between the conductors
Ans.
(d)distance between the conductors
Q.6
Materials subjected to rapid reversal of
magnetism should have
(a)large area of B-H loop
(b)high permeability and low hysteresis
loss
(c)high co-reactivity and high reten-
tivity.
(d)high co-reactivity and low density
Ans.
(b)high permeability and low hysteresis
loss
Q.7
Indicate which of the following material
Indicate which of the following material
does not retain magnetism permanently.
(a)Soft iron
(b)Stainless steel
(c)Hardened steel
(d)None of the above
Ans.
(a)Soft iron
Q.8
The main constituent of perm alloy is
(a)cobalt
(b)chromium
(c)nickel
(d)tungsten
Ans.
(c)nickel
Q.9
The use of permanent magnets is not
made in
(a)magnetos
(b)energy meters
(c)transformers
(d)loud-speakers
Ans.
(c)transformers
Q.10
Q.10
Paramagnetic materials have relative
permeability
(a)slightly less than unity
(b)equal to unity
(c)slightly more than unity
(d)equal to that ferromagnetic materials
Ans.
(c)slightly more than unity
Q.11
Degaussing is the process of
(a)removal of magnetic impurities
(b)removing gases from the materials
(c)remonetizing metallic parts
(d)demagnetizing metallic parts
Ans.
(d)demagnetizing metallic parts
Q.12
Substances which have permeability
less than the permeability of free space
are known as
(a)ferromagnetic
(b)paramagnetic
(c)diamagnetic
(d)bipolar
Ans.
(c)diamagnetic
Q.13
Two infinitely long parallel conductors
in vacuum and separated 1 meter between centers when a current of 1
ampere flows through each conductor,
produce on each other a force of
(a)2x10-2N/m
(b)2x10~N/m
(c)2x 10-N/m
(d)2x10-N/m
Ans.
(d)2x10-N/m
Q.14
In the left hand rule, forefinger always
represents
(a)voltage
(b)current
(c)magnetic field
(d)direction of force on the conductor
Ans.
(c)magnetic field
Q.15
Which of the following is a ferromag-
netic material?
(a)Tungsten
(b)Aluminum
(c)Copper
(d)Nickel
Ans.
(d)Nickel
