Related Questions

Which of the following is the commonly used type of electromagnets ?
A Flat-faced armature type
B Horse shoe type
C Flat-faced plunger type
D All of the above
The design of electromagnets is based upon which of the following fundamental equations ?
A Force equation
B Magnetic circuit equation
C Heating equation
D Voltage equation
E All of the above
are used for construction of core of electromagnets.
A Soft magnetic materials
B Hard magnetic materials
C Either (A) or (B)
D None of the above
If a bar magnet is __, the two pieces form two complete magnets, each with north and south pole.
A broken
B broke
C breaking
D break
Permanent magnets are made of high carbon steel and
A 15% of cobalt
B 20% of cobalt
C 35% of cobalt
D 45% of cobalt
Those materials are well suited for making permanent magnets which have ________ retentivity and ________ coercivity.
A Low, high
B High, high
C High, low
D Low, low
Temporary magnets are used in
A loud-speakers
B generators
C motors
D all of the above
Permanent magnets are normally made of
A Alnico alloys
B Aluminium
C Cast iron
D Wrought iron
Hard steel is suitable for making permanent magnets because
A It has good residual magnetism
B Its hysteresis loop has large area
C Its mechanical strength is high
D Its mechanical strength is low
The use of permanent magnets is. not made in
A magnetoes
B energy meters
C transformers
D loud-speakers

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