This is a timed quiz. You will be given 1800 seconds to answer all questions. Are you ready?
1800
Working of Dynamo is based on :
Correct! Wrong!
Retentivity is maximum for:
Correct! Wrong!
mmf does not depend on :
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which of the following is most suitable for the cores of electromagnet?
Correct! Wrong!
The relative permeabilty of free space is :
Correct! Wrong!
The principle of dynamically induced emf is utilized in :
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which of the following is not a method of magnetization?
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If the distance between two similar magnetic poles held 1cm apart be doubled, the the force between the poles will be
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A coil of radius R has 400 turns and a self-inductance of 32 mH .What will be the inducatnace of a similar coil of 300 turns?
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Iron is ferromagnetic :
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The unit of permeabilty is :
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The magnitude of statically induced emf depends on the :
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What is the SI unit of magnetic flux?
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A magnet is moved a) Quickly . b) slowly towards a coil. The emf induced in the coil is :
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The relative permeability of Iron is of the order of :
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When a magnet is heated, it
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The relative permeability of a material is 0.999. The substance is:
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Magnetic cores should have
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Which of the following is Paramagnetic?
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Two parallel wires carrying currents in opposite directions :
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The current through a coil of inductance 5 H is decreasing at the rate of 2 A/sec. The emf induced in the coil is :
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Which of the following is a ferromagnetic material?
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Which of the following is diamagnetic :
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Two coils of inductances L1 and L2 are placed close together such that magnetic flux in one coil completely links the other. The mutual inductance between the coils is :
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A long solenoid with 2000 turns is 0.8 m long . What is the magnetizing force in the centre of this solenoid, if the exciting current is 2 A?
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Magnetism Quiz KSEB Sub Engineer
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