Computer Programming MCQs

5739 MCQs (Page 487 of 574)

Attempt Computer Programming MCQs Quiz

For electroplating we use_________________?

A. A d.c source
B. An a.c source
C. Any source
D. All of the above

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Energy stored in a magnetic field is given by______________?

A. Li2
B. L2i/2
C. Li2/2
D. Il2

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If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by_____________?

A. Vs/vp = np/ns
B. Vs/vp = ns/np
C. Vp/vs = ns/np
D. Vp/vs = np/ns

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The only difference between construction of D.C generator and A.C generator is that of_______________?

A. Carbon brushes
B. Coil
C. Commutator
D. Magnetic field

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The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core_______________?

A. Decreases the resistance of the solenoid
B. Reduces the effect of eddy current
C. Improves the flux linkage between the turns of the coil
D. Increases the mutual inductance between the solenoid and the core

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A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is_____________?

A. 0 volt
B. 3.125 volt
C. 31.25 volt
D. 0.03125 volt

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Non inductive resistances are used in decreasing______________?

A. Mutual inductance
B. Self inductance
C. Magnetic fields
D. Heating effect

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An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4×10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum speed of the aeroplane is____________?

A. 150msec-1
B. 384msec-1
C. 38.4msec-1
D. 200msec-1

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For long distance transmission the transformer used is_____________?

A. Step down
B. Input voltage and output voltage remain same
C. Step up
D. Amplifier is used

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Which one of the following devices does not function like an electric motor ?

A. Galvanometer
B. Ammeter
C. Voltmeter
D. Transformer

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