Computer Programming MCQs

5739 MCQs  (Page 488 of 574)

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When the motor is at its maximum speed then back emf will be______________?
A. Maximum
B. Zero
C. Intermediate values
D. No back emf
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Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic_____________?
A. Retaintivity
B. Permeability
C. Flux
D. Hysteresis
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An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called_____________?
A. Induced current
B. Eddy current
C. Back emf
D. None of the above
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Transformer works on the principle of________________?
A. Lenzs law
B. Faradays law
C. Mutual induction
D. Law of conservation of power
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Magnetic compass needle will be deflecting if it is kept near________________?
A. Static charge
B. Soft iron
C. Semi-conductor
D. Accelerating charge
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Long distance transmission is easy for________________?
A. D.c voltage
B. A.c voltage
C. Half a.c voltage
D. Half d.c voltage
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The out put voltage of a transformer is 3 times the input voltage then turns ratio will be________________?
A. 3-jan
B. 3
C. 1
D. 6
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A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience______________?
A. A torque about horizontal axis
B. A torque about vertical axis
C. An upward force along the axis
D. No resultant force
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A.C can not be used for_______________?
A. Producing heat
B. Producing light
C. Magnetizing iron
D. Producing magnetic field
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The emf induced in a coil by a changing magnetic flux may have unit as______________?
A. Ms-1a
B. Ms-2a-1
C. Kgms2a-1
D. Kgm2s-1a-1
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Word of the Day
17 Jul
Flagrant
(of an action considered wrong or immoral) conspicuously or obviously offensive.
انتہائی برا، قابل مذمت، فاش

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