If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density A. increases B. decreases C. remains the same D. doubles Explanatory answer : B Flux density = flux / area So if area increases, flux density decreases. ...

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When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage [A] increases [B] decreases [C] remains constant [D] reaches zero Answer: A In a generator induced emf is proportional to speed hence if speed increases,induced emf also increase...

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Which alternator more suitable for high-speed system ?

Which alternator more suitable for high-speed system ? A. Salient pole B. non salient pole C. Both (a)& (b) D. none of these Answer: non salient pole, because salient pole alternators are mechanically weak...

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Bundled conductor are mainly used in high voltage overhead transmission lines to-(GATE-EE-2003)

Bundled conductor are mainly used in high voltage overhead transmission lines to-(GATE-EE-2003) A. reduce transmission lossesB. increasing mechanical strength of the lineC. reduce coronaD. reduce sag Answer: to reduce coron...

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A 4 point starter is used to start and control the speed of a (GATE-EE-2011)

A 4 point starter is used to start and control the speed of a (GATE-EE-2011) (A) dc shunt motor with armature resistance control (B) dc shunt motor with field weakening control (C) dc series motor (D) dc compound motor Answer: option (A) The armature current of DC shunt motor Ia = (V- Eb) /Ra. at the time of starting, Eb = 0. If the full supply voltage is applied to the motor, it will draw a large current due to low armature resistance. A variable resistance should be connected in series with the armature resistance to limit the starting...

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