Corona Loss | Transmission And Distribution Objective Type Questions and answers


46.  Corona occurs between two transmission conductors when they


   A. Have high potential difference

   B. Are closely spaced

   C. Carry DC power

   D. Both A and B


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D. Both A and B

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47.  In humid weathers, corona occurs at a voltage


   A. Much less then that needed in fair weather

   B. Much higher than that needed in fair weather

   C. Equal to that needed in fair weather

   D. None off the above


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A. Much less then that needed in fair weather

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48.  Compared with a solid conductor of the same radius, corona appears on a stranded conductor at a lower voltage, because stranding


   A. Assists ionisation

   B. Make the current flow spirally about the axis of the conductor

   C. Produces oblique sections to a plane perpendicular to a axis of the conductor

   D. Produces surfaces of smaller radius


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D. Produces surfaces of smaller radius

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49.  The good effect of corona on overhead lines is to


   A. Increase the line carrying capacity due to conducting ionised air envelop around the conductor

   B. Increase the power factor due to corona loss

   C. Reduce the radio interference from the conductor

   D. Reduce the steepness of surge fronts


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D. Reduce the steepness of surge fronts

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50.  Corona loss in a DC line


   A. Less than that in AC line operating at same rms voltage

   B. More than that in AC line at same rms voltage

   C. Same as in AC linear equal rms voltage

   D. None of the above


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A. Less than that in AC line operating at same rms voltage

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