Earthing And Grounding Objective Type Questions and answers

46.  Earthing is necessary to give protection against

   A. Danger of electric shock

   B. Voltage fluctuation

   C. Overloading

   D. High temperature of the conductors

47.  Solid grounding is addopted for voltages below

   A. 100 V

   B. 200 V

   C. 400 V

   D. 660 V

48.  The advantage of neutral earthing is

   A. Freedom from persistent arcing grounds

   B. Over voltages due to lightning can be discharged to earth

   C. Simplified design earth fault protection

   D. All of the above

49.  In a star connected system without neutral grounding, zero sequence currents are

   A. Zero

   B. Phaser sum of phase currents

   C. Same as r.m.s. value of phase currents

   D. Same as peak value of phase currents

50.  The advantage of neutral earthing

   A. Safety of personnel

   B. Reduction of earth fault current

   C. Elemination of arcing ground

   D. None of the above

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