Filament Lamp Multiple Choice Questions and Answers


31.  In filament lamps coiled coil filaments are used in


   A. Coloured lamps

   B. Low wattage lamps

   C. Gas field lamps

   D. Higher wattage lamps


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C. Gas field lamps

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32.  Magnesium vapour in a filament lamp gives


   A. Green colour light

   B. Pink colour light

   C. Blue colour light

   D. White colour light


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A. Green colour light

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33.  Which gas is sometimes used in filament lamps ?


   A. Nitrogen

   B. Carbon dioxide

   C. Aragon

   D. Krypton


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A. Aragon

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34.  The gas used in a gas filled filament lamp is


   A. Helium

   B. Oxygen

   C. Nitrogen

   D. Ozone

   E. Carbon monoxide


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C. Nitrogen

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35.  Filament lamps normally operate at a power factor of


   A. Unity

   B. 0.8 lagging

   C. 0.5 lagging

   D. 0.9 lagging


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A. Unity

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