Mercury Vapour Lamp Multiple Choice Questions and Answers

36.  The luminous efficiency of high-pressure mercury vapour lamps ranges from ........lumens/watt

   A. 30 to 40

   B. 70 to 90

   C. 100 to 120

   D. 150 to 180

37.  A Mercury vapour lamp gives light of

   A. Green colour light

   B. Pink colour light

   C. Greenish blue colour light

   D. White colour light

38.  High-pressure mercury vapour lamps

   A. Are similar in construction to sodium vapour lamps

   B. Need four or five minutes to attend a full brilliancy

   C. Are generally used for general industrial lighting railway yards etc.

   D. All of the above

39.  High-pressure Mercury vapour lamps

   A. The main electrodes are made of tungsten wire in the form of helix

   B. The choke is provided to limit the current to a safe value

   C. In addition to two main electrodes a starting electrode is connected through a high resistance

   D. All of the above

   E. None of the above

40.  Which off the following lambs is a cold cathode lamp ?

   A. Sodium vapour lamp

   B. Mercury vapour lamp

   C. Neon lamp

   D. None of the above

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