Q. High pressure mercury vapour lamp has three pin bayonet cap lamp holder. This is done for __.

A
Make a three phase connection
B
Prevent wrong connection
C
Earth the lamp
D
None of the above
Solution:

With its familiar “push and twist” action, the “bayonet cap” (also known as BC or B22d cap) is used on most regular light bulbs. It is 22mm in diameter and with two locating lugs. This is done to prevent wrong connections.

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