To operate the type of flame failure device which incorporates a lead sulphide cell, it must receive

To operate the type of flame failure device which incorporates a lead sulphide cell, it must receive

To operate the type of flame failure device which incorporates a lead sulphide cell, it must receive




a) heat from flame
b) ultraviolet rays
c) infrared rays
d) heat and radiation
e) a digital signal






Answer: C


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