To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?
A. Alloys must be used
B. Nitrogen be used instead of inert gas
C. Envelope is fabricated with quartz
D. Envelope is fabricated with copper
Answer:C
To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?
A. Alloys must be used B. Nitrogen be used instead of inert gas C. Envelope is fabricated with quartz D. Envelope is fabricated with copper
Explanation: The envelope is fabricated with quartz to allow high operating temperatures. Tungsten filament and inert gas are generally used and are not modified.