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Q#1
Network Basics
GATE EE 2014
NAT
+2 marks
-0 marks
An incandescent lamp is marked 40W, 240V. If resistance at room temperature 
is 
and temperature coefficient of resistance is 
, then its ‘ON’ state filament temperature is 
is approximately______________.
Explanation:
Resistance in ON state = 
1440 = 120
= 
= 2444.44 
T – Troom = 2444.44
T = 2444.44 + 26 = 2470.44
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