Answer / ashutosh khadgaray

2 coz

P=VICOS(Fi)
60=300*I*0.8
I=.125

0.125 for 1 bulb so for 2 bulb it will be 0.25

Answer / ramamurthy

20 of them
4 groups of lamps in series, with each group having 5 lamps
in parallel

Answer / dwara

Both ans are correct. Rammamurthy's ans is for DC where as Ashutosh Khadgaray's ans is for AC

Answer / kapil joshi

Only 1 Bulb
Because Total Power = 300 * 0.25 = 75 W
Required Power For 2 Bulb =2* 60 = 120 W
which is greater than 75 W
So we can use only 1 bulb

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