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

Grounding. Dear all at one of my site we checked the amps at the earthing cable to the alternator it was found 125 to 130 A. at the neutal cable in same machine found 146A. in the same plant checked the earthing current on other alternator it was 52A, and neutral 116 A. we are facing problems with our controller and the card was damaged once. can that neutral/GND current be a reason? as there is common grounding for the Alternator,Brkr panel,Transformer?

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