In a 3 phase,400v,4 wire system, 2 incandescent lamps, one
having 230v,100w and the other 230v,200w are connected between
r phase- neutral and y phase-neutral respectively. If neutral
wire breaks which lamp will fuse first and why?
Answers were Sorted based on User's Feedback
Answer / awdhesh
When neutral disconeted bulb are in series so ckt current is same but voltage drop is diffrent.vlt drop is propesanl to R so 100W lamp R is more with respect to 200W. 100 W lamp fuse first.
Is This Answer Correct ? | 36 Yes | 5 No |
Answer / velmurugan
100W lamp will fail first, Although the voltage across 100 w
lamp will be higher (293V), but it will fail because of
effective current (0.489A) which is more than the 100 w
lamp normal current (0.4A). Increase in current cause more
heat and heating element will fail.
Is This Answer Correct ? | 6 Yes | 3 No |
Answer / harsh
It might be .... the Phase issue ...
Phase R is Generally 120 angle ahead of phase Y...
Lets suppose A complax situation here..
We are now going to add an another Load of 300w in phase B
With same voltage drop..
At that time also 100 watt bulb would b fuse First...
Is This Answer Correct ? | 0 Yes | 7 No |
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