In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and

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?

Question Posted / lata

3 Answers
16119 Views
Eskom, SSC, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and the other 230v,200w..

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

In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and the other 230v,200w..

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

In a 3 phase,400v,4 wire system, 2 incandescent lamps, one having 230v,100w and the other 230v,200w..

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

Post New Answer

More Electrical Engineering Interview Questions

How to find the maximum load(in KW)in a big industry, having motors,lights,lifts etc..?

2 Answers ME,

Utility company give the supply to customer in KVA but bill them for Watt.why?

1 Answers L&T,

Dear friends , I am going attend interview for WARTSILA INDIA LIMITED , power plant .Could any 1 pls send me few questions. the area i have to concentrate? please send it to mikalraj@gmail.com. pls help me out

1 Answers

Safety of dry type transformer

0 Answers Icon,

sir i have a car stereo system and there is jack on him so can u tell me a way to find out their power terminals on the jack or on the circuit board"

0 Answers

What's the difference between a generator using 50Hz and 60Hz? When do we need to use a generator 50Hz and 60Hz?

3 Answers

How many earthing pits are requier to disapper the surge current of one lighting arrester.

3 Answers

what is the diffrence between current transformer and voltage trasformer

3 Answers

Either It Possible a dc Motor to Run On Ac Drive [ Ex : ACS 800 , Yaskawa F7 ] If it is Possible How Pls Inform Me dinesh_elect_eng@yahoo.com

0 Answers

Any body can help me in getting LT panel test procedure.

0 Answers TATA,

Can we loop AC neutral wire with DC neutral wire?

5 Answers ABB,

What are books to be referred for KPTCL exam?

0 Answers

For more Electrical Engineering Interview Questions Click Here