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
14552 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

what is basic difference betmeen normal & flame proof motor??

0 Answers Dynamics,

what is differentila pilot supervision in the incomer control panel in the power station?

0 Answers

what is your majour contributions in your present job

0 Answers ESL,

What is the role of ESP(Electro Static Precipitator)in steam power plants? Where it is located? How it works?

1 Answers

how induction motor work as a generator?

2 Answers

Which types of gate insttaled in static switch. Please give me answer.

0 Answers cpgn,

whenever any squirrel or a crow falls on the transformer input line then there is a big explosion and 440 volts of power is being discharged through the neutral line due to which appliances in off mode are also burned.we have earthing for the transformer as well as the bus bar chamber.why is it happening?

1 Answers

Why PT burnts?

2 Answers

why threre are two parallel lines in transformer's symbol?

11 Answers NTPC,

if the power factor is .88 i want to increase the power factor to .99 what number of capacitor is to add?

3 Answers Amway,

Hi, My plant daily consumption is calculated as 3.8MWH but my supplier has sanctioned an power of 2.6MW per day. how can i equal or distinguish this two factors

0 Answers

i m electrical diploma holder i want to do plc $ Scada some body tell me which insitute is best for me near chandigarh

0 Answers

For more Electrical Engineering Interview Questions Click Here