why 3 phase is preferred than 1 phase?

Question Posted / amirtha

4 Answers
15766 Views
Infosys, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

why 3 phase is preferred than 1 phase?..

Answer / vinodh.t,sathavahana ispat ltd

1.constant power :in single phase power varies sinosoidally
from zero to a peak value at twice the supply
frequency.this pulsating nature of power is objectionable
for many application in 3 phase the poiwer supplied at all
instants of time is constant
2.the output of a 3phase machine is greater than that of a
single phase machine for a given volume and weight of
machine.
3.the 3 phase motor are much smaller and cheap than single
phase

Is This Answer Correct ?

18 Yes

1 No

why 3 phase is preferred than 1 phase?..

Answer / mahantesh

Three phase carry large current than a single phase current,for larger loads the cross section of conductor is larger in single phase than three phase and single phase cannot be transmitted to larger distance than the three phase,line losses are small as compared to single phase so we prefer three phase instead of single phase

Is This Answer Correct ?

15 Yes

5 No

why 3 phase is preferred than 1 phase?..

Answer / manish singla

i agree with Reply by Mr. Vinodh.t,sathavahana Ispat Ltd.

Warm Regards,

Is This Answer Correct ?

1 Yes

0 No

why 3 phase is preferred than 1 phase?..

Answer / prasad.v

because in one phase if there is any shortage or short
circuit may happen apart from this if we use one phase
current there may be more possible to low voltage we can see
that some house light will be more dim so if we three phase
if any of the has low voltage we can change the phase so we
are preferring 3 phase than 1 phase

Is This Answer Correct ?

6 Yes

21 No

Post New Answer

More Electrical Engineering Interview Questions

what is the knee point voltage in current transformer

2 Answers

1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.

0 Answers ICS Integrated Computer Solutions,

what's transient & sub- transient reactance means?

2 Answers

How can calculate the earthing strip of Copper/GI for rating of 30kV,discharge current 10KA Lightning arrester.

0 Answers Raychem RPG,

how can i improve the power factor in domestic (230v)

0 Answers Epcos,

why auto transformer connected in star?

1 Answers

hey guys i recently saw a long transmission line in which a sort of balloons in red and white color were hanging at each section.do u have any idea why are they kept for?

3 Answers

what is pressure relief valve in D.G ?state its function?

3 Answers

what is meant by k-rating in isolation transformer?what is k9, k14 stands for?

0 Answers

transformer test

4 Answers

i have 3500 amp load and select current transformer and perches.how i calculate .please understand

0 Answers

what are check points to be checked while charging switchyard?(CT,PT,BREAKER,POWER TRANSFORMER)

1 Answers

For more Electrical Engineering Interview Questions Click Here