why 3 phase is preferred than 1 phase?

Answers were Sorted based on User's Feedback

why 3 phase is preferred than 1 phase?..

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?..

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?..

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?..

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

More Electrical Engineering Interview Questions

How we can come to know the substation range,without go through any name plate ?

why the weight of oil in transformer is specified (on the nameplate) in litres as well as kilo grams?

You are of electrical field and you are going for software? Why

Can any one know what are the symbols at the down (below) the analog ammeter??? there are 4 symbols which are they ?????

why PD testing for power cables

In a d.c circuit, if current and resistance are known, power (P=I*I*R) can be determined. This relationship also applied to an a.c circuit. Comment the reason for this.

My load is 1635 KW. & current pf is 0.884, I have to improve it for 0.99.Please suggest what KVAR value is needed?

neutral carrying current more than phase in 3phase supply.i want to know the reason?

Why do we require transformer with less specific weight if supply frequency is increased?

Where the excitation is given either stator or rotor in actually in power plants?

What is the size of a 60 watt and 80 watt tubelight?

3. What is Impedance Voltage in Transformer?

Categories
• Civil Engineering (5062)
• Mechanical Engineering (4328)
• Electrical Engineering (16557)
• Electronics Communications (3564)
• Chemical Engineering (959)
• Aeronautical Engineering (214)
• Bio Engineering (96)
• Metallurgy (361)
• Industrial Engineering (253)
• Instrumentation (2963)
• Automobile Engineering (332)
• Mechatronics Engineering (90)
• Marine Engineering (107)
• Power Plant Engineering (170)
• Textile Engineering (198)
• Production Engineering (0)
• Satellite Systems Engineering (90)
• Engineering AllOther (1376)