A motor works on 30kw.it is working on 440volts.How much amper will be Require

Categories >> Engineering >> Electrical Engineering
Suggest New Category

A motor works on 30kw.it is working on 440volts.How much
amper will be Required?

Question Posted / shafiquemomy

7 Answers
10825 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / a.bala

Hai Ramya
The formula for I= KW/ 1.732x pf x Applied voltage in kv
So
KW =30
pf=0.8
Applied voltage = 440 v =440/1000=.440
30/ 1.732x0.8x.440=49.2 A

Is This Answer Correct ?

7 Yes

1 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / dinesh raj

Voltage =440 V
Power Facter (cos@) = 0.8
Power P = 30kW = 30000W
Formula for 3phase power P = sqr(3)*V*I*cos@
So Current I = P/sqr(3)*V*cos@

I = 30000/1.732*440*0.8
So Required amper = 49.2 A

Is This Answer Correct ?

6 Yes

0 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / a.bala

30 / Rt3xpfx voltage i KV
30/Rt3 x.8x.440= 49.2 A
Consider starter current 1.2 Time from running current
so 49.2 * 1.2= 59 A
sO you will selecte cable and breaker for 60 A.

Is This Answer Correct ?

4 Yes

1 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / ramya

MR bala i con't understand your answer at(30/Rt3 x.8x.440=
49.2 A)
plz clear me this equvation

Is This Answer Correct ?

3 Yes

1 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / ramya

THANKS MR.BALA

Is This Answer Correct ?

0 Yes

0 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / sidhu.k

Mr, bala your answer is correct i dont repeat it
again,thank you, i think ramyas dout is clear.

Is This Answer Correct ?

0 Yes

0 No

A motor works on 30kw.it is working on 440volts.How much amper will be Required?..

Answer / ramendra shukla

Hi Dinesh you are correct but you have made a mistake- in
place of sqr(3) there will be root squre(3)

so Power,P = under root(3) VI Cos@

or P = 1.732 VI cos@

then you are correct while your calculation are correct.

Is This Answer Correct ?

0 Yes

2 No

Post New Answer

More Electrical Engineering Interview Questions

what is different between phase and netural

0 Answers

In pakistan appliances work on 220v at 50hz and in us appliances work on 110v at 60hz what is basic theory to explain it

1 Answers SNGPL,

Why earthing is required for diesel tank?

4 Answers Greaves,

Mathemetical Relation Between KWRH and KWH?

3 Answers UPPCL,

why battery dc voltage become Half when we check with respect to ground for example 120volts + and - terminals and when we check + terminal with Earth thats 60volts why 60volts we can not ground the battery.

6 Answers GE,

what are all the daily preventive maintainance carried out in transformer?

1 Answers

Why is a plain induction motor unsuitable for wide speed control?

0 Answers

Regarding units, for voltage we are denoting Volts as V but in case of current we are not denoting Ampere as A instead as I..Why..? Any technical reason for this..?

1 Answers

what is the difference betn earthed and unearthed cables which is commanly used why?

2 Answers Bhel, Power Grid,

An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?

0 Answers HAL,

how can we calculate the ratio of caustic soda and water in lrs.

0 Answers

What is MSL designation of a motor and same may be provided in details.

0 Answers DAE,

For more Electrical Engineering Interview Questions Click Here