• #### what type of testing you perform first while doing black box testing?

• Nov 16th, 2006

At first we conduct Sanity testing to ensure that the application is stable or not to conduct complete testing on it. Here we are not executing any testcases.

#### satish

• Jul 25th, 2006

If u have time u can start with usability testing.then u start functionality testing.

• #### What is the power ratio between power in Star and Delta circuit?

KaranSorout

• Member Since Jul-2006 | Jul 13th, 2006

The power ratio between Star to Delta is 1:3

Explanation:

Let?s suppose Vs be the supply voltage per phase.

So the line voltage of the supply will be ?3Vs.

Now assume any type of load; for simplicity I?m assuming it a only resistive load.

And let it be ?R? per phase.

Calculation for per phase power; PD= I2R

Where I ? load current (per phase)

And,

I = ?3Vs/R       {as line voltage of the supply is directly applied to the phase of the delta load}

So,

Pd = (?3Vs/R )2R = 3Vs2/R  watts per phase.

For 3 phases:

P3D = 3Pd = 3*3Vs2/R = 9Vs2/R watts.

PS = I2R = (Vs/R)2R = Vs2/R watts

For 3 phases: P3S = 3PS = 3 Vs2/R watts

Conclusion:

P3S / P3D  =  3Vs2/R / 9Vs2/R = 1/3

It may be better concluded by drowing figures. If any variations, can connect to me through karan.sorout@gmail.com

#### RUP KAMAL KUTUM

• Feb 3rd, 2018

Well first you assumed voltage per phase as Vs and Line voltage as sqrt(3) x Vs: Which is for star connection. Then, you assumed the same thing for Delta Connection(where line and phase voltages are t...

#### Anbumozhi R

• Dec 3rd, 2017

Power is Same. Whether it is star to Delta conversion or Delta to star conversion. Power is 1:1

#### mfsi_chinmayb

• Feb 17th, 2012

Cyclomatic complexcity is a methodology to measure the complexity at a certain area of code.In other words it an another way to reach at defect clustering. Cyclomatic complexity is to measure the nu...

#### rameshn3

• Jun 10th, 2008

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