PE Power Question for the Week

[spinup]

Question for the Week (QFTW) has been uploaded.

http://www.spinupexams.com/

Many people make the mistake of skipping this week's topic during their studies. These are easy points if this topic is studied a little. Don't leave these points on the table. It can make the difference between passing and needing to retake it.

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Joan

 

[Blak]

Yep, Engineering Economics is an important topic.

 

[spinup]

Question for the Week (QFTW) has been uploaded.

The topic this week is real power.

http://www.spinupexams.com/

Joan

 

[luckyboy886]

Spin-up,

A question on Week 2 problem:

The 3-phase motor is fed from the 3-phase 4600V (phase-to-phase) generator via a 10:1 delta-wye transformer.

On primary side, the phase-to-phase voltage is 4600V --> on secondary side, the phase-to-neutral voltage is 460V.

Should the motor voltage equal to the phase-to-phase voltage of the secondary side of the transformer, which is 460V*sqrt(3) = 797V?

 

[Power12]

Spin-up,

A question on Week 2 problem:

The 3-phase motor is fed from the 3-phase 4600V (phase-to-phase) generator via a 10:1 delta-wye transformer.

On primary side, the phase-to-phase voltage is 4600V --> on secondary side, the phase-to-neutral voltage is 460V.

Should the motor voltage equal to the phase-to-phase voltage of the secondary side of the transformer, which is 460V*sqrt(3) = 797V?

The three phase motor voltage is 460 V. It is correct as shown in the solution.