Complex Imaginary Test 1 Problem 11

[Wildsoldier PE]

I went thru the morning section on this test and I dont agree with question 11 result.

For complex power

At 3 phase not single phase

I line = S(total)/(Vline to line x Square(3))

This equation doesnt matter if it is Y or Delta

The result show that the I line = 794A, According to the description is not required to use Square(3).....I accept that if the motor is a 2.4KV is line to line and the motor is a single phase motor. But the statement says that the motor is 3-phase so you need to multiply 2.4KV line to line by square of 3 to get the 3 phase voltage.

answer shall be 458Amps

 

[EEVA PE]

I went thru the morning section on this test and I dont agree with question 11 result.
For complex power

At 3 phase not single phase

I line = S(total)/(Vline to line x Square(3))

This equation doesnt matter if it is Y or Delta

The result show that the I line = 794A, According to the description is not required to use Square(3).....I accept that if the motor is a 2.4KV is line to line and the motor is a single phase motor. But the statement says that the motor is 3-phase so you need to multiply 2.4KV line to line by square of 3 to get the 3 phase voltage.

answer shall be 458Amps

I get 458 Amps also.

 

[snerts50]

I went thru the morning section on this test and I dont agree with question 11 result.
For complex power

At 3 phase not single phase

I line = S(total)/(Vline to line x Square(3))

This equation doesnt matter if it is Y or Delta

The result show that the I line = 794A, According to the description is not required to use Square(3).....I accept that if the motor is a 2.4KV is line to line and the motor is a single phase motor. But the statement says that the motor is 3-phase so you need to multiply 2.4KV line to line by square of 3 to get the 3 phase voltage.

answer shall be 458Amps

I get 458 Amps also.

You are correct. I emailed Complex Imaginary directly on Thursday and he is putting together an ERRATA and actually sent me a copy of it.

I believe a couple of your other questions were fixed in this as well, but I dont have it in front of me. Just shoot him an email at the contact info from his website.

 

[Complex Imaginary]

Yes, snerts50 is correcnt. Errata have been issued for this via email. If you have not received it, please contact me.

Josh

 

[ElecPwrPEOct11]

Yes, snerts50 is correcnt. Errata have been issued for this via email. If you have not received it, please contact me.

Josh

I received the errata but the 1 page 'morning session solutions' (p 63) was not updated. It still shows the correct answer as D.