# Search results ### Help Support Professional Engineer & PE Exam Forum: 1. ### Effective annual interest rate?

If a student makes monthly deposits of 1,200 into an account with a nominal annual interest rate of 4.5% compounded monthly, will he have enough after 5 years to purchase a \$105,000 property in cash? However, the answer used i = 4.5%/12 = 3.75% Where is my mistake in using the formula?
2. ### How to convert non-annual interest rate to annual interest rate?

If a student makes monthly deposits of 1,200 into an account with a nominal annual interest rate of 4.5% compounded monthly, will he have enough after 5 years to purchase a \$105,000 property in cash? However, the answer used i = 4.5%/12 = 3.75% Where is my mistake in using the formula?
3. ### Is anyone using Anki app for the pe power exam?

I started using Anki app for the pe power exam, if anyone is interested we can share decks!
4. ### study partner

I am studying for the pe does anyone want us to study together and share knowledge to better our understanding? I am willing to study share my email
5. ### Generator internal voltage

The question: The answer: However, I think the answer is wrong, it should be: Vi = Vt + Id*Xd = 1+ 0.97*1.1j = 1.46 pu So, the voltage is 1.46 * 250 kV = 365.6 kV Do you agree?
6. ### Complex Imaginary question

I think it's a mistake since the angle for the current should be kept -34.9. Am I right?
7. ### Motion in a magnetic field

Current: Index finger pointing out of the paper. Mag. field: Middle finger pointing right. Force: Thumb pointing UP not DOWN.
8. ### How does starting torque increase by increasing rotor resistance?

The solution is A. But, from the below attachment the resistance of the rotor IS related to the MAXIMU torque! So, in the question saying that the maximum torque is independent of the rotor resistance is wrong. What do you think?
9. ### Induction motor highest real power condition

The question: The answer: I am confused isn't peak power is at peak torque i.e. breakdown torque? Which is at just above 0 RPM?
10. ### Induction motor with reversing stator magnetic field

The answer: The strength of the torque depends on the difference in speed between the stator's rotating magnetic field and the rotor's rotation. The larger the difference in speed the greater the induced voltage, current and torque. When the motor is starting up, let’s assume the magnetic...
11. ### What type of connection configuration for the three-phase transformer bank shown

Can anyone help. I am confused about the secondary only.
12. ### what is the fault level of paralleled transformers?

When paralleling transformers the fault level at the bus is it the sum of the individual transformer fault level?
13. ### Transformer core (eddy + hysteresis) losses

The question is: The solution is: However, from the NCEES handbook P#58 For Eddy current losses I think they will not change. For the Hysteresis losses the flux is raised to a power greater than 1, so, I think it would actually reduce. right?
14. ### Delta-wye phase shift

For an ABC (positive) phase sequence. The secondary line voltage leads the primary voltage by 30 degrees. right?
15. ### open-delta transformer supplying single phase loads

How to size an open delta transformer that is required to supply both three phase and single phase loads?
16. ### Complex Imaginary Question

D is NOT true! My question is in the exam how will I know which one to choose?
17. ### Step down autotransformer Question

Per NEC Handbook Nse + Nc = 1440, Nc = 1200, SW = 60 kVA. Since it's a step up autotransformer: Sio = 60 kVA * 1200 / 1440 = 50 kVA. However, the answer is Where is my mistake?
18. ### Certified Green Building Engineer

Hi, Can we have a forum for The Association of Energy Engineers (AEE)? They have many good certificates, the one I am interested in is AEE's Certified Green Building Engineer. https://www.aeecenter.org/certifications/certifications/green-building-engineer What do you think guys?
19. ### Harmonics in neutral conductor

Can someone explain?
20. ### Complex Imaginary Q#3

I think the answer should be 1/1.5, because the load impedance |Z| is 227 ohm and it will be reflected to the transformer primary?