Does the U.S. citizen spouse need to be present for the husband's green card interview at the consulate?

NO, US citizen spouse is not required for interview at consulate.

U.S. citizen spouse applying for husband's green card through consular processing. How long before the interview at consulate?

It takes around 6 months to get approved I-130 application from Service Center and then at present, NVC is backlogged and at least 4 months to get...

1. My spouse has her OPT expiration on February 2016. If she gets EAD from TPS, what happens to her OPT EAD ?

She can only keep one EAD, either TPS or OPT EAD.

It is your choice to keep it or let it go. If you have other documents to prove your marriage, you can submit the copy you have and if USCIS needs...

With approved I140, am I eligible for H1B cam exempt?

Yes, your employer can file H-1B for 3 years extension once I-140 is approved, no matter what visa you have now

Nonimmigrant visa waiver for 10 year ban at consulate

Most prabably consulate will not give visa,as you can file Waiver for nonimmigrant visa, but there is immigrant intent involved and will be...

You can write Present becuase you are still living at the address

My friends son was arrested for theft by shoplifting in 2009 and was deported to Mexico. He entered without inspection in 2010,

No, he is not eligible for it and will not be able to file it.

What shall i wright for unanswered question in I-864?

you can write none or N/A for questions you don't have any answer

Yes, it needs to be signed within six months of filing the I-918 application.