Sajda-e-Sahw

In which of the following cases will sajda-e-sahw be waajib

Q: What is the case if one recites in his Salaah:

  1. Surah fatiha (right after one another) twice in one of the first two rakats.
  2. Surah fatiha after the surah one has read after surah fatiha.
  3. Surah fatiha twice in the last two rakaats.
  4. At-tahiyyaat twice in the first sitting.
  5. At-tahiyyaat twice in the last sitting one after another.
  6. At-tahiyyaat again after the durood ibrahimiyyah
  7. Durood ibrahimiyyah one after another.

In which cases one must repeat the prayer as makruh tahrimi act was carried out?

Sajda-e-sahw in a makrooh time

Q: I read that if after the salaam of the salaat a makruh time enters and there was a sajdah sahw to be made, then one is absolved from doing sajdah sahw. But he must repeat the whole salaah. For example, if after the salaam in Fajr the sun has risen, then one should not do sajdah sahw, but he must repeat the whole salaah later on. The same counts for Asr when after the salaah the makruh time enters (i.e. after the suns rays become yellow/orange meaning when one is able to look at the sun without being dazzeld). Is this true ? The same ruling would apply to someone who forgot the sajdah sahw, or lost wudhu after salaam before the sajdah sahw.

Repeating the salaam because of doubt

Q: If one prays behind the imaam, and after the imaam has finished both taslims the congregation gives the taslim to both sides (this is the custom method in the masjid I am going thus I also follow this) If after the imaams both taslims, I do give taslim to the right side and then to the left side, but I do repeat the taslim to the left side (because of a doubt that I didn’t hear myself saying a small portion of the taslim). 

Did this break my salaat? Did I had to do sajdah sahw or what did I have to do? Is my salaat complete. I didn't repeat it, if I have to repeat it when must I repeat, is this after 5 salaat times are past away since the the order is waived and the salaats after the salaah which has to be repeated are then valid and no need to repeat those salaats also?

In such case is there a circumstance that the taslim to leftside is considered delayed and thus must be sajdah sahw? Or does it not so count since I did it because of a doubt ? In case that the first taslim I thought I had not heard a portion of it, was done correctly, does the addition of the repeating change anything, or is it not to be considered since I am then already out of salaah and nothing matters what I do say after the taslim to the leftside?

Reciting aloud in silent salaahs

Q: If in a silent prayer, during recitation of Surah al Fatiha, how much of it is recited loudly would require sajdah sahw ? Is it correct that according to Abu Hanifa if 1 ayaat is recited loudly it will require sajdah sahw, but according to Imamayn it is 3 ayaat? If one recites ''ihdina's'' and ''liiiin'' loudly in salaah would this require sajdah sahw ? Also in the first two rakaats when Surah Fatiha and a additional surah are to be read, upto to how many recitation of it may be reacited loudly before sajdah sahw becomes due ?