No, it is not. Flip Summons and Normal Summons are different things. Some cards can respond to both, but some can only respond to Normal Summons, and if so, cannot be used against Flip Summons.
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Yes, this is legal. You may perform one Normal Summon or set per turn, and as many Flip Summons as you wish.However you cannot Flip Summon a monster Set that turn, nor if you Flip Summon a monster, turn it face-down in the same turn using an effect, can you Flip Summon it again that turn. Lastly if a monster declares an attack, and is flipped face-down in response, it cannot be Flip Summoned that turn.
A tribute summon is a form of Normal Summon. So that means you can only tribute summon OR normal summon ONCE per turn.
Under normal circumstances, you are only allowed one Normal Summon per turn. A Tribute Summon is a kind of Normal Summon, meaning that if you wanted to do both in one turn, you'll need an effect that specifically lets you, like Double Summon. Note that a special summon that requires tribute, is not a Tribute Summon. You can perform those in the same turn as a Normal Summon.
No, a Synchro Summon is a kind of Special Summon.
Yes, you can, as a Synchro Summon is a special summon, you can perform a Normal Summon on the same turn as one or more Synchro Summons.