Q 4 Answer

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Your partner has overcalled spades so should have 5 cards and 10 points. You have 17 HCPs and if your partner has one diamond you have a fit and can add shortage points. You are not vulnerable so 5 diamonds.

Your partner has repeated hearts so has 6 cards in the suit. You now have a fit and can add shortage points and so should go to 4H.

This is difficult as you have 16 HCPs and your partner has not bid. You are vulnerable so you should probably PASS.

You have 10 HCPs and cannot bid 2H over 2C (as you would be promising 5 cards), so you should DBL promising both majors, even though you only have 3 cards in spades.