T-52a cipher machine
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1st problem
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We know everything (the internal key and the message key).
If, moreover, the working of the machine T-52a is known, the 
message can easily be decrypted.

2nd problem
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The internal key is known. We know the beginning of the message.
We also know the starting position of 5 wheels. 

3rd problem
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We have plenty of messages in depth (17) and another longer message.
We know the beginning of one of superposed messages.
Moreover we know the Inner-key. That should be enough to find the key. 
You can use paper and pencil.

4th problem
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We know the beginning of the message. The message is not short 
(500 characters).

5th problem
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We have plenty of messages in depth (32) and another longer message.
You can solve this problem with paper and pencil. A computer software 
can help.

6th problem
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The problem is hard, indeed we know nothing (just the Language).
But the message is long (about 3000 character). You can use statistical
methods.

7th problem
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We have only the cryptogram and it is very short (about 1200 character).

8th problem
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We have only the cryptogram and it is very very short (about 800 character).

9th problem
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The message key is known and the cryptogram is short (about 500 character).

10th problem
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The beginning of the message is known and the cryptogram is very short 
(about 200 character).

8th problem
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We have only the cryptogram and it is very very short (about 600 character).