A transmission shaft includes

A. counter shaft

B. line shaft

C. over head shaft

D. all of these

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Explanation:

Shafts:

A shaft is a rotating element which is used to transmit power from one place to another.
In order to transfer power from one shaft to another, the various members such as pulleys, gears etc. are mounted on it.

Types of shafts

There are basically two types of shafts:

1. Transmission shaft:

These shafts transmit power between the source and the machines absorbing power.
The countershafts, line shafts, overhead shafts and all factory shafts are transmission shafts.
Since these shafts carry machine parts such as pulleys, gears etc., therefore they are subjected to bending in addition to twisting.

2. Machine shafts