Step 1: Understanding the types of power tillers.
- General purpose power tillers are typically coupled with a rotary tiller for general tasks.
- Pull type tillers are used for operations requiring a steering mechanism.
- Tilling type tillers are used for tasks that involve both rotary and traction work.
- Dog type tillers are generally used for tasks like ploughing, leveling, seeding, and transport.
Step 2: Analysis of options.
- (A) General Purpose: Matches with (I) Two-wheel tractor coupled with a rotary tiller.
- (B) Pull type: Matches with (II) Steering mechanism.
- (C) Tilling type: Matches with (III) Miscellaneous operations for rotary as well as traction work.
- (D) Dog type: Matches with (IV) Used for ploughing, leveling, seeding, and transport work.
Step 3: Conclusion.
Thus, the correct matching is (A) - (I), (B) - (II), (C) - (III), (D) - (IV).
Final Answer:
\[
\boxed{3. (A) - (I), (B) - (II), (C) - (III), (D) - (IV)}
\]