Answer :
Final answer:
The power unit in a combination vehicle is the tractor, responsible for generating power to pull the vehicle. It is essential for the vehicle's movement and operation.
Explanation:
Power unit in a combination vehicle refers to the tractor, which is the component that generates power to pull the vehicle and attached implements. It is typically equipped with an engine connected to the drive train that propels the vehicle forward.
In the context of a combination vehicle like an agricultural tractor, the tractor's drive axle is an important part for distributing power to the wheels efficiently, supporting the vehicle's movement.
Duals in a combination vehicle are additional sets of wheels that can improve traction and load-carrying capacity, but the primary power unit responsible for propulsion is the tractor.
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