Chaff-cutter is driven by
A. Hand
B. Bullocks
C. Electric power
D. All of the above

Hint: A chaff cutter is a mechanical device used to cut straw or hay into small pieces. Chaff-cutter allows the digestion of the animal and prevents any portion of its food from being rejected by animals.

Complete answer: Chaff cutters have developed from simple machines into standard industrial machines that can be operated at different speeds and can achieve different chaff cutting lengths in relation to the form of animal preference. New chaff cutter machines include a portable chaff cutter powered by a tractor, where chaff cutters and load trolleys can be used in the field. A mechanical system for cutting straw or hay into small pieces to feed the livestock is the Chaff cutter. Bajra, jawar, berseem, sugarcane, paddy, grass, groundnut, etc. are usually used to chop dry or green fodder. There are three kinds of chaff-cutters, viz., hand-operated, power-operated and bullock powered. A portable chaff cutter is driven by a tractor, where chaff cutters can be used in the field and fill trolleys, including modern chaff cutter machines. Therefore, chaff cutters can be driven by hand, bullocks, electric power and diesel.
So, option D is the correct answer.

Note: Engineered chaff cutter (table model) manufacturing system is used in standardized fodder chopping for livestocks or agro industry raw materials. The product range is robust, superior in operation and needs less maintenance and is available in 2 H.P. Model of the single-step table. Chaff cutters are available on the market fitted with the following requirements for the electric motor, pulley and belt.