Discussion
The draft and total power requirement of a rotary cultivator operating in concurrent mode as compared to a spring tyne cultivator of equal cutting width under the same operating conditions, respectively are
Answer: C
Compared with the spring tyne cultivator, the rotary cultivator needs lower draft and higher total power.
In the concurrent (forward-rotating, down-cut) mode the rotor blades cut the soil while turning in the same direction as the wheels, so they push the machine forward. Much of the energy then comes through the PTO rather than as a pull at the drawbar, and the draft can be small or even negative.
Total power is nevertheless higher, because the rotor cuts and pulverises the soil much more finely than a tyne that only loosens and stirs it, and that extra soil breakage costs energy. So 'higher and higher' and 'higher and lower' get the draft wrong, and 'lower and lower' misses the extra PTO power.
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