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When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be Correct Answer Acme threads

The correct answer is Option C: Acme threads.

In situations where power is transmitted in one direction only, Acme threads are suitable. Acme threads have a trapezoidal shape, and they are commonly used for power transmission in applications where the load is primarily in one direction. Their design provides efficiency and strength for unidirectional power transfer.

Option A: Knuckle threads is incorrect because "knuckle threads" is not a standard term in the context of screw threads used for power transmission.

Option B: Square threads is incorrect as square threads are also suitable for unidirectional power transmission, but Acme threads are a more common choice for this purpose.

Option D: Buttress threads is incorrect because buttress threads are designed to handle applications where the load is mainly in one direction, but Acme threads are more commonly used for unidirectional power transmission.

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