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Question

Which actuator type converts compressed air energy into linear motion for clamping during a machining operation?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is

Single-acting cylinder actuator is used to generate linear motion for clamping tasks

A pneumatic actuator is chosen by matching the motion it produces to the motion the job needs, so first identify what clamping requires.

Clamping needs a straight-line pushing force applied in a single direction to hold the workpiece, and once the operation is done the clamp should simply release and return.

A single-acting cylinder does exactly this: compressed air is admitted on one side to extend the piston and generate the linear clamping force.

When the air is released, an internal spring returns the piston to its rest position, so only one powered stroke is needed and air is used economically.

A rotary actuator produces turning motion, not the linear push a clamp needs, so it suits driving or indexing rather than clamping.

A diaphragm actuator is designed for fine pressure-regulating movement, and a double-acting cylinder is used where air must power the piston in both directions, which is more than a simple clamp requires.

For a one-way linear clamp the single-acting cylinder is the correct match.

Single-acting cylinder actuator is used to generate linear motion for clamping tasks

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