Full Floating Piston Pin MCQs with Explanation

Quick Notes

Full Floating Piston Pin — Easy Revision

A full floating piston pin is free to rotate both in the piston boss and in the small end of connecting rod.

It is not rigidly fixed either to the piston or to the connecting rod.

Circlips are fitted in grooves in the piston boss to prevent side movement of the pin.

Full floating piston pins are commonly used in heavy load engines.

MCQs

1) In a full floating piston pin:

A. Piston pin is free in piston bore and small end of connecting rod

B. Piston pin is tight in piston rod and free in small end of connecting rod

C. Piston pin is tight in small end and loose in piston

D. Piston pin is tight in both bore and small end

2) What is the purpose of circlips in a full floating piston pin arrangement?

A. To increase fuel pressure

B. To prevent side movement of the piston pin

C. To lock the connecting rod permanently

D. To reduce compression pressure

3) Which of the following statements is correct about a full floating piston pin?

A. It is mainly used in heavy load engines

B. It is fixed to the piston by screw

C. It is fastened to connecting rod with clamp, screw and nut

D. It is tight in both piston and connecting rod

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