Why is maintenance of a machine necessary?

Parts of a machine get soiled.

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Friction increases within the parts over time.

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Efficiency of machine increases over time.

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Wear and tear of parts occur in a machine.

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Solution

The correct options are
A Parts of a machine get soiled.
B Friction increases within the parts over time.
D Wear and tear of parts occur in a machine.
Over the course of use and time, a machine undergoes wear and tear due to various reasons. Also parts get soiled and friction increases within various movable parts of a machine. Efficiency of a machine decreases over time resulting in lower output. Due to the above mentioned reasons, maintenance of machines is crucial for their proper working.

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