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What is the ratio of preventive maintenance and total maintenance in machinery-manufacturing industry?

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in Casting-Forming-Welding I by (687k points)
What is the ratio of preventive maintenance and total maintenance in machinery-manufacturing industry?

(a) 1 : 10 men

(b) 1 : 2.69 men

(c) 1 : 2.37 men

(d) 1 : 3.77 men

This question was addressed to me in a national level competition.

The query is from Elements of Preventive Maintenance topic in portion Preventive Maintenance in Foundries & Metal Casting Process of Casting-Forming-Welding I

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The correct option is (b) 1 : 2.69 men

The best explanation: According to the various needs and type of works in different industries, the ratio of preventive maintenance and total maintenance differs. In a machinery manufacturing industry, the ratio is 1 : 2.69 men.

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