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When a shaft in the system turns a pump to pump water out of the system, the shaft work is

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When a shaft in the system turns a pump to pump water out of the system, the shaft work is

(a) Positive

(b) Negative

(c) Zero

(d) None of the mentioned

The question was asked during a job interview.

This key question is from Energy Balances in portion Energy Balances of Chemical Process Calculation

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The correct choice is (b) Negative

To elaborate: Work is done by the system.

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