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Chemical Engineering Basics

Q1: A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

A 370

B 340

C 320

D 300

ANS:A - 370

In the first 20 seconds, the aluminium ball cools down 100 °C. So, in the next 20 seconds, it cannot further cool 100 °C .

Q2: A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

A 370

B 340

C 320

D 300

ANS:A - 370

In the first 20 seconds, the aluminium ball cools down 100 °C. So, in the next 20 seconds, it cannot further cool 100 °C .



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