A hot liquid is kept in a big room. The logarithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an___________________?
Correct answer: B. Straight line
- A. Ellipse
- B. Straight line
- C. Parabola
- D. Circular arc
Explanation
For a body cooling in a large surroundings at nearly constant temperature, Newton's law gives dT/dt proportional to the temperature difference. Integration makes ln of that difference vary linearly with time.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
Practise Heat Transfer Operations
645 free Heat Transfer Operations MCQs from Chemical Engineering, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemical Engineering questions like this
Chemical Engineering is on this paper prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for it.
More Heat Transfer Operations questions
Heat transfer efficiency leading of energy conservation in a heat exchanger can be achieved by____________________?
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?
Prandtl and Reynold's analogies are identical for Prandtl number value of__________________?
A hot body will radiate heat most rapidly, if its surface is___________________?
Prandtl number is the ratio of________________?
Rate of heat transfer by vaporisation from pools of water is affected by the ____________________?