M

Mr. Dubey • 52.30K Points
Coach 

Q. A steel sphere of radius 0.1 m at 400°K is immersed in an oil at 300°K. If the centre of the sphere reaches 350°K in 20 minutes, how long will it take for a 0.05 m radius steel sphere to reach the same temperature (at the centre) under identical conditions? Assume that the conductive heat transfer co-efficient is infinitely large.

(A) 5 minutes
(B) 10 minutes
(C) 20 minutes
(D) 40 minutes
Correct : Option (A)

Share

Discusssion

Login to discuss.

Be the first to start discuss.

Related MCQs

Q. The area of maximum induced field strength using a yoke is:

Q. The moving parts of a machine which weigh 1 tonne perform vertical simple harmonic motion with an amplitude of 2.5 cm and a period of 0.5 sec. The bas

Q. A liquid mixture contains 30% o-xylene, 60% p-xylene and 10%. m-xylene (all percentages in w/w). Which of the following statements would be true in re

Q. If the tearing efficiency of a riveted joint is 75%, then the ratio of diameter of rivet to the pitch is equal to

Q. Reaming and counter boring can be performed by

Q. When bevel gears having equal teeth and equal pitch angles connect two shafts whose axes intersect at right angle, then they are known as

Q. Which of the following is true about the extrusion process?

Q. Heat exchangers are classified into how many categories?

Q. The speed of sound will be maximum through

Q. In jet engine the compression ratio