Harmonic mean temperature difference is given by_________________?

Related Mcqs:

Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer coefficient is „3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade ?

A. 35.5 B. 43.75 C. 81.25 D. 48.25...

A black body does not ____________ radiation?

A. Absorb or emit B. Refract C. Reflect D. Both B. & C....

To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is _______________?

A. 1-2 heat exchanger B. 1-1 heat exchanger C. 3-2 heat exchanger D. 2-4 heat exchanger...

Steam economy in case of a triple effect evaporator will be _________________?

A. 1 B. < 1 C. > 1 D. Between 0 and 1...

Tube pitch is the _______________ of tube diameters and the clearances?

A. Sum B. Difference C. Ratio D. None of these...