As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?

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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...

In Joule’s experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is________________?

A. 40.5 B. 34.4 C. 26.8 D. 25...