The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m2. The flux, when the element temperature is increased to 1000°C for the same furnace temperature is_____________________?

Related Mcqs:

Evaporator tubes are generally_____________________?

A. Horizontal B. Vertical C. Inclined D. Random...

Which of the following is directly concerned with the heat transfer ?

A. Strouhal number B. Sherwood number C. Euler number D. Grashoff number...

The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is__________________?

A. 165.4 B. 167.5 C. 172.5 D. 175...

Stefan-Boltzmann law applies to _____________ body?

A. Black B. White C. Grey D. Any colour...

The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the________________ ?

A. Solution has an elevation of boiling point B. Evaporators operate under vacuum C. Evaporators operate at atmospheric pressure D. None of these...