Civil Engineering Mcqs

Submitted By: Ali Uppal

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  • 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__________________?
  • The absorptivity of a body is equal to its emissivity _________________?
  • jH factor for heat transfer depends upon the ____________ number?
  • The actual temperature drop across the heating surface of an evaporator depends on the_______________?
  • Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is_______________?

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