Civil Engineering Mcqs

Submitted By: Ali Uppal

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  • The critical radius ‘r’ of insulation on a pipe is given by____________________?
  • In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?
  • A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be__________________?
  • Sensible heat of hot industrial flue gases cannot be recovered by a/an________________?
  • The heat flux in the nucleate boiling regimes is proportional to (where, ΔT = excess temperature) ?

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