Heat Transfer Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer. Prandtl & Grashoff Reynolds Grashoff Both A & B Prandtl & Grashoff Reynolds Grashoff Both A & B ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer For a given ambient air temperature with increase in the thickness of insulation of a hot cylinderical pipe, the rate of heat loss from the surface would First decrease and then increase Increase Decrease First increase and then decrease First decrease and then increase Increase Decrease First increase and then decrease ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Solid angle subtended by the finite surface at the radiating element is called the angle of vision called the view factor. proportional to the square of the distance between surfaces expressed in terms of radians called the angle of vision called the view factor. proportional to the square of the distance between surfaces expressed in terms of radians ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) ∝ 1/t ∝ t Independent of 't' ∝ √t ∝ 1/t ∝ t Independent of 't' ∝ √t ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Heat exchangers operating, when the asymptotic range is reached, Results in abruptly increased velocity None of these Results in making part of the heating surface inactive Provide very large heat transfer co-efficient Results in abruptly increased velocity None of these Results in making part of the heating surface inactive Provide very large heat transfer co-efficient ANSWER DOWNLOAD EXAMIANS APP
Heat Transfer Boiling point elevation of an ideal solution Increases rapidly with temperature rise Both B and C In independent of pressure Decreases rapidly with temperature rise Increases rapidly with temperature rise Both B and C In independent of pressure Decreases rapidly with temperature rise ANSWER DOWNLOAD EXAMIANS APP
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