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.Management Sciences
Category: Chemical Heat Transfer
Maximum heat transfer rate is obtained in ______________ flow?
A. Laminar
B. Turbulent
C. Creeping
D. Transition region
Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is __________________?
A. In the central core of the fluid
B. Uniformly distributed throughout the fluid
C. Mainly confined to a thin film of fluid near the surface
D. None of these
Pick out the wrong statement?
A. Orifice baffles are never used in a shell and tube heat exchanger
B. Pressure drop on the shell side of a heat exchanger depends upon tube pitch also
C. In a horizontal tube evaporator, surface blanketing by air is avoided
D. Split ring type and pull through type floating heads are two commonly used floating heads is
heat exchangers
A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the _______________ number?
A. Condensation
B. Grashoff
C. Stanton
D. Brinkman
Heat exchanger tubes are never made of_________________?
A. Plain carbon steel
B. Stainless steel
C. Lead
D. Copper
Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?
A. 0.2 D
B. 0.5 D
C. 0.66 D
D. 0.80 D
Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?
A. 0.4 – 0.6
B. 1-1.3
C. 1.8-2
D. 2 – 2.4
The maximum heat transfer co-efficient from steam heating will be attained when the steam is_________________?
A. Supersaturated
B. Saturated
C. Wet
D. None of these
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has _________________?
A. Lower heat transfer area
B. Lower steam economy
C. Higher steam economy
D. Higher solute concentration in the product
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