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.Management Sciences
Category: Chemical Heat Transfer
The purpose of floating head in a heat exchanger is to_________________?
A. Avoid buckling of tubes
B. Provide support for tubes
C. Decrease the pressure drop
D. Facilitate its lengthening, if needed
A black body does not ____________ radiation?
A. Absorb or emit
B. Refract
C. Reflect
D. Both B. & C.
Heat transfer by ____________ may not necessarily require the presence of a medium?
A. Conduction
B. Natural convection
C. Forced convection
D. Radiation
As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the_______________?
A. Temperature of the body only
B. Wavelength of monochromatic radiation
C. Both A. and B.
D. Nature of material of body
Multiple effect evaporation accounts for___________________?
A. Steam economy
B. Lower operating costs
C. Investment economy
D. None of these
Pick out the wrong statement?
A. Reciprocal of the resistance to heat flow is called thermal conductance
B. Unit of thermal conductance is W/°K
C. Thermal conductance of a wall of thickness ‘L’, thermal conductivity ‘k’ and heat flow area ‘A’ is kL/A
D. None of these
The Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is______________?
A. 1.66
B. 88.66
C. 3.66
D. Dependent on NRe only
The range of electromagnetic spectrum important in heat transfer by radiation is ______________ microns?
A. 0.38-0.78
B. 0.5-50
C. 100-1000
D. 5-50
A _____________ evaporator employs an annular downtake?
A. Basket type
B. Horizontal
C. Long tube vertical
D. None of these
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