The nature of flow of a fluid inside a tube i.e., whether it is turbulent or laminar, is ascertained by
A.Flow velocity
B.Tube size
C.Surface conditions
D.Viscosity of fluid
E.Reynolds number
Category: Heat Transfer Mcqs
At all wavelengths and temperatures the monochromatic emissivity of a white body is equal to
A.Zero
B.0.1 to 0.5
C.0.5
D.0.5 to 1
E.Unity
The material preferred for the fabrication of fruit juice concentrator is
A.Cast iron
B.Mild steel sheet
C.Stainless steel sheet
D.Copper
E.Brass
The wavelength for maximum emissive power is given by
A.Planck’s law
B.Fourier’s law
C.Wein’s law
D.Stefan Boltzman’s law
E.Kirchhoff’s law
Gases have poor
A.Reflectivity
B.Absorptivity
C.Transmissivity
D.Absorptivity + transmissivity
E.Reflectivity + absorptivity
Fouling factor
A.Is dimensionless
B.Measures the heat transfer efficiency
C.Is virtually a factor of safety in heat exchanger design
D.Is used when a liquid exchanges heat with a gas
E.Is used only in case of Newtonian fluids
The highest value of thermal conductivity is expected for
A.Solid ice
B.Melting ice
C.Water
D.Boiling water
E.Steam
A radiation shield should have
A.low reflectivity
B.high reflectivity
C.high emissivity
D.None of the above
