A. Rate = Driving force × Resistance
B. Driving force = Rate × Resistance
C. Resistance = Driving force × Rate
D. Rate = Resistance/Driving force
Related Mcqs:
- Pick out the correct statement ?
A. 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
B. In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
C. In unsteady state heat conduction, heat flows in the direction of temperature rise
D. In heat transfer by forced convection, Grashoff number is very important - Pick out the correct equation ?
A. jH = (St)(Pr)2/3 = f/2
B. jH = (St)(Pr)1/3 = f/2
C. jH = (St)2/3(Pr) = f/2
D. jH = (St)1/3(Pr) = f/2 - Pick out the correct statement ?
A. Higher is the temperature of the radiating body, higher is the wavelength of radiation
B. Logarithmic mean area is used for calculating the heat flow rate through a thick walled
cylinder
C. The wavelength corresponding to maximum mono-chromatic emissive power increases with
rise in temperature
D. Solid angle subtended by the finite surface at the radiating element is called the angle of
incidence - Choose the correct equation ?
A. Nu = (Re) (Pr) (Gz)
B. Nu = (Re) (Pr) (St)
C. Nu = (Re) (Pr)
D. Nu = (Pr) (St) - Which of the following is directly concerned with the heat transfer ?
A. Strouhal number
B. Sherwood number
C. Euler number
D. Grashoff number - Which of the following has maximum thermal conductivity ?
A. Iron
B. Coal
C. Nitrogen
D. Tar - A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun ?
A. Yellow paint
B. White paint
C. Black paint
D. Grey paint - Which of the following has the minimum absorptivity ?
A. Aluminium foil
B. Coal dust
C. Refractory bricks
D. Iron plates - Which of the following is generally considered as opaque surface towards radiations ?
A. Gases
B. Solids
C. Liquids
D. Both B. and C. - Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
A. Dittus-Boelter equation
B. Sieder-Tate equation
C. Nusselt equation
D. None of these
