Q. Controlling heat transfer film co-efficient is the one, which offers ______ resistance to the heat transfer. A. No B. The least C. The largest D. Lower Answer & Explaination Discuss Answer : Option:- C Explanation : Discuss here! No Explaination Available for These Question.
Q. Solid angle is measured in A. Radian B. Ste-radian C. Degree D. None of these Answer & Explaination Discuss Answer : Option:- B Explanation : SI unit of solid angle is steradian.
Q. For perfectly black body, the reflectivity is equal to ............ A. One B. Zero C. Infinity D. None of these Answer & Explaination Discuss Answer : Option:- B Explanation : Perfectly black body is a body who absorb all incident light, thus reflectivity is 0.
Q. In the equation Q = UAΔt; where Δt is A. geometric mean temperature difference. B. arithmetic mean temperature difference. C. logarithmic mean temperature difference. D. difference of average bulk temperatures of hot and cold fluids. Answer & Explaination Discuss Answer : Option:- C Explanation : Discuss here! No Explaination Available for These Question.
Q. In diffuse reflection the angle of A. Incident ≠ Reflection B. Absorption = Transmittion C. Incident = Reflection D. None of these Answer & Explaination Discuss Answer : Option:- A Explanation : Discuss here! No Explaination Available for These Question.
Q. Heat flux is the time rate of heat transfer per A. Length B. Area C. Volume D. none of these Answer & Explaination Discuss Answer : Option:- B Explanation : Heat flux is the time rate of heat transfer per unit area.
Q. In forced convection, the heat transfer depends on A. Re, Pr B. Re, Gr C. mainly Gr D. Re only Answer & Explaination Discuss Answer : Option:- A Explanation : Discuss here! No Explaination Available for These Question.
Q. Prandtl number is the ratio of A. momentum diffusivity to mass diffusivity B. momentum diffusivity to thermal diffusivity C. thermal diffusivity to mass diffusivity D. thermal diffusivity to momentum diffusivity Answer & Explaination Discuss Answer : Option:- B Explanation : Discuss here! No Explaination Available for These Question.
Q. Heat transfer by natural convection is enhanced in system with A. high viscosity B. high co-efficient of thermal expansion C. low temperature gradients D. low density change with temperature Answer & Explaination Discuss Answer : Option:- B Explanation : Discuss here! No Explaination Available for These Question.
Q. At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe ? A. 0.5 B. <0.5 C. >0.6 D. <0.1 Answer & Explaination Discuss Answer : Option:- C Explanation : Discuss here! No Explaination Available for These Question.