# Heat Transfer

This set of Thermal Engineering 1 Multiple Choice Questions & Answers (MCQs) focuses on Heat Transfer

Q1 | Thermal conductivity of wood depends on
Q2 | Heat conducted through unit area and unit thick face per unit time when temperature difference between opposite facesis unity,is called
Q3 | Emissivity of a white polished body in comparison to a black body is
Q4 | A grey body is one whose absorptivity
Q5 | A non-dimensional number generally associated with natural convection heat transfer is
Q6 | LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is
Q7 | In counter flow heat exchangers
Q8 | Fourier's law of heat conduction is valid for
Q9 | All radiations in a black body are
Q10 | According to Kirchoff's law, ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a
Q11 | The unit of overall coefficient of heat transfer is
Q12 | According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to
Q13 | The unit of Stefan Boltzmann constant is
Q14 | Stefan Boltzmann law is applicable for heat transfer by
Q15 | The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of aperfectly black body. This statement is known as
Q16 | The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit
Q17 | The ratio of the energy absorbed by the body to total energy falling on it is called
Q18 | 40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity ofthe body be 0.15, then the absorptivity of surface is
Q19 | The amount of radiation mainly depends on
Q20 | The emissive power of a body depends upon its
Q21 | Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by
Q22 | In regenerative type heat exchanger, heat transfer takes place by
Q23 | A perfect black body is one which
Q24 | If the temperature of a solid surface changes from 27°C to 627°C, then its emissive power changes in the ratio of