Mechanical Engineering MCQs

Page No. 152

The value of the wavelength for maximum emissive power is given by ___________________?


aWien’s law


bPlanck’s law


cStefan’s law


dFourier’s law


View Answer Wien’s law

The unit of overall coefficient of heat transfer is___________________?


akcal/m2


bkcal/hr °C


ckcal/m2 hr °C


dkacl/m hr °C


View Answer kcal/m2 hr °C

All radiations in a black body are___________________?


areflected


brefracted


ctransmitted


dabsorbed


View Answer absorbed

According to Kirchoff’s law, the ratio of emissive power to absorptivity for all bodies is equal to the emissive power of a _________________?


agrey body


bbrilliant white polished body


cred hot body


dblack body


View Answer black body

Joule sec is the unit of_________________?


auniversal gas constant


bkinematic viscosity


cthermal conductivity


dPlanck’s constant


View Answer Planck’s constant

The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?


aconduction


bconvection


cradiation


dconduction and convection



In counter flow heat exchangers_________________?


aboth the fluids at inlet (of heat ex¬changer where hot fluid enters) are in their coldest state


bboth the fluids at inlet are in their hot¬test state


cboth the fluids .at exit are in their hottest state


done fluid is in hottest state and other in coldest state at inlet



Fourier’s law of heat conduction is valid for_________________?


aone dimensional cases only


btwo dimensional cases only


cthree dimensional cases only


dregular surfaces having non-uniform temperature gradients



LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?


ahigher


blower


csame


ddepends on the area of heat exchanger


View Answer higher

According of Kirchhoff’s law______________________?


aradiant heat is proportional to fourth power of absolute temperature


bemissive power depends on temperature


cemissive power and absorptivity are constant for all bodies


dratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body



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