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

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dFourier’s law

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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

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bconvection

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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

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

✓


cboth the fluids .at exit are in their hottest state

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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

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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

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cemissive power and absorptivity are constant for all bodies

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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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