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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

Stefan Boltzmann law is applicable for heat transfer by __________________?
A conduction
B convection
C radiation
D conduction and radiation combined
Correct Answer: radiation
The unit of Stefan Boltzmann constant is ____________________?
A watt/cm2 °K
B watt/cm4 °K
C watt2/cm °K4
D watt/cm2 °K4
Correct Answer: watt/cm2 °K
Log mean temperature difference in case of counter flow compared to parallel flow will be________________?
A same
B more
C less
D depends on other factors
Correct Answer: more
According to Stefan-Boltzmann law, ideal radiators emit radiant energy at a rate proportional to___________________?
A absolute temperature
B square of temperature
C fourth power of absolute temperature
D fourth power of temperature
Correct Answer: absolute temperature
In free con-vection heat transfer, Nusselt number is function of________________?
A Grashoff no. and Reynold no
B Grashoff no and Prandtl no.
C Prandtl no. and Reynold no
D Grashoff no., Prandtl no and Reynold no
Correct Answer: Grashoff no and Prandtl no.
Which of the following property of air does not increase with rise in temperature ________________?
A thermal conductivity
B thermal diffusivity
C density
D dynamic viscosity
Correct Answer: density
The energy distribution of an ideal reflector at higher temperatures is largely in the range of ___________________?
A shorter wavelength
B longer wavelength
C remains same at all wavelengths
D wavelength has nothing to do with it
Correct Answer: shorter wavelength
The value of Prandtl number for air is about _______________________?
A 0.1
B 0.3
C 0.7
D 1.7
Correct Answer: 0.7
Total emissivity of polished silver compared to black body is___________________?
A same
B higher
C more or less same
D very much lower
Correct Answer: very much lower
The value of the wavelength for maximum emissive power is given by ___________________?
A Wien’s law
B Planck’s law
C Stefan’s law
D Fourier’s law
Correct Answer: Wien’s law
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