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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

Choose the wrong statement?
A Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
B Viscosity is due primarily to interaction between fluid molecules
C Viscosity of liquids decreases with in-crease in temperature
D Viscosity of liquids is appreciably affected by change in pressure
Correct Answer: Viscosity of liquids is appreciably affected by change in pressure
Choose the correct relationship ?
A specific gravity = gravity x density
B dynamicviscosity = kinematicviscosity x density
C gravity = specific gravity x density
D kinematicviscosity = dynamicviscosity x density
Correct Answer: dynamicviscosity = kinematicviscosity x density
Joule sec is the unit of_________________?
A universal gas constant
B kinematic viscosity
C thermal conductivity
D Planck’s constant
Correct Answer: Planck’s constant
The concept of overall coefficient of heat transfer is used in case of heat transfer by________________?
A conduction
B convection
C radiation
D conduction and convection
Correct Answer: conduction
In counter flow heat exchangers_________________?
A both the fluids at inlet (of heat ex¬changer where hot fluid enters) are in their coldest state
B both the fluids at inlet are in their hot¬test state
C both the fluids .at exit are in their hottest state
D one fluid is in hottest state and other in coldest state at inlet
Correct Answer: both the fluids at inlet are in their hot¬test state
Fourier’s law of heat conduction is valid for_________________?
A one dimensional cases only
B two dimensional cases only
C three dimensional cases only
D regular surfaces having non-uniform temperature gradients
Correct Answer: one dimensional cases only
LMTD in case of counter flow heat exchanger as compared-to parallel flow heat exchanger is _________________?
A higher
B lower
C same
D depends on the area of heat exchanger
Correct Answer: higher
A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?
A better insulation should be put over pipe and better one over it
B inferior insulation should be put over pipe and better one over it
C both may be put in any order
D whether to put inferior OIL over pipe or the better one would depend on steam temperature
Correct Answer: better insulation should be put over pipe and better one over it
In heat exchangers, degree of approach is defined as the difference between temperatures of________________?
A cold water inlet and outlet
B hot medium inlet and outlet
C hot medium outlet and cold water inlet
D hot medium outlet and cold water outlet
Correct Answer: hot medium outlet and cold water outlet
A non-dimensional number generally associated with natural convection heat transfer is________________?
A Grashoff number
B Nusselt number
C Weber number
D Prandtl number
Correct Answer: Grashoff number
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