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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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.

Joule sec is the unit of_________________?

A universal gas constant

B kinematic viscosity

C thermal conductivity

D Planck’s constant

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

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

Review Detailed Answer

Correct Answer: Grashoff number

Emissivity of a white polished body in comparison to a black body is________________?

A higher

B lower

C same

D depends upon the shape of body

Review Detailed Answer

Correct Answer: lower

Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?

A 1 :1

B 2: 1

C 1 : 2

D 4 : 1

Review Detailed Answer

Correct Answer: 1 : 2

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Joule sec is the unit of_________________?

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

In counter flow heat exchangers_________________?

Fourier’s law of heat conduction is valid for_________________?

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

A steam pipe is to be insulated by two insulating materials put over each other . For best results__________________?

In heat exchangers, degree of approach is defined as the difference between temperatures of________________?

A non-dimensional number generally associated with natural convection heat transfer is________________?

Emissivity of a white polished body in comparison to a black body is________________?

Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?