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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.

Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?

A thermal resistance

B thermal coefficient

C temperature gradient

D thermal conductivity

Review Detailed Answer

Correct Answer: thermal conductivity

A grey body is one whose absorptivity_________________?

A varies with temperature

B varies with wavelength of the incident ray

C is equal to its emissivity

D does not vary with temperature and. wavelength of the incident ray

Review Detailed Answer

Correct Answer: is equal to its emissivity

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

A emissivity

B transmissivity

C reflectivity

D intensity of radiation

Review Detailed Answer

Correct Answer: intensity of radiation

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

A convection

B radiation

C conduction

D both convection and conduction

Review Detailed Answer

Correct Answer: conduction

Unit of thermal diffusivity is_________________?

A m2/hr

B m2/hr°C

C kcal/m2 hr

D kcal/m.hr°C

Review Detailed Answer

Correct Answer: m2/hr

Film coefficient is defined as Inside diameter of tube________________?

A Equivalent thickness of film

B Thermal conductivity Equivalent thickness of film Specific heat x Viscocity

C Thermal conductivity Molecular diffusivity of momentum Thermal diffusivity

D Film coefficient x Inside diameter Thermalconductivity

Review Detailed Answer

Correct Answer: Equivalent thickness of film

Thermal conductivity of wood depends on_______________?

A moisture

B density

C temperature

D all of the above

Review Detailed Answer

Correct Answer: all of the above

Thermal diffusivity is ____________________?

A a dimensionless parameter

B function of temperature

C used as mathematical model

D a physical property of the material

Review Detailed Answer

Correct Answer: a physical property of the material

Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

A high thickness of insulation

B high vapour pressure

C less thermal conductivity insulator

D a vapour seal

Review Detailed Answer

Correct Answer: a vapour seal

Heat transfer by radiation mainly depends upon___________________?

A its temperature

B nature of the body

C kind and extent of its surface

D all of the above

Review Detailed Answer

Correct Answer: all of the above

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Heat conducted througfi unit area and unit thick face per unit time when temperature difference between opposite faces is unity,is called__________________?

A grey body is one whose absorptivity_________________?

The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as ________________?

In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by___________________?

Unit of thermal diffusivity is_________________?

Film coefficient is defined as Inside diameter of tube________________?

Thermal conductivity of wood depends on_______________?

Thermal diffusivity is ____________________?

Moisture would find its way into insulation by vapour pressure unless it is prevented by __________________ ?

Heat transfer by radiation mainly depends upon___________________?