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.

The amount of radiation mainly depends on___________________?

A nature of body

B temperature of body

C type of surface of body

D all of the above

Review Detailed Answer

Correct Answer: all of the above

Absorptivity of a body will be equal to its emissivity___________________?

A at all temperatures

B at one particular temperature

C when system is under thermal equi-librium

D at critical temperature

Review Detailed Answer

Correct Answer: when system is under thermal equi-librium

Depending on the radiating properties, body will be transparent when________________?

A p = 0, x = 0 and a = 1

B p=l,x = 0,anda = 0

C p = 0, T= l,anda = 0

D X = 0, a + p = 1

Review Detailed Answer

Correct Answer: p = 0, T= l,anda = 0

Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

A convection

B free convection

C forced convection

D radiation

Review Detailed Answer

Correct Answer: radiation

In regenerator type heat exchanger, heat transfer takes place by___________________?

A direct mixing of hot and cold fluids

B a complete separation between hot and cold fluids

C flow of hot and cold fluids alternately over a surface

D generation of heat again and again

Review Detailed Answer

Correct Answer: flow of hot and cold fluids alternately over a surface

A perfect black body is one which_______________?

A is black in colour

B reflects all heat

C transmits all heat radiations

D abslprbs heat radiations of all wave lengths falling on it

Review Detailed Answer

Correct Answer: abslprbs heat radiations of all wave lengths falling on it

Planck’s law holds good for________________?

A black bodies

B polished bodies

C all coloured bodies

D all of the above

Review Detailed Answer

Correct Answer: black bodies

A grey body is one whose absorptivity _________________?

A varies with temperature

B varies with the wave length of incident ray

C varies with both

D does not vary with temperature and wave length of the incident ray

Review Detailed Answer

Correct Answer: does not vary with temperature and wave length of the incident ray

The thermal diffusivities for gases are generally_____________________?

A more than those for liquids

B less than those for liquids

C more than those for solids

D dependent on the viscosity

Review Detailed Answer

Correct Answer: more than those for liquids

Thermal diffusivity of a substance is __________________?

A directly proportional to thermal con¬ductivity

B inversely proportional to density of substance

C inversely proportional to specific heat

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

The amount of radiation mainly depends on___________________?

Absorptivity of a body will be equal to its emissivity___________________?

Depending on the radiating properties, body will be transparent when________________?

Two plates spaced 150 mm apart are maintained at 1000°C and 70°C. The heat transfer will take place mainly by ___________________?

In regenerator type heat exchanger, heat transfer takes place by___________________?

A perfect black body is one which_______________?

Planck’s law holds good for________________?

A grey body is one whose absorptivity _________________?

The thermal diffusivities for gases are generally_____________________?

Thermal diffusivity of a substance is __________________?