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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 transfer takes place as per ________________?

A zeroth law of thermodynamics

B first law of thermodynamic

C second law of the thermodynamics

D Kirchoff’s law E. Stefan’s law

Review Detailed Answer

Correct Answer: second law of the thermodynamics

According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?

A absolute temperature (T)

B I2

C f

D t

Review Detailed Answer

Correct Answer: absolute temperature (T)

Depending on the radiating properties, a body will be opaque when _________________?

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

B p=l,x = 0anda = 0

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

D x – 0, a + p = 1

Review Detailed Answer

Correct Answer: x – 0, a + p = 1

Depending on the radiating properties, a body will be white when_________________?

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

B p=l,T = 0anda = 0

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

D x = 0, a + p = 1

Review Detailed Answer

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

The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?

A Krichoff’s law

B Stefan’s law

C Wien’ law

D Planck’s law

Review Detailed Answer

Correct Answer: Krichoff’s law

The thermal diffusivities for solids are generally__________________?

A less than those for gases

B jess than those for liquids

C more than those for liquids and gases

D more or less same as for liquids and gases

Review Detailed Answer

Correct Answer: more than those for liquids and gases

According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

A absolute temperature

B T2

C T5

D t

Review Detailed Answer

Correct Answer: t

Depending on the radiating properties, a body will be black when_________________?

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

B p= l,T = 0anda = 0

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

D x = 0, a + p = 0

Review Detailed Answer

Correct Answer: p = 0, x = 0 and a = 1

The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?

A temperature

B thickness

C area

D time

Review Detailed Answer

Correct Answer: time

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?

A 0.45

B 0.55

C 0.40

D 0.75

Review Detailed Answer

Correct Answer: 0.45

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Heat transfer takes place as per ________________?

According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________________?

Depending on the radiating properties, a body will be opaque when _________________?

Depending on the radiating properties, a body will be white when_________________?

The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as_________________?

The thermal diffusivities for solids are generally__________________?

According to Stefan’s law, the total radiation from a black body per second per unit area is proportional to____________________?

Depending on the radiating properties, a body will be black when_________________?

The total emissivity power is .defined as the total amount of radiation emitted by a black body per unit_______________?

40% of incident radiant energy on the surface of a thermally transparent body is reflected back. If the transmissivity of the body be 0.15, then the emissivity of surface is____________________?