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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

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
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
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
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
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
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
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
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
Correct Answer: 0.45
The emissive power of a body depends upon its___________________?
A temperature
B wave length
C physical nature
D all of the above
Correct Answer: all of the above
The ratio of the energy absorbed by the body to total energy falling on it is called_________________?
A absorptive power
B emissive power
C absorptivity
D emissivity
Correct Answer: absorptive power
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