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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

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
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
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
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
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
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
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
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
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
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
Correct Answer: all of the above
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