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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

Carbonation of coal is the process of________________________?
A pulverising coal in inert atmosphere
B heating wood in a limited supply of air at temperatures below 300°C
C strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D binding the pulverised coal into brick-ettes
Correct Answer: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
A less
B more
C equal
D may be less or more depending on temperature
Correct Answer: less
At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
A 373°K
B 273.16°K
C 303°K
D 0°K.
Correct Answer: 273.16°K
Which is not correct statement about effect of sulphur in fuel ___________________?
A it has heating value
B it helps in electrostatic precipitation of ash in flue-gases
C it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
D it erodes furnace walls
Correct Answer: it erodes furnace walls
Which is not the correct statement about moisture in coal ______________________?
A inherent moisture and surface mois¬ture are different things
B in some coals moisture may be present upto 40%
C some moisture in coal helps in better burning which is not possible with completely dry coal
D it increases thermal efficiency
Correct Answer: it increases thermal efficiency
Which is not correct statement about the function of furnace____________________?
A to provide proper conditions for con-tinuous complete combustion
B mix fuel with air and ignite
C separate ash from coal
D maintain heat supply to prepare and ignite the incoming fuel
Correct Answer: separate ash from coal
Which is not correct statement about pulverised fuel firing ?
A high burning rate is possible
B heat release can be easily controlled
C fuel burns economically
D it is the best technique for burning high ash content fuel having low fusion ash
Correct Answer: it is the best technique for burning high ash content fuel having low fusion ash
Pick up wrong statement about desired properties of a good fuel__________________?
A high calorific value
B produce minimum smoke and gases
C ease in storing
D high ignition point
Correct Answer: high ignition point
Thermal efficiency of a thermal power plant is of the order of___________________?
A 15%
B 20%
C 30%
D 45%
Correct Answer: 30%
The radius of a dished head is taken approximately as______________________?
A one-fourth
B half
C one
D two
Correct Answer: one
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