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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

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
The overall efficiency of thermal power plant is________________?
A boiler efficiency, turhine efficiecny, generator efficiency
B all the three above plus gas cycle efficiency
C carnot cycle efficiency
D regenerative cycle efficiency
Correct Answer: boiler efficiency, turhine efficiecny, generator efficiency
In forced circulation type boiler__________________?
A heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C feed pump is employed to supplement natural circulation in water wall type furnace
D water is converted into steam in one pass without any recirculation
Correct Answer: water is converted into steam in one pass without any recirculation
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