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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 evaporation of 15.653 kg of water per hour from and at 100°C is called_________________?
A evaporative capacity
B factor of evaporation
C equivalent evaporation
D one boiler h.p.
Correct Answer: one boiler h.p.
During polytropic process_________________?
A heat transfer takes place across cylinder walls
B work is done
C steam may be wet, dry or superheated after expansion
D all of the above
Correct Answer: all of the above
Cochran boiler is a__________________?
A horizontal fire-tube boiler
B horizontal water-tube boiler
C veritcal water-tube boiler
D vertical fire tube boiler
Correct Answer: vertical fire tube boiler
Orsat meter is used for__________________?
A gravimetric analysis of the flue gases
B volumetric analysis of the flue gases
C mass flow of the flue gases
D measuring smoke density of flue gases
Correct Answer: volumetric analysis of the flue gases
An ideal regenerative cycle is ______________________?
A equal to carnot cycle
B less than carnot cycle
C more than carnot cycle
D could be anything
Correct Answer: less than carnot cycle
Lancashire ‘boiler is a__________________?
A stationary fire tube boiler
B stationary water tube boiler
C water tube boiler with natural/forced circulation
D mobile fire tube boiler
Correct Answer: stationary fire tube boiler
One kilowatt-hour energy is equivalent to ________________?
A 1000 J
B 360 kJ
C 3600 kJ
D 3600 kW/sec
Correct Answer: 3600 kJ
100% efficiency of a thermal cycle cannot be achieved because of __________________?
A frictional losses
B it is not possible to achieve 0°K temperature
C leakage
D non-availability of ideal substance
Correct Answer: it is not possible to achieve 0°K temperature
The diameter of fire tube of Cornish boiler compared to its shell is__________________?
A one half
B one third
C one-fifth
D two-fifth
Correct Answer: one half
The change in internal energy in steam engines equals to__________________?
A work done during the rankine cycle ;
B work done during compression.
C work done during adiabatic expansion
D change in enthalpy
Correct Answer: work done during the rankine cycle ;
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