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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

Secondary air is the used to_________________?
A provide air around burners for obtaining optimum combustion
B transport and dry the coal
C convert CO (formed in lower zone of furnace) into C02 at higher zone
D air delivered by induced draft fan
Correct Answer: provide air around burners for obtaining optimum combustion
Water and sediment in fuel oil can be removed by _______________________?
A heating the oil in the settling tanks
B cooling the oil in the settling tanks
C burning the oil
D suspension
Correct Answer: heating the oil in the settling tanks
Presence of moisture in fuel oil would____________________?
A keep the burner tips cool
B aid in proper combustion
C cause sputtering, possibly extinguish¬ing flame
D clean the nozzles
Correct Answer: cause sputtering, possibly extinguish¬ing flame
Primary air is the air used to__________________?
A provide air around burners for obtaining optimum combustion
B transport and dry the coal
C convert CO (formed in lower zone of furnace) into C02 at higher zone
D air-delivered by forced draft fan
Correct Answer: transport and dry the coal
02 content in atmospheric air on volume basis is___________________?
A 21%
B 23%
C
D 40%
Correct Answer: 21%
The economizer is used in boilers to _______________________?
A increase thermal efficiency of boiler
B economise on fuel
C extract heat from the exhaust flue gases
D increase flue gas temperature
Correct Answer: increase thermal efficiency of boiler
For combustion of a fuel, following is essential_____________________?
A correct fuel air ratio
B proper ignition temperature
C 02 to support combustion
D all the three above
Correct Answer: all the three above
Bomb calorimeter is used to determine ___________________?
A Higher calorific value at constant volume
B Lower calorific value at constant volume ,
C Higher calorific value at constant pressure
D Lower calorific value at constant pressure
Correct Answer: Higher calorific value at constant volume
Proximate analysis of fuel is determination of percentage of ____________________?
A carbon, hydrogen, nitrogen, sulphur, moisture
B fixed carbon, ash, volatile matter, moisture
C higher calorific value
D lower calorific value
Correct Answer: fixed carbon, ash, volatile matter, moisture
Reheating of steam under ideal conditions takes place at constant __________________?
A entropy
B enthaply
C pressure
D temperature
Correct Answer: temperature
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