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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 steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: decreases
A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?
A 100 kg/cm2 and 540°C
B 1 kg/cm2 and 100°C
C 218 kg/cm2 abs and 373°C
D 218 kg/cm2 abs and 540°C
Correct Answer: 218 kg/cm2 abs and 373°C
Maximum energy loss in a boiler occurs due to _______________________?
A unburnt carbon in ash
B incomplete combustion
C ash content
D flue gases
Correct Answer: flue gases
The balanced draft furnace is one using _________________________?
A induced draft fan and chimney
B induced draft fan and forced draft fan
C forced draft fan and chimney
D any one of the above
Correct Answer: induced draft fan and forced draft fan
Evaporative capacity of boiler is expressed as____________________?
A kg of steam produced
B steam pressure produced
C kg of fuel fired
D kg of steam produced per kg of fuel fifed
Correct Answer: kg of steam produced
Pulverized fuel is used for___________________?
A better burning
B more calorific value
C less radiation loss
D medium sized units
Correct Answer: better burning
Incomplete combustion can be best judged by__________________?
A smoky chimney exit
B excess air in flue gases
C measuring carbon mono-oxide in flue gases
D measuring temperature of flue gases at exit of furnace
Correct Answer: measuring carbon mono-oxide in flue gases
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value ___________________?
A (1- moisture content)
B (1 + moisture content)
C 1 + moisture content
D 1 – moisture content
Correct Answer: (1- moisture content)
The ultimate analysis of fuel lists _____________________?
A various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
B various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
C fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
D fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Correct Answer: various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
Caking coals are those which __________________________?
A form lumps or masses of coke
B burn freely
C show little or no fusing action
D burn completely
Correct Answer: form lumps or masses of coke
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