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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

Ultimate analysis of fuel is determination of percentage of____________________?
A carbon, hydrogen, nitrogen, sulphur, moisture
B lower calorific value
C higher calorific value
D
Correct Answer: carbon, hydrogen, nitrogen, sulphur, moisture
Spontaneous combustion is a phenomenon in which____________________?
A all the fuel burns instantaneously producing high energy release
B fuel burns with less air
C coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
D explosion in furnace
Correct Answer: coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
An economiser in a boiler______________________?
A increases steam pressure
B increases steam flow
C decreases fuel consumption
D decreases steam pressure
Correct Answer: decreases fuel consumption
Sulphur content of fuels is very important to the plant operators because it____________________?
A has high heating value
B retards electric precipitation
C promotes complete combustion
D has highly corrosive effect
Correct Answer: has highly corrosive effect
Gusset stays in a boiler are provided to____________________?
A prevent the bulging of flat surfaces
B avoid explosion in furnace
C prevent leakage of hot flue gases
D support furnace freely from top
Correct Answer: prevent the bulging of flat surfaces
Pour point of fuel oil is the____________________?
A lowest temperature at which oil will flow under set condition
B storage temperature
C temperature at which fuel is pumped through burners
D temperature at which oil is transported
Correct Answer: lowest temperature at which oil will flow under set condition
The behaviour of coal in a furnace is determained by_______________________?
A the content of sulphur
B the content of ash and heating value
C the proximate analysis
D the exact analysis
Correct Answer: the proximate analysis
Green coal, in order to be burnt, must be____________________?
A heated sufficiently
B burnt in excess air
C heated to its ignition point
D burnt as powder
Correct Answer: heated to its ignition point
The proximate 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: fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
A same value
B higher value
C lower value
D lower/higher depending on steam flow
Correct Answer: higher value
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