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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 three “Ts” for good combustion are____________________?
A temperature, time, and turbulance
B total air, true fuel, and turbulance
C thorough mixing, total air, and temperature
D total air, time, and temperature
Correct Answer: temperature, time, and turbulance
Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
A higher effectiveness of boiler
B high calorific value coal being burnt
C fouling of heat transfer surfaces
D raising of steam temperature
Correct Answer: fouling of heat transfer surfaces
The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
A same
B more
C less
D less or more depending on size of boiler
Correct Answer: more
Boiler parameters are expressed by ___________________?
A tonnes/hr. of steam
B pressure of steam in kg/cm2
C temperature of steam in °C
D all of the above
Correct Answer: all of the above
Calorific value of coal is of the order of _______________________?
A 200-400 kcal/kg
B 800-1200 kcal/kg
C 2000-4000 kcal/kg
D 5000-8000 kcal/kg
Correct Answer: 2000-4000 kcal/kg
The condition of steam in boiler drum is always ___________________?
A dry
B wet
C saturated
D supersaturated
Correct Answer: wet
In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
A remain unaffected
B improve C. worsen
C may improve/worsen depending on size
D unpredictable
Correct Answer: may improve/worsen depending on size
Overfire burning is the phenomenon of _____________________?
A supply of excess, air
B supply of excess coal
C burning CO and unburnts in upper zone of furnace by supplying more air
D fuel bed firing
Correct Answer: burning CO and unburnts in upper zone of furnace by supplying more air
Deaeration of feed water is carried out because it reduces ____________________?
A cavitation of .boiler feed pumps
B corrosion caused by oxygen
C heat transfer coefficient
D pH value of water
Correct Answer: corrosion caused by oxygen
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: decreases
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