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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 overall efficiency of thermal power plant is________________?
A boiler efficiency, turhine efficiecny, generator efficiency
B all the three above plus gas cycle efficiency
C carnot cycle efficiency
D regenerative cycle efficiency
Correct Answer: boiler efficiency, turhine efficiecny, generator efficiency
In forced circulation type boiler__________________?
A heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
B water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
C feed pump is employed to supplement natural circulation in water wall type furnace
D water is converted into steam in one pass without any recirculation
Correct Answer: water is converted into steam in one pass without any recirculation
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
A lancashire boiler
B locomotive boiler
C babcock and wilcox boiler
D cochran boiler
Correct Answer: locomotive boiler
In a recuperative air preheater, the heat is transferred____________________?
A from a metal wall from one medium to another
B from heating an itermediate material and then heating the air from this material
C by direct mixing ,
D heat is transferred by bleeding some gases from furnace
Correct Answer: from a metal wall from one medium to another
The temperature of flue gases at air heater outlet should be__________________?
A 100°C
B above dew-point temperature of flue gases
C below dew-point temperature of flue gases
D less than wet bulb temperature of flue gases
Correct Answer: above dew-point temperature of flue gases
In designing air preheater, the important design consideration is that_________________?
A approach temperature should be as low as possible
B handling and maintenance should be easier
C heat transfer area should be optimum
D stack gases should not be cooled to the dew point
Correct Answer: stack gases should not be cooled to the dew point
The function of injector used in small capacity boilers is to____________________?
A create vacuum
B inject chemical solution in feed pump
C pump water, similar to boiler feed pump
D add make up water in the system
Correct Answer: pump water, similar to boiler feed pump
The height of chimney in a power plant is governed by__________________?
A the draft to be created
B limitation of construction facilities
C control of pollution
D quantity of flue gases to be handled
Correct Answer: control of pollution
Vacuum for reciprocating steam engines compared to steam turbines is__________________?
A more
B equal
C less
D could be more or less depending on the size of plant
Correct Answer: less
In locomotives, the draught is produced by_________________?
A chimney
B induced draft fan
C both combined A. and B.
D steam jet draught
Correct Answer: steam jet draught
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