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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

In the case of compression ignition engine, the %age of CO in exhaust gases is________________?
A Zero
B 5-10%
C Depends on load
D Considerable percent
Correct Answer: Zero
The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?
A increase
B decrease
C remain unaffected
D increase/decrease depending upon engine capacity
Correct Answer: increase
In precombustion chamber in diesel engine________________?
A The shape and layout of the pistion crown, the inlet port, and the valve produce the turbulent effect of fuel mixture
B Fuel is injected into an auxiliary chamber that is separated from the cylinder by an orifice or throat
C Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
D There are no valves
Correct Answer: Only a part of air charge is contained in an auxiliary chamber in which the fuel starts to burn with insufficient air which due to explosion tendency mixes thoroughly into main cylinder charge
In a diesel engine, injection pressure developed by injector is of the order of______________?
A 10 kg/cm2
B 100 kg/cm2
C 500 kg/cm2
D 1400 kg/cm2
Correct Answer: 1400 kg/cm2
In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________?
A Zero
B 5-10%
C Depends on load and quality of fuel
D Considerable percent
Correct Answer: Considerable percent
All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________?
A Half
B One
C Two
D Four
Correct Answer: One
As the number of cylinders in multi-cylinder engine increases, the power to weight ratio_______________?
A Decreases
B Increases
C Remains same
D Decreases upto a limit and then increases
Correct Answer: Decreases
The termal efficiency of a petrol engine at design load is around_________________?
A 90%
B 50%
C 40%
D 30%
Correct Answer: 30%
Method of governing used in petrol engine is________________?
A quantity governing
B quality governing
C combined governing
D partial governing
Correct Answer: quantity governing
Method of governing used in diesel engine is__________________?
A quantity governing
B quality governing
C combined governing
D partial governing
Correct Answer: quality governing

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