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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

Gaseous-fuel guarantees are based on___________________?
A calorific value of oil
B low heat value of oil
C high heat value of oil
D mean heat value of oil
Correct Answer: low heat value of oil
A 75 cc engine has following parameter as 75 cc ___________________?
A fuel tank capacity
B lub oil capacity
C swept volume
D cylinder volume
Correct Answer: swept volume
Diesel fuel, compared to petrol is_________________?
A less difficult to ignite
B just about the same difficult to ignite
C more difficult to ignite
D highly ignitable
Correct Answer: more difficult to ignite
The air-fuel ratio of the petrol engine is controlled by__________________?
A fuel pump
B governor
C injector
D carburettor
Correct Answer: carburettor
The accunmulation of carbon in a cylinder results in increase of________________?
A clearance volume
B volumetric efficiency
C ignition time
D effective compression ratio
Correct Answer: effective compression ratio
In a typical medium speed 4-stroke cycle diesel engine________________?
A compression starts at 35° after bottom dead center and ends at top dead center
B compression starts at bottom dead center and ends at top dead center
C compression starts at 10° before bottom dead center and, ends just before top dead center
D may start and end anywhere
Correct Answer: compression starts at 35° after bottom dead center and ends at top dead center
The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?
A more
B loss
C same
D may be more or less depending on engine capacity
Correct Answer: loss
The specific fuel consumption per BHP hour for diesel engine is approximately___________________?
A 0.15 kg
B 0.2 kg
C 0.25 kg
D 0.3 kg
Correct Answer: 0.2 kg
The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?
A 80°C
B 120°C
C 180°C
D 240°C
Correct Answer: 80°C
Combustion in compression ignition engines is____________________?
A homogeneous
B heterogeneous
C both A. and B.
D laminar
Correct Answer: heterogeneous
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