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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 inlet value of a four stroke cycle I.C engine remains open for nearly___________________?
A 180°
B 125°
C 235°
D 200°
Correct Answer: 235°
The specific fuel consumption per BH hour for a petrol engine is approximately__________________?
A 0.15 kg
B 0.2 kg
C 0.25 kg
D 0.3kg
Correct Answer: 0.25 kg
Crankcase explosion in I.C. engines usuall occurs as ___________________?
A first a mild explosion followed by a bi explosion
B first a big explosion followed by a mil explosion
C both mild and big explosions occi simultaneously
D never occurs
Correct Answer: first a mild explosion followed by a bi explosion
The maximum temperature in the I.C. engine cylinder is of the order of ________________?
A 500- 1000°C
B 1000- 1500°C
C 1500-2000°C
D 2000-2500°C
Correct Answer: 2000-2500°C
The fuel in diesel engine is normally injected at pressure of_________________?
A 5-10 kg/cm2
B 20-25 kg/cm2
C 60-80 kg/cm2
D 90-130 kg/cm2
Correct Answer: 90-130 kg/cm2
The pressure and temperature at the end of compression stroke in a petrol engine are of the order of___________________?
A 4 – 6 kg/cm2 and 200 – 250°C
B 6 – 12 kg/cm2 and 250 – 350°C
C 12 – 20 kg/cm2 and 350 – 450°C
D 20 – 30 kg/cm2 and 450 – 500°C
Correct Answer: 6 – 12 kg/cm2 and 250 – 350°C
In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?
A high heat value
B low heat value
C net calorific value
D middle heat value
Correct Answer: low heat value
Fuel oil consumption guarantees for I .C. engine are usually based on__________________?
A low heat value of oil
B high heat value of oil
C net calorific value of oil
D calorific value of fuel
Correct Answer: high heat value of oil
All heat engines utilize_____________________?
A low heat value of oil
B high heat value of oil
C net claorific value of oil
D calorific value of fuel
Correct Answer: low heat value of oil
The calorific value of gaseous fuels is expressed in terms of__________________?
A kcal
B kcal/kg
C kcal/m2
D kcal/m²
Correct Answer: kcal

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