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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

Auto-ignition temperature is____________________?
A minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B temperature at which it solidifies or congeals
C that at which it catches fire without external aid
D indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off
Correct Answer: that at which it catches fire without external aid
Petrol is distilled at a temperature in range of__________________?
A 30 – 65°C
B 65 – 220°C
C 220-350°C
D 350-450°C
Correct Answer: 65 – 220°C
Octane number is determined by comparing the performance of the petrol with the following hydrocarbons__________________?
A iso-octane
B mixture of normal heptane and iso-oc-tane
C alpha methyl napthalene
D mixture of methane and ethane
Correct Answer: mixture of normal heptane and iso-oc-tane
Ethyl fluid is used_______________________?
A to increase the octane rating of the fuel
B to increase the cetane rating of the fuel
C as a defrosting agent
D as a superior type of fluid compared to others
Correct Answer: to increase the octane rating of the fuel
Normal heptane_______________?
A accelerates auto-ignition
B helps to resist auto-ignition
C does not affect auto-ignition
D has no relation with auto-ighition
Correct Answer: helps to resist auto-ignition
Which is correct statement about reaction time for autoignition of fuel and the fuel air ratio__________________?
A lean mixture has high reaction time
B rich mixture has high reaction time
C chemically correct mixture has mini-mum reaction time
D all of the above
Correct Answer: all of the above
Ignition lag is__________________?
A the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
B time before actual fuel injection and the pump plunger starts to pump fuel
C time corresponding to actual injection and top dead center
D time corresopnding to actual ingition and top dead center
Correct Answer: the time taken by fuel after injection (before top dead center) to reach upto auto-ignition temperature
Violent sound pulsations within the cylinder of an I.C. engine are caused due to_________________?
A heavy turbulence
B improved scavenging
C heavy supercharging
D detonation
Correct Answer: detonation
Cetane number is determined by comparing the performance of diesel oil with the following hydrocarbons___________________?
A cetane
B mixture of cetane and alphamethyl napthalene
C ethylene dibromide
D mixture of aldehydes and ketones
Correct Answer: cetane
The self-ignition temperature of diesel oil compared to petrol is_________________?
A higher
B lower
C same
D depends on quality of fuel
Correct Answer: lower
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