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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

Detonation is caused by the following unstable compounds______________________?
A peroxides, aldehydes and ketones
B peroxides, aldehydes, oxides and sul-phides
C aldehydes, oxides and ketones
D ketones and sulphur compounds
Correct Answer: peroxides, aldehydes and ketones
The function of a fuel pump in a petrol pump is to______________________?
A inject fuel in cylinder
B supply fuel when carburettor fails
C pump fuel so that it reaches carburettor (to improve thermal efficiency)
D does not exist
Correct Answer: pump fuel so that it reaches carburettor (to improve thermal efficiency)
The thermal efficiency of a petrol engine of two stroke with crank case scavenging as compared to four stroke petrol engine with same comperssion ratio will be_____________________?
A higher
B lower
C same
D depends on size of engine
Correct Answer: lower
The spark plug gap is normally maintained at________________?
A 0.1 to 0.2 mm
B 0.2 to 0.4 mm
C 0.45 to 0.6 mm
D 0.6 to 0.8 mm
Correct Answer: 0.45 to 0.6 mm
The delay period in petrol engine is of the order of__________________?
A 0.001 sec
B 0.002 see
C 0.01 sec
D 0.05 sec
Correct Answer: 0.002 see
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
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