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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

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
Cetane___________________?
A has zero cetane number
B has 100 cetane number
C helps detonation
D is a straight chain paraffin
Correct Answer: is a straight chain paraffin
Iso-oct ,ne________________?
A has octane number of 0
B has octane number of 50
C has octane number of 100
D is an index of detonation quality
Correct Answer: has octane number of 100
Kerosene is distilled at________________?
A 30 – 65°C
B 65 – 220°C
C 220 – 350°C
D 350 – 450°C
Correct Answer: 220 – 350°C
Ignition quailty of petrol is expressed by___________________?
A octane number
B cetane number
C calorific value
D self ignition temperature
Correct Answer: octane number
In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be__________________?
A less than 100°C
B between 100-250°C
C between 250 – 300°C
D between 400 – 500°C
Correct Answer: between 250 – 300°C
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