Compression ratio for diesel engines is generally in the range
A.5 to 10
B.10 to 14
C.14 to 22
D.22 to 25
E.25 to 30
Category: Mechanical Engineering Mcqs
The hydrostatic law states that rate of increase of pressure in a vertical direction is equal to
A.Density of the fluid
B.Specific weight of the fluid
C.Weight of the fluid
D.None of the above
In case of a beam subjected to pure bending
A.the stress intensity in any fibre is uniform
B.the nature of stress in any fibre is identical
C.the stress intensity in any fibre is proportional to the distance of the fibre from the neutral axis
D.the stress intensity in any fibre is proportional to the distance of the fibre from the load carrying end
Piston ring are plated with chromium, cadmium or phosphate to
A.Prevent clogging
B.Improve surface finish
C.Improve heat transfer
D.Reduce wear and eliminate scuffing
E.Reduce clearance, between rings and cylinder
Devaluation is resorted to
A.Belittle foreign currencies
B.Encourage exports
C.Give more value to home currency
D.Tide over post war difficulties
E.All of the above
The assumptions generally made in the theory of pure bending is
A.The value of the Young’s modulus is the same for the beam material in tension as well as in compression
B.The elastic limit is well exceeded
C.The material of the beam is non-homogeneous
D.The transverse section of the beam suffers permanent distortion
E.The beam is rectangular in section
If a lead acid battery is fully charged at specific gravity of 1.28 and fully discharged at specific gravity of 1.11 then at specific gravity of 1.19, the battery will be
A.nearly fully charged
B.more than 50% charged
C.50% charged
D.less than 50% charged
Use of flux in melting of magnesium
A.separates out impurities
B.prevents burning of magnesium alloys
C.facilitates production of sound cstings
D.all of the above
The variable stress below which the probability of failure of a material is negligible, is called
A.Elastic limit
B.Plastic limit
C.Yield point
D.Endurance limit
E.Tolerance limit
Coulomb’s law for the force between electric charges most closely resembles
A.Newton’s laws of motion
B.Law of conservation of energy
C.Gauss’s theorem
D.Newton’s law of gravitation
E.None of the above
