AUTOMOBILE ENGINEERING MCQ SECTION 33

331.The most suitable theory of failure for a ductile material is

(A) The maximum normal stress theory

(B The Coulomb-Mohr's theory

(C) The maximum shear stress theory

(D) The maximum distortion energy theory

Answer: -The maximum distortion energy theory

332. For C.I. engines fuel most preferred are

(A) aromatics

(B) paraffins

(C) olefins

(D) napthenes

Answer: -paraffins

333.The endurance limit of a material can be improved by

(A) Polishing

(B) Heat treatment

(C) Knurling

(D) Introducing residual stresses

Polishing

334.In which type of teeth, variation in centre-distance within limit does not affect the velocity ratio of the mating gears.

(A) Cycloidal

(B) Involute

(C) Hypoid

(D) None of the above

Answer: -Involute

335.If both pinion and gear are made up of the same material, then the load transmission capacity is decided by

(A) The gear

(B) The pinion

(C) Both (A) and (B)

(D) None of the above

Answer: -The pinion

336.Maximum load on bolts of the connecting rod cap

(A) occurs at TDC of the suction stroke

(B) occurs at TDC of the expansion stroke

(C) occurs at BDC of the compression stroke

(D) is unpredictable.

Answer: -occurs at TDC of the suction stroke

337.A spherical pairs allows

(A) 2 degree of freedom

(B) 4 degree of freedom

(C) 1 degree of freedom

(D) 3 degree of freedom

3 degree of freedom

338. Detonation in petrol engines can be suppressed or reduced by the addition of small quantity of

(A) lead nitrate

(B) iso-octane

(C) n-heptane

(D) none of the mentioned

Answer: -lead nitrate

339.Coriolis component is considered if

(A) the point considered moves on a path that rotates

(B) the point considered moves along a path that is stationary

(C) the point considered moves along a circular path

(D) the point considered moves in any curvilinear path

Answer: -the point considered moves on a path that rotates

340.During taking a turn a cyclist inclines at an angle with the normal to the road. The equilibrium is maintained due to

(A) weight of cyclist

(B) centrifugal force alone

(C) centrifugal force and gyrocouple

(D) weight of cyclist, centrifugal force and gyrocouple.

Answer: -weight of cyclist, centrifugal force and gyrocouple.