AUTOMOBILE ENGINEERING MCQ SECTION 32

311.A taper provided on the pattern for its easy and clean withdrawal from the mould is known as

(A) Machining Allowance

(B) Draft Allowance

(C) Shrinkage Allowance

(D) Distortion Allowance

Answer: -Draft Allowance

312. Olefins are generally represented by

(A) C_nH_n

(B) C_nH_2n

(C) C_nH_2n+2

(D) CnH2n-6

Answer: -C_nH_n

313.A cone with an apex angle 2q is cut by a cutting plane at an angle a. When a is greater than q, the intersection curves is

(A) Ellipse

(B) Parabola

(C) Hyperbola

(D) Circle

Answer: -Ellipse

314.A cone with an apex angle 2q is cut by a cutting plane at an angle a. When the a is less than q, the intersection curves is

(A) Ellipse

(B) Parabola

(C) Hyperbola

(D) Circle

Answer: -Hyperbola

315.What is the preferable inclination of hatching lines?

(A) 30°

(B) 60°

(C) 75°

(D) 45°

Answer: -45°

316.Half-sections are best used when the object is

(A) Irregular

(B) Visualized

(C) Nonvisualized

(D) Symmetrical

Answer: -Symmetrical

317.The free energy decrease during recrystallization comes mainly from

(A) excess point defects

(B) excess dislocations

(C) grain boundaries

(D) lower energy of the new crystal structure

Answer: -excess dislocations

318. Hydrocarbons are decomposed into smaller hydrocarbons by

(A) reforming

(B) refining

(C) cracking

(D) polymerization

Answer: -cracking

319.On heating a rubber under tensile force, it

(A) Shrinks

(B) Expands

(C) Expands rapidly

(D) Show no change

Answer: -Shrinks

320.Crystals like diamond and silicon are brittle, because

(A) they contain no dislocations

(B) they are noncrystalline

(C) the stress to move a dislocation is high in them

(D) they contain very few dislocations

Answer: -the stress to move a dislocation is high in them