MECHANICAL ENGINEERING MCQ SECTION 30

291. All gases have compressibility factor of nearly unity

(A) At very high temperatures and pressures

(B) At very low pressures approaching zero

(C) Near the critical point

(D) Above the critical point

Answer: -At very low pressures approaching zero

292. Diamond tipped tools are not used for turning ferrous materials because

(A) Diamond has poor thermal conductivity

(B) Carbon has good solubility in iron

(C) Diamond has poor toughness

(D) All of above

Answer: -Diamond has poor toughness

293. The hardness testing method which does not involve resistance to plastic

deformation is

(A) Shore scleroscope

(B) Brinell

(C) Rockwell

(D) Vickers

Answer: -Shore scleroscope

294. The linear shrinkage of brass is approximately

(A) 10 mm/meter

(B) 20 mm/meter

(C) 15 mm/meter

(D) 13 mm/meter

Answer: -15 mm/meter

295. The surface at which the two halves of the sand mould meet when cope and

drag are filled together is called

(A) Middle Surface

(B) Casting surface

(C) Parting Surface

(D) None of the above

Answer: -Parting Surface

296. Which one is the strongest among the following brazing joints?

(A) Inclined

(B) Lap

(C) Butt

(D) V-butt

Answer: -Lap

297. Edge preparation for welding is not required upto a thickness of

(A) 15 mm

(B) 25 mm

(C) 30 mm

(D) 4 mm

Answer: -4 mm

298. The variation of spindle speed with diameter of workpiece at constant cutting

speed forms a series which is

(A) In geometric progression

(B) In arithmetic progression

(C) Exponential

(D) None of the above

Answer: -In geometric progression

299. The process for producing smooth surfaces by plastically moving away the

raised micro-irregularities on the surface and pressing it into the micro-cavities

is known as

(A) Buffing

(B) Burnishing

(C) Super finishing

(D) Polishing

Answer: -Burnishing

300. Micrometer measurements are more accurate than those by Vernier Caliper,

primarily because:

(A) The micrometer used flat parallel anvils

(B) Component dimension lies in the axis of measurement

(C) Micrometer does not use a linear sliding scale

(D) Micrometer uses a calibrated drum

Answer: -Micrometer does not use a linear sliding scale