291. High speed steel drills can be operated at about __________ the speed of high carbon steel drills.
one-half
one-fourth
double
four times
✅ The correct answer is option C.
Production Engineering MCQs
292. Low helix angle drills are preferred for drilling holes in
plastics
copper
cast steel
carbon steel
✅ The correct answer is option A.
293. The operation of smoothing and squaring the surface around a hole is known as
counter-sinking
counter-boring
trepanning
spot facing
✅ The correct answer is option D.
294. Chip breakers are used to
increase tool life
remove chips from bed
break the chips into short segments
to minimise heat gener
✅ The correct answer is option C.
295. In machining metals, surface roughness is due to
feed marks or ridges left by the cutting tool
fragment of built-up edge on the machined surface
cutting tool vibrations
all of these
✅ The correct answer is option D.
296. A 15 mm drilling machine means that it can drill a hole
of maximum diameter 15 mm
in 15 mm thick plates
having cross-sectional area of 15 mm2
none of these
✅ The correct answer is option A.
297. The thrust force will increase with the increase in
side cutting edge angle
tool nose radius
rake angle
end cutting edge angle
✅ The correct answer is option A.
298. The plain milling machine is more rigid and heavier in construction than a universal milling machine of the same size.
Correct
Incorrect
✅ The correct answer is option A.
299. Which of the following operation is first performed?
Spot facing
Boring
Tapping
Drilling
✅ The correct answer is option D.
300. An operation of enlarging the end of a hole cylindrically is known as grooving.
Correct
Incorrect
✅ The correct answer is option B.