81. In drilling operation, the metal is removed by
shearing
extrusion
shearing and extrusion
shearing and compressi
✅ The correct answer is option C.
Production Engineering MCQs
82. Trepanning is an operation of
making a cone-shaped enlargement of the end of a hole
smoothing and squaring the surface around a hole
sizing and finishing a small diameter hole
producing a hole by re
✅ The correct answer is option D.
83. The hole to be drilled for tapping is __________ the outside diameter of the thread on the tap.
equal to
smaller than
greater than
✅ The correct answer is option B.
84. In centreless grinding, work place centre will be
above the line joining the two wheel centres
below the line joining the two wheel centres
on the line joining the two wheel centres
at the intersection of
✅ The correct answer is option A.
85. For turning internal tapers, the suitable method is
by a form tool
by setting over the tail stock
by a taper turning attachment
by swivelling the comp
✅ The correct answer is option C.
86. Crater wear is predominant in
carbon tool steels
tungsten carbide tools
high speed steel tools
ceramic tools
✅ The correct answer is option B.
87. The surface finish is improved by the increase in
cutting speed
nose radius
true rake angle
all of these
✅ The correct answer is option D.
88. A drill mainly used in drilling brass, copper or softer materials, is
flat drill
straight fluted drill
parallel shank twist drill
tapered shank twist dr
✅ The correct answer is option B.
89. Which of the following statement is wrong as regard to down milling?
It can not be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
The coolant can be pou
✅ The correct answer is option C.
90. Down milling is also called
conventional milling
climb milling
end milling
face milling
✅ The correct answer is option B.