‘Aco prevent breakage of blade
B:To get straight cutting
C= prevent binding when penetrating into the material
0:76 avoid wearing of blade
Correct Answer:- Option-C
Question17:-A twist drill of diameter ‘4’ mm rotates with an rpm of ‘n’. Then the cutting speed of drill in ۷۷۳(۳ is

dn
000

Bn

Cond,

மாம்‌
ಸಾ

Correct Answer:- ೦೧000,
Question18::Which one of the following is an artificial abrasive ?
‘AcAluminium oxide
B:-Emery
C-Sand stone
DCorundum
Correct Answer:- Option-é
Question19:-The process of re-conditioning the grinding wheel to make it cut better is known as
கரியது
B:-Honing
7)
பப்‌
Correct Answer:- Option-C
Question20:-Name the forging operation by which the length of workpiece is reduced and cross section area is increased
‘Ac Up setting
B:-Drawing
C=Bending
ட்ப
Correct Answer:- Option-é
Question21:-Name the property of a material by which, itcan be drawn into thin wires.
‘AcMalleabilty
B:-Hardness
c-Stifiness
D-Duetility
Correct Answer:- Option-D
Question22:-Carburising is a process of
‘A Normalising
B:-Case hardening
C-Annealing
DsTempering
Correct Answer:- Option ®
Question23:-The process of removing metal from the surface around a drilled hole to form a seat for a bolt head or nut is
‘AcCounter sinking
B:-Counter boring
CSpot facing
D-Tapping
Correct Answer:- Option-C

Question24:-The tool used to remove the taper shank drill from the machine spindle is