০০। A 15 mm drilling machine means that it can drill a hole
ক) ofmaximumdiameter 15 mm
খ) in 15 mm thick plates
গ) having cross-sectional area of 15 mm2
ঘ) none of these
০১। A better machinable metal is one which gives
ক) lower chip-tool contact area and larger shear angle
খ) higher chip-tool contact area and smaller shear angle
গ) lower chip-tool contact area and smaller shear angle
ঘ) higher chip-tool contact area and larger shear angle
০২। A bottoming tap has
ক) its end tapered for about three or four threads
খ) its end tapered for about eight or ten threads
গ) full threads for the whole of its length
ঘ) none of the above
০৩। A broach has
ক) roughing teeth
খ) semi-finishing teeth
গ) finishing teeth
ঘ) all of these
০৪। A coarse grained grinding wheel is used to grind
ক) hard and brittle materials
খ) soft and ductile materials
গ) hard and ductile materials
ঘ) soft and brittle materials
০৫। A dense structure of a grinding wheel is denoted by the number 9 to 15 or higher.
ক) Yes
খ) No
০৬। A dense structure of a grinding wheel is used for
ক) hard materials
খ) brittle materials
গ) fnishing cuts
ঘ) all of these
০৭। A diamond locating pin is used in jigs and fixtures because
ক) diamond is very hard and wear resistant
খ) it occupies very little space
গ) it helps in assembly with tolerance on centre distance
ঘ) it has a long life
০৮। A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through-hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is
ক) 0.2 mm
খ) 10 mm
গ) 20 mm
ঘ) 100 mm
০৯। A drill considered as a cutting tool having zero rake, is known as a
ক) flat drill
খ) straight fluted drill
গ) parallel shank twist drill
ঘ) tapered shank twist drill
১০। A drill mainly used in drilling brass, copper or softer materials, is
ক) flat drill
খ) straight fluted drill
গ) parallel shank twist drill
ঘ) tapered shank twist drill
১১। A dynamometer is a device used for the measurement of
ক) chip thickness ratio
খ) forces during metal cutting
গ) wear of the cutting tool
ঘ) deflection of the cutting tool
১২। A feed gear box for a screw cutting lathe is designed on the basis of
ক) geometric progression
খ) arithmetic progression
গ) harmonic progression
ঘ) none of these
১৩। A fine grained grinding wheel is used to grind
ক) hard and brittle materials
খ) soft and ductile materials
গ) hard and ductile materials
ঘ) soft and brittle materials
১৪। A fine grained grinding wheel is used to grind hard materials.
ক) Correct
খ) Incorrect
১৫। A fixture does not guide the tool.
ক) Correct
খ) Incorrect
১৬। A fixture is defined as a device which
ক) holds and locates a workpiece and guides and controls one or more cutting tools
খ) holds and locates a workpiece during an inspection or for a manufacturing operation
গ) is used to check the accuracy of workpiece
ঘ) all of the above
১৭। A grinding wheel becomes glazed (i.e. cutting edge takes a glass-like appearance) due to
ক) wear of bond
খ) breaking of abrasive grains
গ) wear of abrasive grains
ঘ) cracks on grinding wheel
১৮। A grinding wheel is said to be of __________ if it holds the abrasive grains more securely.
ক) soft grade
খ) medium grade
গ) hard grade
১৯। A grinding wheel is said to be of __________ if the abrasive grains can be easily dislodged.