1) A grinding wheel marked with ‘C’ is made with the abrasive
Aluminum oxide
Diamond
Corundum
Silicon carbide
2) As per Indian Standards, the grain size ‘46’ comes under the group
coarse
very fine
fine
medium
3) As per Indian Standards the ‘M’ grade of grinding wheel comes under the group
very hard
soft
hard
medium
4) The symbol conventionally used for resinoid bond is
‘E’
‘R’
‘V’
‘B’
5) A grinding wheel is marked : 51 A 46 L 5 V —23. Here what does 5 denote?
Kind of abrasive
Grain size
Structure
Kind of bond
6) Balancing of the wheel is done to
make the sides of the wheel parallel
make the outside diameter concentric with the bore
equalize the weight in every position of the wheel
none of the above
7) Grinding fluids are used to
reduce the friction between the wheel face and the job
wash away chips
prevent loading of wheel
all of the above.
8)Taps are re-sharpened by grinding ...............
relief
threads
diameter
flutes
9) The tapping hole should be .......................
equal to the core (minor) diameter of the tap
larger than the tap size
smaller than the tap size
equal to the tap size
10) A rough file is used ......................
to reduce the metal rapidly
it smooth file is not available
on irregular jobs
on wood
11) Tap water is NOT preferred as coolant white drilling. What is the reason for this?
The decrease in cutting action of the drill
Insufficient cooling effect
Quick evaporation of water
Danger of corrosion
12) A die is .................
internal thread cutting tool
square thread cutting tool
acme thread cutting tool
external thread cutting tool
13) A groove is being chipped by a chisel. How will you avoid the metal breaking off as a lump, when reaching the end of the groove?
By chipping with light force when reaching the end.
By using soluble oil.
By chipping the end portion from the opposite side.
By holding the chisel with less inclination.
14) You have to cut an aluminium block to smooth finish. Which one of the following cut of file is most suitable?
Rasp cut
Circular cut
Single cut
Double cut
15) For Cylindrical grinding a small diameter work with a fairly large wheel, which among the following grades of wheel should be used?
Medium
Hard
Soft
Very soft
16) The teeth of hacksaw blade are set to
provide clearance for the blade
prevent jamming and breakage of blade
make the kerf wider than the blade
all of the above
17) Which one the following drilling machines are used for drilling holes where electricity is not available?
Radial drilling machine
Ratchet drilling machine
Pillar drilling machine
Bench drilling machine
18) Which of the following reamers is particularly suitable for reaming holes having keyway grooves?
Pilot reamer
Taper Reamer
Helical fluted reamer
Straight fluted reamer
19) Which one of the following is NOT the cause for glazing of the wheel?
Hard wheel in place of soft wheel
Improper dressing of wheel
Feed rate is too fine
Dirty coolant
20) The effect of using a glazed or loaded wheel is
more heat generation
poor surface finish
excessive cutting pressure between the wheel face and the work surface
all the above
21) Which among the following is NOT the cause for loading of grinding wheel?
Proper grain size and grade of the wheel.
Wheel speed more than recommended
Feed too fine
Dense structure
22) Which one the following reamers can adjust itself in case of slight misalignment when fitted on a tailstock?
Adjustable reamer
Parallel reamer
Taper Reamer
Floating reamer
23) How does a hand reamer differ from a machine reamer?
Unequal spacing of cutting edges
Larger bevel lead for the cutting edges
Less number of cutting teeth
more number of cuffing teeth
24) It is commonly observed that the face of a grinding wheel becomes shiny and smooth or glazed after some use due to one of the following reasons.
Abrasive of wheel is not suitable for the purpose
Grain size is too coarse
Structure of the wheel is too open
Grade of wheel is too hard
25) What is the cause of a grinding wheel becoming glazed in a grinding machine?
Grinding wheel’s grade is too soft.
Grinding wheel’s grade is too large.
Grinding wheel’s speed is too high and work speed is low.
Feed and traverse are less.
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