- In a cutting operation, the largest force is
- When radial force in cutting operation is too large, it will cause
- The cutting force is affected by
- Titanium carbide coated tools
- Tolerances on commonly used twist drill diameters are held quite close, averaging
- Drill diameter is measured over the
- Point angle of 90° on drills is used for
- An oversize hole will be produced in drilling, if
- The most widely used material for drills, taps and reamers is
- Choose the correct statement A twist drill produces a hole of
- The most suitable machine for drilling holes in rifle barrels is
- Time taken to drill a hole through a 25 mm thickplate at 300 r.p.mat a feed rate of 0.25 mm/revolution will be
- A twist drill is specified by
- The metal is removed in drilling operation by
- The optimum lip angle of the twist drill for the work material of mild steel should be
- A twist drill is specified by its shank, material and
- The best way to check the sharpness of a drill of tungsten carbide-tipped bit is to
- Quill in connection with drilling machine refers to
- 4The helix angle on a HSS twist drill for drilling cast iron is of the order of
- Twist fluted drills are preferred because
- A portable drilling machine is specified by
- The important purpose of flutes in a drill is that they enable the
- The usual value of helix angle of a drill is
- The point angles and clearance angles of drills depend on
- The rake angle of a single point cutting tool corresponds to following angle of a twist drill
- A twist drill is specified by
- All straight-shanked drills used in drill press work must be held in the
- Point angle of 118° on drills is used for
- Cutting fluid in drilling operation is used to
- The work is usually rotated while the drill is fords int the work in
(a) axial or longitudinal force
(b) tangential force
(c) radial force
(d) along shear plane
(e) (a) and (b) above.
tangential force
(a) best finish
(b) chatter and poor finish
(c) finish has nothing to do with radial force
(d) shorten tool life
(e) all of the above.
chatter and poor finish
(a) feed, speed and depth of cut
(b) cutting tool angle
(c) material hardness
(d) type of lubricant
(e) (a) and (c) above.
(a) and (c) above.
(a) require frequent regrindings
(b) require a few regrindings
(c) require regrinding according to equipment
(d) require no regrinding
(e) none of the above.
require regrinding according to equipment
(a) +0.02 mm- 0.02 mm
(b) +0, -0.02 mm
(c) 0.0 mm, – 0 mm
(d) +0.002 m, – 0.002 mm
(e) +0, -0.2 mm.
+0, -0.02 mm
(a) main body
(b) plain shank portion
(c) margins at the drill point
(d) heel
(e) lips.
margins at the drill point
(a) all general applications on mild steel
(b) bakelite, hard rubber and fibrous plastics
(c) hard steels and nickel alloys
(d) thin sheet metal
(e) there is no such criterion.
bakelite, hard rubber and fibrous plastics
(a) feed rate is very high
(b) cutting speed is too low
(c) lips of drill are of unequal length
(d) unsufficient coolant is used
(e) drill is not properly fixed.
unsufficient coolant is used
(a) low alloy carbon steel
(b) high speed steel
(c) carbon steel
(d) cemented carbide
(e) ceramic.
low alloy carbon steel
(a) fine finish
(b) accurate size
(c) exactly round
(d) exactly positioned
(e) none of the above.
none of the above.
(a) ultrasonic machining
(b) laser machining
(c) radial drilling machine
(d) deep hole drilling machine
(e) plasma arc drilling.
deep hole drilling machine
(a) 10 sec
(b) 20 sec
(c) 25 sec
(d) 40 sec
(e) 50 sec.
20 sec
(a) an alphabet specifying hole size
(b) A number specifying hole size
(c) the size of hole it can drill
(d) any one of the above
(e) none of the above.
any one of the above
(a) work hardening of metal
(b) compression
(c) shearing
(d) extrusion
(e) shearing and extrusion.
shearing and extrusion.
(a) 110
(b) 108°
(c) 118°
(d) 120°
(e) 181°
118°
(a) diameter
(b) lip angle
(c) length of body
(d) size of flute
(e) all of the above.
diameter
(a) inspect it physically
(b) test hardness
(c) drill a test hole
(d) judge its finish
(e) rub it against a known surface.
drill a test hole
(a) drill holding mechanism
(b) keyway
(c) rack
(d) none of the above.
(e) pinion
keyway
(a) 14- 22°
(b) 24 32
(c) 35 -40°
(d) 40- 45
(e) 45- 55°
24 32
(a) it cuts holes efficiently
(b) it is a light weight tool
(c) cutting lip is supported rigidly
(d) it moves swiftly in the metal
(e) chips move out automatically.
chips move out automatically.
(a) the size of the job it can hold
(b) maximum diameter of drill it can hold
(c) spindle speeds and feeds
(d) maximum spindle travel
(e) size of the table.
maximum diameter of drill it can hold
(a) cutting fluid to enter the working zone
(b) chips to come out
(c) strength of the drill at the cutting point
(d) weight of the drill to be reduced
(e) cutting edges to be formed.
cutting edges to be formed.
(a) 10
(b) 20°
(c) 30°
(d) 60°
(e) 118
30°
(a) drill diameter
(b) material to be drilled
(c) r.p.mof the drill
(d) depth of the hole to be drilled
(e) type of lubricant used.
material to be drilled
(a) point angle
(b) helix angle
(c) lip diameter angle
(d) chisel edge angle
(e) primary angle.
helix angle
(a) its diameter and lip angle
(b) its material and shank
(c) it shank and diameter
(d) shank, material and flute size
(e) shank, material and diameter.
shank, material and diameter.
(a) spindle of the drill press
(b) key type drill chuck
(c) tapers sleeve
(d) vise
(e) universal head.
key type drill chuck
(a) all general applications on mild steel
(b) bakelite, hard rubber and fibrous plastics
(c) hard steel and nickel alloys
(d) thin steel metal
(e) there is no such criterion.
all general applications on mild steel
(a) cool the work
(b) cool the drill
(c) aid in rapid removal of chips
(d) improve the finish of the drilled hole
(e) all of the above.
all of the above.
(a) hand drilling machine
(b) radial drilling machine
(c) deep hole drilling machine
(d) multiple spindle drilling machine
(e) none of the above.
deep hole drilling machine
Cover Topic
“lubricants examples”,”types of lubricants pdf”
