PARISUTHAM INSTITUTE OF TECHNOLOGY & SCIENCE
THANJAVUR-613006
DEPARTMENT OF MECHANICAL ENGINEERING
ME-1254 MANUFACTURING TECHNOLOGY-I
VIVA VOCE-I
1) In orthogonal cutting of metals
a) the cutting edge of the tool is perpendicular to
c) a and b
the direction of tool travel
d) a only
b) the cutting forces occur in two directions
only
2) Discontinuous chips are formed during machining of
a) brittle metals
b) ductile metals
c) hard metals
d) soft metals
3) The ductile materials during machining procedure
a) continuous chips
c) continuous chips with built up edge
b) discontinuous chips
d) either a or c
4) Which of the following parameters govern the value of shear angle in continuous chip
formation
a) true feed
c) rake angle of the cutting tool
b) chip thickness
d) all of these
5) If the cutting speed is increased then the built up edge
a) becomes longer
b) may or may not form
c) becomes smaller and finally does not form at all
d) has nothing to do with speed
6) The rake angle required to machine brass by high speed steel tool is(in degrees)
a) 0
c) 20
b) 10
d) -10
7) A single point thread cutting tool should ideally have
a) zero rake angle
c) negative rake angle
b) positive rake angle
d) point angle
8) Which of the following statement is correct about nose radius
a) it improves tool life
c) a and b
b) it improves the surface finish
d) none of these
9) In ASA system if the tool nomenclature is 8-6-5-5-10-15-2 mm then the side rake angle
will be (in degrees)
a) 5
c) 8
b) 6
d) 10
10) Relief angle on high speed steel tools usually vary from (in degress)
a) 0-3
c) 10-20
b 3-10
d) 20-30
11) cemented carbide tools are generally poor in shear
a)yes
b)no
12) Back rake angle of a single point cutting tool is the angle by which the face of the tool is
inclined towards back
a) agree
b) disagree
13) The part of the tool on which cutting edge is formed is called nose
a) right
b) wrong
14) The negative rake angle is usually provide on
a) high carbon steel tools
c) cemented carbide tools
b) high speed steel tools
d)all of these
15) The angle between shear plane and____________ is called shear angle
a) work surface
c) a and b
b) tool face
d) none of these above
16) side rake angle on tool is provided to control chip flow
a) true
b) false
17) If the shear angle is large and the chip tool contact is low, then the tool life will be more
a) true
b) false
18) Negative rakes are used for
a) carbide tools
c) harder materials
b) heavy loads
d) all of these
19) The parameter which completely defines the chip formation in a metal cutting process
a) shear angle
c) a and b
b) chip tool contact length
d) none of these
20) An important geometrical quantity in the cutting of metals which can be used as a
criterion for machinability of metal is
a) cutting speed
c) shear angle
b) feed rate
d) tool geometry
21) In machining cast iron no cutting fluid is required
a)right
b)wrong
22) The cutting fluid mostly used for machining alloy steel is
a) water
c) dry
b) soluble oil
d) sulphurised mineral oil
23) A numerical method of identification of tool is known as
a) tool dimension
c) a and b
b) tool signature
d) none of these
24) Tool signature consist of --------------- elements
a) 2
c) 5
b) 4
d) 7
25) Chip breakers are used
a) increase tool life
c) break the chips in to short segment
b) remove chip from bed
d) to minimise the heat generation
26) Broaching is applied for machining
a) internal and external surfaces
c) external flat and contoured surfaces
b) round and irregular shaped holes
d) all of these
27) Gear lapping is an operation
a) after heat treatment
c)gear reconditioning
b) prior to heat treatment
d) none of these
28) In gear hobbing
a) only hob rotates
c) a and b
b) only gear blank rotates
b) neither a nor b
29) Gear burnishing is a process of for
a)surface finishing
b) under cut gears
c) cycloidal gears
d) Removing residual stresses from teeth
roots
30) Internal gears can be made by
a) hobbing
c) shapping with rack cutter
b) shapping with pinion cutter
d) milling
31) Gears can be produced on mass poduction by
a) shaping
c) forming
b) casting
d) hobbing
32) Gear finishing operation is called
a) shapping
c)hobbing
b) milling
d) burnishing
33) Down milling is also called
a) conventional milling
c) end milling
b) climb milling
d) face milling
34) Drilling is an example an example of
a) orthogonal cutting
c)simple cutting
b) oblique cutting
d) uniform cutting
35) In drilling operation the metal is removed by
a) shearing
c) a and b
b) extrusion
d) shearing and extrusion
36) The chamfering is an essential operation after
a) knurling
c) boring
b) rough turning
d) thread cutting
37) The lead screw of a lathe has --------------------- threads
a) single start
c) multi start
b) double start
d) any one of these
38) The cutting speed is maximum while machining--------------------------- with a high speed
steel tool
a) cast iron
d)aluminium
b) mild steel
c) brass
39) Hard and tough materials like cast iron should be turned at
a) slow speed
c) any speed
b) high speed
d) certain specific speed
40)Lathe bed is made of
a) mild steel
c) pig iron
b) alloy steel
d) chilled cast iron
41) Slow speed of the spindle is necessary in
a) thread cutting
c) turning a hard or tough material
b) turning a work of larger diameter
d) all of these
42) As the cutting speed increase the tool cutting forces
a) remain constant
c)decreases
b)increase
d)first increases and then decreases
43) Ceramic cutting tools are
a) made by cold pressing of aluminium
oxide powder
c) brittle and have low bending strength
d) all of these
b) available in the form of tips
44) Cutting fluids are used to
a) cool the tool
c) cool the work piece
b) improve surface finish
d) all of these
45) The tool material for faster machining should have
a) wear resistance
c) toughness
b) red hardness
d) all of these
46) In machining metals , chips break due to----------------------- work material
a) toughness
c) Elasticity
b) ductility
d) work hardening
47) In machining metal cutting force at the cutting edge is measured by a
a) wattmeter
c) hydrometer
b)Dynamometer
d) pyrometer
48) For machining a mild steel work piece using carbide tool the maximum material will be
removed at a temperature ------ ( degree celcius)
a) 50
c) 175
b 100
d) 275
49) For machining a mild steel work piece by a high speed steel tool, the average cutting speed
is -------( m/min)
a)10
c)22
b)15
d)30
50) For machining a cast iron work piece by a high speed steel tool, the average cutting speed
is -------( m/min)
a)10
b)15
c)22
d)30
Answer
1)c 2)a 3)d 4)d 5)c 6)a 7)a 8)c 9)b
10)d 11)a 12)a 13)b 14)c 15)a 16)a
17)a 18)d 19)c 20)c 21)a 22)d 23)a
24)d 25)c 26)d 27)a 28)c 29)a 30)b
31)d 32)d 33)b 34)b 35)c 36)d 37)a
38)d 39)a 40)d 41)d 42)c 43)d 44)d
45)d 46)d 47)b 48)b 49)d 50)c