Mock paper 2 for mechanical
1) The surface and sub-surface cracks in non-magnetic alloys can be easily located and detected by the following inspection method
a)X-ray testing
b)Ultrasonic testing
c)Magnetic particle inspection testing
d)Dye penetrant testing
e)Any one of the above
2) The sprue hole is
a) A casting defect
b) A hole made for riveting
c) A blind hole in jigs
d) An eccentric hole in dies for clamping
e) An opening in mould for pouring molten metal
3) Core print are used to
a) Strengthen core
b) Form seat to support and hold the core in place
c) Fabricate core
d) None of these.
4) Blow holes are casting defects
a) Which occur due to some sand shearing from the cope surface
b) Which take the surface of internal voids or surface depression due to excessive gaseous material not able to escape
c) Which occur due to discontinuity in metal casting resulting from hindered contraction
d) Caused by two streams of metals that are too cold to fuse properly
e) None of these
5) Molten iron is desulphurized by adding the following to the ladle
a)Carbon
b)Soda ash
c)Graphite
d)Ferro-silicon
e)Ferromaganese
6) Mechanical properties of the metal improve in hot working due to
a) Recovery of grains
b) Grain growth
c) Refinement of grain size
d) Reformation of columnar grains
e) Recrystallization
7) The following type of deformation of metals takes place in cold working and hot working
a)Elastic deformation
b)Plastic deformation
c)Viscous deformation
d)Isentropic deformation
e)Visco-elastic deformation
8) The increase in hardness due to cold working is called
a) Cold hardening
b) Hot hardening
c) Work hardening
d) Age hardening
e) Induction hardening
9) Hot working operation is carried at
a) Recrystallization temperature
b) Near plastic stage temperature
c) Below recrystallization temperature
d) Above recrystallization temperature
e) Below room temperature
10) Laser is produced by
a) Graphite
b) Ruby
c) Diamond
d) Aluminium
e) Emerald
11) In the drawing operation, metals flow due to
a) Ductility
b) Work hardening
c) Plasticity
d) Shearing
e) Yielding
12) In blanking operation, the angle of shear is provided on
a) Die
b) Punch
c) Both punch and die
d) Never provided at all
e) None of these
13) Laser beam machining process is used for machining
a) Very thick materials
b) Thin materials
c) Heavy sections
d) Is not used for machining
e) There is no such limitation
14) The compound die
a) Two or more cutting operations can be performed simultaneously
b) Cutting and formation operations are combined and carried out in single operation
c) Work piece moves from one station to other with separate operation performed at each station
d) All of above
15) If N.T.L. = specification limit, then
a) Process is in control, no action required
b) P-chart can replace Xbar & R chart
c) Small steps are taken to make N.T.L. > S.L.
d) Small steps are taken for centering of the process
16) For a new product, the desirable value of process capability ratio is
a) 1
b) 1
c) <1
d) 1.5
17) Principle of quality as a loss function has been given by
a) Kaizen
b) Taguchi
c) The Bell Lab
d) Phillip Crossby
18) There are seventeen successive points taken in between UCL and LCL for a process, then for an in-control process
a) At least 12 points must be on the same side of CL
b) At most 14 points can be on the same side of CL
c) At most 13 points can be on the same side of CL
d) At least 10 points must be on the same side of CL
19) A left hand tool on lathe is used for turning in the direction
a) From right to left
b) From left to right
c) Across the bed
d) In angular position on compound slide
e) Any direction
20) The different speeds on lathe are provided in
a) Arithmetical progression
b) Harmonical progression
c) Geometrical progression
d) Any one of above
e) None of above
21) Centering can be done most accurately on
a) Four jaw chuck
b) Three jaw chuck
c) Collet chuck
d) Magnetic chuck
e) All of the above
22) Counter sinking is the operation of
a) Enlarging the end of a hole cylindrically
b) Cone shaped enlargement of the end of a hole
c) Smoothing and squaring the surface around a hole
d) Sizing and finishing a hole
e) None of above
23) Machinability can be calculated and predicted by following factors:
a)Tensile strength
b)Brittle hardness
c)Shear angle
d)All of the above
e)None of the above
24) Machinability
a) Tends to increase with increase in hardness
b) Tends to decrease with increase in hardness
c) Remains unaffected with hardness
d) (b) is correct in general, but it can be drastically influenced by strain hardening and microstructure
e) None of the above
25) The advantage of vernier caliper over micrometer is that it
a) Is easier and quicker to use
b) Is more accurate
c) Can be used to make both inside and outside measurement over a range of size
d) All of above
e) None of above
