Deck 2: Mechanical Engineering and Manufacturing Processes

Question 1

Which of the following is an inert gas?

A)Carbondioxide
B)Carbon monoxide
C)Nitrogen
D)Argon
E)All of the above

Answer 1

Argon

Question 2

In lathe machine the chasing dial is used during

A)Taper turning
B)Drilling
C)Parting off
D)Thread cutting
E)Knurling

Answer 2

Thread cutting

Question 3

The depth of cut depends on the

A)curring speed
B)rigidity of machine tool
C)tool material
D)all of the above
E)Parting off

Answer 3

all of the above

Question 4

Which of the following is a gear finishing operation?

A)Gear burnishing
B)Phosphate coating
C)Gear lapping
D)All of the above
E)Parting off

Question 5

While cutting with a hacksaw, the number of teeth contacting the job should be

A)More than one
B)Only one
C)Any of (A) or (B)
D)Parting off

Question 6

Which one of the following is not included in the combinations set?

A)A centre head
B)A protector
C)Square
D)A rule
E)Short rule

Question 7

Choose the incorrect statement. The mechanism of tool wear is

A)oxidation
B)reduction
C)diffusion
D)None of the above
E)Parting off

Question 8

Discontinuous type chips are generally produced in

A)Alloy steels
B)Cast iron
C)Aluminium
D)Duralumin
E)Mild steel

Question 9

Yellow colour on a pattern indicates

A)Seat for loose core prints
B)Surface to be left unmachined
C)Surface to be machined
D)Fillets
E)Core prints

Question 10

Taper shank on drills is provided for

A)Use on tapered surfaces
B)Eye
C)Quick intersection in spindle
D)None of these
E)Drilling taper holes

Question 11

Coated tools are good at

A)reducing machining cost
B)increasing surface finish on scoled surfaces
C)reducing diffusion wear
D)None of the above
E)Carmetting

Question 12

Noise level in case of an aircraft is

A)In the range of 80 - 110 db
B)Always more than 100 db
C)Generally less than 100 db
D)In the range of 60 - 80 db
E)Generally more than 100 db

Question 13

A process of zinc diffusion is known as

A)Brazing
B)Anodising
C)Sintering
D)Sherardizing
E)Metallizing

Question 14

Which of the following can be used to produce laser?

A)Diamond
B)Gold
C)Platinum
D)Emerald
E)Ruby

Question 15

The accuracy of a limit gauge can be checked by

A)Vernier caliper
B)Micrometer
C)Slip gauge
D)Sine bar
E)Any of the above

Question 16

The tool used for grooving a seam is called

A)Parting off
B)Breasing stake
C)Rivet set
D)Groover

Question 17

The tool may fail suddenly because of

A)crater wear
B)both crater and flank wear
C)spalling
D)Parting off
E)flank wear

Question 18

Knurling is an operation

A)Of cutting smooth collars
B)Of under cutting
C)Done prior to screw cutting
D)Of generally roughing the surface for hand grip
E)Done without use of coolant

Question 19

Which of the following material has maximum shrinkage during solidification?

A)Parting off
B)Copper
C)Aluminium
D)Steel
E)Cast iron

Question 20

Which of the following process is preferred for cutting and welding of nonferrous metals?

A)Submerged arc welding
B)Inert gas arc welding
C)MIG welding
D)DC arc welding
E)None of the above

Question 21

The riser in a mould should be located in such a way so that

A)it touches all parts of the casting
B)it is first to receive the molten metal
C)Parting off
D)it is last to solidify
E)it is first to solidify

Question 22

In a drilling operation

A)Torque is equal to the axial force
B)Torque is more than the axial force
C)None of above
D)Torque is half the axial force
E)Torque is less than the axial force

Question 23

Poor fusion in a welded joint may be due to

A)Lack of flux
B)Improper current
C)High welding speed
D)Dirty metal surface
E)None of the above

Question 24

Merchant's machinability constant is

A)2 ? - ? - ?
B)500 tons to 1000 tons
C)2 ? - ? + ?
D)? + ? - ?
E)2 ? + ? - ?

Question 25

Type of gears used in electric switch gear is

A)Bevel gears
B)Herringbone gears
C)Gears are not used in switch gear
D)Helical gears
E)Spiral gears

Question 26

The power consumption in laser beam machining is of the order of

A)2 kW/m³/min
B)270 kW/m³/min
C)2700 kW/m³/min
D)5000 kW/m³/min
E)27 kW/m³/min

Question 27

A foil is

A)Same as sheet
B)Same as strip
C)A cold rolled sheet
D)A thin strip with maximum width 300 mm and a maximum thickness of 1.5 mm
E)None of the above

Question 28

Vertical centrifugal castings as compared to horizontal centrifugal castings are spun at

A)Lower speeds
B)Higher speeds
C)Same speed
D)Varying speeds
E)None of the above

Question 29

For a peripheral speed of 35 m/s, a grinding wheel of 800 mm diameter must rotate at

A)1600 rpm
B)835 rpm
C)435 rpm
D)60 rpm
E)85 rpm

Question 30

In a lathe gear box if first four consecutive speed are 19, 30, 47, 74 rpm, the next speed would be

A)116 rpm
B)104 rpm
C)111 rpm
D)93 rpm
E)101 rpm

Question 31

EDM is generally preferred for

A)Hard materials
B)Cast materials
C)Non-metallic compounds
D)Non-ferrous materials
E)Polymers

Question 32

Grey iron is usually welded by

A)Resistance welding
B)Arc welding
C)TIG welding
D)Gas welding
E)MIG welding

Question 33

The machine allowance on castings does depend on

A)Size of the casting
B)Shape of the casting
C)Temperature of molten material
D)All of the above
E)None of the above

Question 34

A strip is

A)A section other than rectangular
B)A sheet less than 6 mm in thickness and 300 mm in width
C)A cold rolled sheet
D)Same as sheet
E)Same as plate

Question 35

On a die accurate holes are to be drilled. Which machine would you prefer for this operation?

A)Parting off
B)Radial drilling machine
C)Portable drilling machine
D)Jig boring machine
E)Multi-pindle drilling machine

Question 36

Which one of the following is used for thermocouple junctions?

A)Muntz metal
B)Elinvar
C)Manganin
D)Duralumin
E)Nichrome

Question 37

The property due to which sand grains stick together is known as

A)adhesiveness
B)Parting off
C)permeability
D)cohesiveness
E)plasticity

Question 38

In case of very hard surfaces the Brinell Hardness test method fails to give reliable results because

A)Ball does not force into the metal
B)Ball deforms on very hard surfaces
C)Ball slips along the surface
D)It is generally not desired to use this method in such cases
E)None of the above

Question 39

Shot blasting is

A)Process of cleaning moulding sand
B)Process of cleaning spherical objects only
C)Process of supplying blast of hot air to cupola
D)Process of cleaning castings
E)Process of cleaning core sand

Question 40

Which of the following source for laser beam can give the highest power density (W/mm²)?

A)Laser continuous
B)Plasma arc
C)Laser pulsed
D)All have the same power density
E)Electron beam

Question 41

A flycutter is used on

A)Planer
B)Slotter
C)Shaper
D)Milling machine
E)Lathe

Question 42

High rate of oscillation of tools in ultrasonic machining is produced by

A)Pneumatic generator
B)Explosives
C)D.C. motor
D)Oscillator
E)A.C. motor

Question 43

Slip gauges are made of

A)Aluminium
B)Copper
C)Alloy steel
D)Stainless steel
E)Cast iron

Question 44

A third flask sometimes used between cope and drag is called

A)Core
B)Middle
C)Check
D)Riddle
E)Fillet

Question 45

Which of the following is a ferrous cutting tool?

A)Diamond
B)Cast carbides
C)HSS
D)Ceramics
E)Parting off

Question 46

Gear cutter No. 1 for cutting gears on milling machine is used for

A)17 to 20 teeth
B)135 to 150 teeth
C)12 to 13 teeth
D)Racks only
E)55 to 120 teeth

Question 47

DIN specifications have been developed in

A)Austria
B)Russia
C)America
D)Germany
E)England

Question 48

A steady rest is used

A)During taper turning
B)During threading operation
C)For supporting the bed
D)While cutting heavy and log jobs
E)During finishing operation

Question 49

During electron beam welding the vacuum is of the order of

A)10-5 torr
B)1 torr
C)10-3 torr
D)10-4 torr
E)10-2 torr

Question 50

Which one does not fit with rest in the following?

A)Jaw chuck
B)Drill
C)Tapping
D)Reamer
E)Pipe cutter