Deck 13: Techniques for Hardness Testing, Drilling, Machining, Welding, and Casting

Question 1

In Rockwell hardness test the hardness is measured by

A)The width of depression
B)The depth of depression.
C)Diameter of depression
D)None of the above
E)None of the above.

Answer 1

The depth of depression.

Question 2

The cutting edges of a twist drill are known as

A)Flanks
B)Wedges
C)Flutes
D)Lips
E)None of the above

Answer 2

Lips

Question 3

Which of the following is the best method for drilling, 1 mm hole in glass?

A)Laser drilling
B)Garbide tipped drilling
C)Plasma arc drilling
D)Ultrasonic machining
E)Electron beam drilling

Answer 3

Ultrasonic machining

Question 4

While drilling on marble, the point angle should be

A)10°
B)120°
C)80°
D)112°
E)118°

Question 5

Glazing of grinding wheels is easily identified by

A)Shiny sppearance on the face of the wheel
B)black spots on the grinding face
C)formation of cavities on the wheel
D)None of the above
E)Parting off

Question 6

Match plate pattern is used in

A)Greens and moulding
B)Pillar moulding
C)Bench moulding
D)Machine moulding
E)Pit moulding

Question 7

Generally rubber, leather, fibre etc. are blanked by the process of

A)drinking
B)broaching
C)notching
D)lancing
E)Parting off

Question 8

A fly cutter is used on

A)Metal spinning lathe
B)Capstan lathe
C)Lathe
D)Shaper
E)Milling machines

Question 9

Draft or taper allowance in patterns is provided on

A)All vertical surfaces of the pattern
B)All round surfaces of pattern
C)All sides of patterns
D)All corners of the pattern
E)All horizontal surfaces of the pattern

Question 10

CO₂ sand is used

A)for low temperature alloys
B)for non-ferrous castings
C)Parting off
D)for producing hard surface around the mould
E)for mass production of castings

Question 11

Which of the following is an interference fit?

A)Push fit
B)Shrink fit
C)Sliding fit
D)Running fit
E)Light keying fit

Question 12

The advantage of electro chemical machining is

A)There is virtually no wear of the tool
B)No burrs are produced
C)The rate of metal removal does not depend on the physical properties of the metal
D)The surface produced is free from mechanical stresses
E)All of the above

Question 13

Brown and sharpe taper is generally used in

A)Lathes
B)Shapers
C)Drills
D)Milling machines
E)Broaching machines

Question 14

A master gauge is

A)Used by all mechanics
B)A gauge used by experienced technician
C)None of above
D)Used by masters
E)A standard gauge for checking accuracy of gauges used on shop floors

Question 15

Goose neck tools are used on

A)Grinders
B)Planers
C)Capstan lathes
D)Wood working lathes
E)Milling machines

Question 16

The advantage of laser beam machining is

A)High production rates
B)Minimum heat affected zone
C)Dissimilar metals can be welded
D)Precise operation
E)All of the above

Question 17

A tool signature, the nose radius is indicated

A)In the middle
B)Second from end
C)Second position
D)In the first position
E)In the last position

Question 18

In wire cut EDM the electrode is

A)Parting off
B)a thin wire
C)a copper bar
D)a thin sheet
E)a tungsten plate

Question 19

The type of bearing to be selected for application where low torque, low coefficient of friction, non-magnetic properties and long life are required would be

A)Needle bearing
B)Ball bearing
C)Bush bearing
D)Roller bearing
E)Jewel bearing

Question 20

Which of the following process needs high voltage for its operation?

A)Plasma arc machining
B)Ultrasonic machining
C)Abrasive jet machining
D)Electro chemical machining
E)Electron beam machining

Question 21

All of the following are used for oblique cutting EXCEPT

A)Parting off
B)Slotting cutter
C)Drills
D)Milling cutters
E)Lathe tools

Question 22

In which of the following welding process the transfer of metal from the electrode occurs due to molecular attraction?

A)Metallic arc welding
B)Thermit welding.
C)Thermit welding
D)DC arc welding
E)None of the above

Question 23

Hacksaw used for cutting steel, cast iron, aluminium etc, has the following number of teeth per centimeter

A)Parting off
B)12
C)7
D)10

Question 24

A twist drill is specified by

A)The size of hole it can drill
B)A number specifying hole size
C)A letter of alphabet
D)Any of the above
E)None of above

Question 25

In a sine bar the standard length is measured from

A)Edge to edge
B)Between inner circumference of two buttons
C)Between out circumference of two buttons
D)Between the centers of two buttons
E)Any of the above

Question 26

Thermit welding differs from other methods of welding in the following way

A)It does not use heat
B)It employs exothermal chemical reaction for developing high temperature
C)It is less time consuming
D)It does not require electrodes
E)None of the above

Question 27

Usual width of a hacksaw blade is

A)15 mm
B)Parting off
C)10 mm and above
D)12.7 mm

Question 28

Depth of cut is normally

A)Parting off
B)more for roughing operation and less for finishing operation
C)less for roughing operation and more for finishing operation
D)same for roughing as well as finishing operations

Question 29

Cutting speed of three tool materials, viz : H.S.S., carbide and ceramic for a given work materials and fixed tool life will increase in this order

A)carbide H.S.S. ceramic
B)Carbide ceramic H.S.S.
C)H.S.S. carbide ceramic
D)None of the above
E)Parting off

Question 30

The capacity of cupola is usually in the range

A)500 tons to 1000 tons
B)100 to 250 tons
C)10 tons 10 100 tons
D)250 tons to 400 tons

Question 31

The shape of chips during broaching operation is

A)Short helical
B)Continuous
C)Small fragments
D)Long-helical
E)Closed spirals

Question 32

In sand moulding the bottom flask is called

A)Drag
B)Riddle
C)Cope
D)Fillet
E)Check

Question 33

All mechanical seals have two flat sealing surfaces

A)At right angles to the axis of rotation
B)Parallel to the axis of rotation
C)Parallel to the end plate
D)None of the above.
E)None of the above

Question 34

The bit of solder iron is generally made of

A)Copper
B)Cast iron
C)High speed steel
D)Stainless steel
E)Mild steel

Question 35

The smallest thickness that can be measured by a slip gauge is

A)0.01 mm
B)1.001 mm
C)0.001 mm
D)1 mm
E)0.1 mm

Question 36

Which one does not fit with the rest in the following?

A)Scale
B)Micrometer
C)Pitch gauge
D)Twist drill
E)Vernier caliper

Question 37

For cutting mild steel the cutting angle of a chisel should be

A)35°
B)75°
C)55°
D)70°
E)60°

Question 38

A point angle of 135 - 150° on twist drills is used for drilling

A)Mild steel
B)Hard steels and nickel alloys
C)Cast iron
D)Bakelite
E)Plastics

Question 39

While using high speed steel tools on lathe the speed of chuck will be lowest while machining

A)White metal
B)Aluminium
C)Brass
D)Copper
E)Cast iron

Question 40

The pieces of material that are removed when punching holes in tape are known as

A)Cermets
B)Fillings
C)Circles
D)Clad
E)Burrs

Question 41

Which one of the following is known as trarmel?

A)A pair of steel legs joined by a screw and nut
B)A steel bar and two sliding legs which can be adjusted
C)A divider with a spring
D)None of the above
E)Short rule

Question 42

Joggled welded joints are used

A)For heavy loading where the upper surface of both pieces must be in the same plane
B)For jobs subjected to fatigue stresses
C)For joining two dissimilar metals
D)For joining two materials of different thicknesses
E)For light loading where the upper surface of both pieces must be in contact

Question 43

The passage way of bringing the molten metal to the mould cavity is known as

A)Entry system
B)Loading system
C)Delivery system
D)Gating system
E)Piping system

Question 44

A non-consumable electrode is used in

A)Gas welding
B)DC arc welding
C)AC arc welding
D)Argon arc welding
E)None of the above

Question 45

Thermistors are

A)Clad metals used in accurate measurement of temperature changes
B)Semi-conductor materials having large negative coefficient of resistance
C)Materials highly sensitive to temperature changes
D)Used for measurement of thermal properties
E)Bimetallic strips used in thermometers

Question 46

Helical grooves are provided on a drill bit

A)To provide long cutting edge
B)To guide the cutting top
C)To reduce the cost of the drill bit
D)To provide a passage for the coolant
E)To remove chips

Question 47

A soldering iron is used mainly to

A)Heat the metal
B)Melt the solder
C)Heat the flux
D)None of these
E)None of the above

Question 48

Which of the folliwjng is not an abrading process?

A)Grinding
B)Lapping
C)Tumbling
D)Honing
E)Parting off

Question 49

The binding material used in cemented carbide tools is

A)Sulphur
B)Carbon
C)Chromium
D)Cobalt
E)Nickel

Question 50

Chromatography is

A)The method of determining alloying elements in steels
B)The method of analysis of flame types
C)The method of determination of smoke density of exhaust gases
D)The method of determining each constituent in a complex vapour or gas mixture
E)The method of analysis of flame colours for temperature determination

Question 51

Which of the following drilling machine is used for mass production?

A)Radial drilling machine
B)Gang drilling machine
C)Parting off
D)Pistol drilling machine
E)Bench drilling machine

Question 52

While machining copper alloys with HSS tools, the cutting speed is

A)100 to 150 m/min
B)50 to 100 m/min
C)200 to 300 m/min
D)Parting off
E)20 to 30 m/min

Question 53

A gold point is

A)The pointed on a instrument a reading beyond which may be dangerous to system
B)The pointed location spot gold plated
C)The temperature of equilibrium between liquid gold and gold vapour at normal atmospheric pressure
D)The temperature at which gold melts
E)The temperature of equilibrium between solid gold and liquid gold at normal atmospheric pressure

Question 54

Which bond is commonly used in grinding wheel

A)Silicate bond
B)Shellac bond
C)Resinoid bond
D)Vitrified bond
E)Rubber bond

Question 55

The percentage of carbon that must be present in steel before it can be hardened noticeably is

A)0.20 percent
B)0.30 percent
C)0.70 percent
D)0.10 percent
E)0.05 percent

Question 56

While turning which of the following material back rake angle is the largest?

A)Parting off
B)Hard steel
C)Aluminium
D)Cast iron
E)Monel matal

Question 57

Coolant used while turning cast iron is

A)Lard oil
B)Soluble oil
C)Kerosene
D)Soda water
E)None of the above

Question 58

Which of the following is always die casted?

A)Rollers for bearings
B)Carburettor body
C)Parting off
D)Pump shafts
E)Balls for ball mills

Question 59

Materials that produce continuous chips are

A)Cast iron
B)Low carbon steel
C)Brass
D)None of the above
E)Parting off

Question 60

The gases used in tungsten inert gas welding are

A)Argon and helium
B)Helium and neon
C)Ozone and neon
D)Atomic hydrogen and neon
E)Carbonsioxide and nitrogen

Question 61

High carbon steels contain carbon

A)Between 0.6 to 1.3 percent
B)Between 0.05 to 0.6 percent
C)More than 1.7 percent
D)Between 1.3 to 1.7 percent
E)0.70 percent

Question 62

The feed depends on

A)finish required
B)depth of cut
C)rigidity of machine
D)All of the above
E)Parting off

Question 63

Which of the following materials will have highest value of contraction allowance

A)Aluminium
B)Brass
C)Cast iron
D)Malleable iron
E)Bronze

Question 64

A stick is

A)A tool for lifting the pattern from mould
B)A tool for mostening the sand
C)A hand tool for repairing mould in foundry shop
D)A device for measuring moisture content in foundry sand
E)Automatic moulding tool

Question 65

In automatic control systems a good control is

A)One that is automatically controlled
B)One that gives high operating efficiency
C)One that gives good results
D)One that gives maximum production
E)One that has minimum deviation following a disturbance

Question 66

In a 48A 100-H-8-S-BE grinding wheel the type of bond used is

A)Silicate
B)Resinoid
C)Shellac
D)Vitrified
E)Rubber

Question 67

Which of the following metal takes smallest side rake angle during turning?

A)Cast iron
B)Parting off
C)Brass
D)Monel metal
E)Aluminium

Question 68

Lead and sulphur when added to low carbon steel promote

A)chip breaking
B)continuous chip formation
C)continuous chip with built up edges
D)None of the above
E)Parting off

Question 69

Which of the following process is used for casting ornamental objects, toys and similar articles?

A)Slush casting
B)Open mould casting
C)Semi-centrifugal casting
D)Die casting
E)None of the above

Question 70

Plug welded joints are used

A)For welding at selected spots only
B)For jobs carrying shear stress
C)For jobs of dissimilar materials
D)To join two pieces of metal in the same manner as riveted joint metals
E)To join a circular metal with a flat job

Question 71

Austenitic stainless steel contain

A)at least 24 percent of combined chromium and nickel
B)4 to 6 percent of chromium
C)chromium which is 17 times the percentage of carbon
D)None of the above
E)Parting off

Question 72

Shatter test is conducted to measure

A)Toughness of sand
B)Toughness of core
C)Toughness of pattern
D)Toughness of mould
E)Toughness of casting

Question 73

Which one of the following materials will have lowest cutting speed?

A)High carbon steel
B)Mild steel
C)Bronze
D)Brass
E)Aluminium

Question 74

Spindle speed in a lathe for turning a 40 cm dia rod at a cutting speed of 30 m/min would be

A)100 rpm
B)336 rpm
C)238 rpm
D)468 rpm
E)206 rpm

Question 75

Dial indicator is a

A)comparator
B)recording device
C)transducer
D)sensor
E)Parting off