Q.1

In a four high rolling mill, the diameter of backing up rolls is __________ the diameter of working rolls.

  • equal to
  • smaller than
  • larger than
Q.2

Fin is a casting defect which is due to thin projections of metal not intended as a part of casting.

  • Correct
  • Incorrect
Q.3

In a gas welding of mild steel using an oxy-acetylene flame, the total amount of acetylene consumed islitre. The oxygen consumption from the cylinder is

  • 5 litre
  • 10 litre
  • 15 litre
  • 20 litre
Q.4

The property of sand due to which the sand grains stick together, is called

  • collapsibility
  • permeability
  • cohesiveness
  • adhesiveness
Q.5

If an aluminium pattern made from a wooden master pattern is to be used for grey iron castings, then the shrinkage allowance allowed on the wooden pattern should be

  • 10 mm/m
  • 16 mm/m
  • 20 mm/m
  • 26 mm/m
Q.6

Swab is used for

  • smoothing and cleaning out depressions in the mould
  • cleaning the moulding sand
  • moistening the sand around the edge before removing pattern
  • reinforcement of sand in the top part of the moulding box
Q.7

The two rolls in a two high rolling mills are of __________ size.

  • equal
  • different
Q.8

According to Indian standard specifications,H6/g 5 means that.

  • basic size is 100 mm
  • actual size is 100 mm
  • difference between the actual size and basic size is 100 mm
  • none of the above
Q.9

In tungsten-inert gas arc welding, a __________ electrode is used.

  • consumable
  • non-consumable
Q.10

The binder commonly used in making oil sand, is

  • clay-type binder
  • organic-type binder
  • inorganic-type binder
  • any one of these
Q.11

The diaphragm moulding machine is used to

  • ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
  • ram the sand harder at the back of the mould and softer on the pattern face
  • produce uniform packing of sand in the mould
  • give uniform sand hardness throughout the mould
Q.12

The welding process used to join the ends of two pipes of uniform cross-section, is

  • spot welding
  • seam welding
  • projection welding
  • upset butt welding
Q.13

The process of increasing the cross-section of a bar at the expense of its length, is called

  • drawing down
  • upsetting
  • spinning
  • peening
Q.14

The sand used for making cores is

  • green sand
  • dry sand
  • loam sand
  • oil sand
Q.15

The temperature produced by oxy-hydrogen flame is about

  • 1800° C
  • 2100° C
  • 2400° C
  • 3200° C
Q.16

For arc welding

  • alternating current with high frequency is used
  • alternating current with low frequency is used
  • direct current is used
  • any one of these
Q.17

The temperature of the inner luminous cone of neutral flame is about

  • 1000° C
  • 1250° C
  • 2100° C
  • 3200° C
Q.18

The welding process used in joining mild steel shanks to high speed drills, is

  • spot welding
  • seam welding
  • flash butt welding
  • upset butt welding
Q.19

Which of the following statement is wrong?

  • The hot chamber die casting machine is used for casting zinc, tin, lead and other low melting alloys.
  • The cold chamber die casting machine is used for casting aluminium, magnesium, copper base alloys and other high melting alloys.
  • The castings produced by centrifugal casting method have open and coarse grained structure.
  • all of the above
Q.20

The diaphragm moulding machine is used to

  • ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
  • ram the sand harder at the back of the mould and softer on the pattern face
  • produce uniform packing of sand in the mould
  • give uniform sand hardness throughout the mould
Q.21

When the dimension is expressed as , then the tolerance is

  • 0.035 mm
  • 0.025 mm
  • 0.01 mm
  • 0.06 mm
Q.22

When the molten metal is fed in the cavity of a metallic mould by gravity, the method of casting is known as

  • die casting method
  • slush casting method
  • permanent mould casting method
  • centrifugal casting method
Q.23

In TIG arc welding, the welding zone is shielded by an atmosphere of

  • helium gas
  • argon gas
  • either (a) or (b)
  • none of these
Q.24

Sand wash is a casting defect which

  • results in a mismatching of the top and bottom parts of a casting
  • results in general enlargement of the casting
  • occurs near the ingates as rough lumps on the surface of a casting
  • occurs as sand patches on the upper surface of a casting
Q.25

When the file is moved to and fro over the work, it is known as

  • cross filing
  • draw filing
  • pull and push filing
  • none of these
Q.26

The metal patterns as compared to wooden patterns require less

  • shrinkage allowance
  • machining allowance
  • draft allowance
  • distortion allowance
Q.27

The mode of deformation of the metal during spinning is

  • bending
  • stretching
  • rolling and stretching
  • bending and stretching
Q.28

The edge of a steel plate cut by oxygen cutting will get hardened when the carbon content is

  • less than 0.1 percent
  • less than 0.3 percent
  • more than 0.3 percent
  • any where between 0.1 to 1 percent
Q.29

Hot piercing is extensively used for making bolts and nuts.

  • Yes
  • No
Q.30

The metal extrusion process is generally used for producing

  • uniform solid sections
  • uniform hollow sections
  • uniform solid and hollow sections
  • varying solid and hollow sections
Q.31

Cold working distorts grain structure and does not provide an appreciable reduction in size.

  • Correct
  • Incorrect
Q.32

Loam sand is a mixture of

  • 30% sand and 70% clay
  • 50% sand and 50% clay
  • 70% sand and 30% clay
  • 90% sand and 10% clay
Q.33

The upsetting is a process of

  • increasing the cross-section of a bar
  • reducing the cross-section of a bar
  • joining the two surfaces of metal under pressure after heating
  • bending of a bar
Q.34

The operation of cutting a cylindrical hole in a sheet of metal by the punch and die is called

  • shearing
  • piercing
  • punching
  • blanking
Q.35

The cold chisels are made from

  • cast iron
  • mild steel
  • high speed steel
  • cast tool steel
Q.36

A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

  • The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction.
  • The upper and bottom rolls rotate in the same direction whereas the middle roll rotate in opposite direction.
  • The bottom and middle roll rotate in the same direction.
  • any one of the above
Q.37

If neutral flame is used in oxy-acetylene welding, both oxygen and acetylene cylinders of the same capacity will be emptied at the same time.

  • Correct
  • Incorrect
Q.38

Cutting and forming operations can be performed in a single operation in a

  • simple die
  • progressive die
  • compound die
  • combination die
Q.39

The process extensively used for making bolts and nuts is

  • hot piercing
  • extrusion
  • cold peening
  • cold heading
Q.40

For welding plates of thickness more than 12.5 mm, its edges

  • do not require bevelling
  • should be bevelled to a single-V or U-groove
  • should have a double-V or U-groove on one side
  • should have a double-V or U-groove on both sides
Q.41

In order to cut mild steel, the cutting angle of chisel should be

  • 30°
  • 45°
  • 50°
  • 60°
Q.42

In die casting, machining allowance is

  • small
  • large
  • very large
  • not provided
Q.43

In spot welding, the spacing between two spot weld should not be less than

  • d
  • 1.5 d
  • 3 d
  • 6 d
Q.44

The shrinkage allowance for cast iron pattern is

  • 10 mm/m
  • 16 mm/m
  • 20 mm/m
  • 26 mm/m
Q.45

To prevent the body of the blade from jamming in the saw cut, the teeth of blade are

  • strengthened
  • sharpened
  • set
  • all of these
Q.46

The oxy-acetylene gas used in gas welding produce a flame temperature of

  • 1800°C
  • 2100°C
  • 2400°C
  • 3200°C
Q.47

Metal patterns require __________ draft allowance than wooden patterns.

  • more
  • less
Q.48

Which of the following material can be used for making patterns ?

  • Aluminium
  • Wax
  • Lead
  • all of these
Q.49

The teeth of hacksaw blade are bent

  • towards right
  • towards left
  • alternately towards right and left and every third or fourth left straight
  • may be bent in any direction
Q.50

Spot welding is used for welding

  • lap joints in plates having 0.025 mm to 1.25 mm thickness
  • lap joints in plates having thickness above 3 mm
  • butt joints in plates having 0.025 mm to 1.25 mm thickness
  • butt joints in plates having thickness above 3 mm
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