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4

In a four high rolling mill, there are four rolls out of which

A. One is working roll and three are backing up rolls

B. Two are working rolls and two are backing up rolls

C. Three are working rolls and one is backing up roll

D. All of the four are working rolls

Correct Answer :

B. Two are working rolls and two are backing up rolls


Related Questions

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4

During drawing operation, the states of stress in cup would include

A. Compressive stress in the flange

B. Tensile stress in the wall

C. Both (A) and (B)

D. None of these

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4

In a centrifugal casting method

A. Core is made of sand

B. Core is made of ferrous metal

C. Core is made of nonferrous metal

D. No core is used

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4

For gas welding, the pressure desired at the welding torch for acetylene is

A. 7 to 103 kN/m²

B. 70 to 280 kN/m²

C. 280 to 560 kN/m²

D. 560 to 840 kN/m²

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4

V-block is used to

A. Check the trueness of flat surfaces

B. Locate centres of round rods

C. Check the surface roughness

D. None of these

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4

The oxyacetylene gas used in gas welding produce a flame temperature of

A. 1800°C

B. 2100°C

C. 2400°C

D. 3200°C

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4

During cold working process

A. Grain structure is distorted

B. Strength and hardness of metal increases

C. Close dimensional tolerance can be maintained

D. All of the above

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4

In a gas welding of mild steel using an oxyacetylene flame, the total amount of acetylene consumed is 10 litres. The oxygen consumption from the cylinder is

A. 5 litres

B. 10 litres

C. 15 litres

D. 20 litres

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4

A mortise gauge is a

A. Striking tool

B. Planing tool

C. Boring tool

D. Marking tool

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4

In blanking operation, the clearance is provided on

A. Punch

B. Die

C. Half on the punch and half on the die

D. Either on punch or die depending upon designer's choice

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4

A basic hole is one whose

A. Lower deviation is zero

B. Upper deviation is zero

C. Lower and upper deviations are zero

D. None of these

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4

The cold chisels are made from

A. Cast iron

B. Mild steel

C. High speed steel

D. Cast tool steel

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4

In a cold chamber die casting machine

A. Melting pot is separate from the machine

B. Melting pot is an integral part of the machine

C. Melting pot may have any location

D. Low temperature and pressure is used

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4

The cross-section of a chisel is usually

A. Rectangular

B. Square

C. Hexagonal

D. Octagonal

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For obtaining a cup of diameter 25 mm and height 15 mm by drawing, the size of the round blank should be approximately

A. 42 mm

B. 44 mm

C. 46 mm

D. 48 mm

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4

In order to check the clearance between two mating surfaces, a ________ gauge should be used.

A. Ring

B. Plug

C. Feeler

D. None of these

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4

In order to ram the sand harder at the back of the mould and softer on the pattern face, a ________ is used.

A. Sand slinger

B. Squeezing machine

C. Jolt machine

D. Stripper plate machine

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4

Seam welding is best adopted for metal thickness ranging from

A. 0.025 to 3 mm

B. 3 to 5 mm

C. 5 to 8 mm

D. 8 to 10 mm

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A file with 20 teeth in 25 mm is called

A. Rough file

B. Bastard file

C. Second cut file

D. Smooth file

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Swab is used for

A. Smoothing and cleaning out depressions in the mould

B. Cleaning the moulding sand

C. Moistening the sand around the edge before removing pattern

D. Reinforcement of sand in the top part of the moulding box

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4

The temperature produced by oxy-hydrogen flame is about

A. 1800°C

B. 2100°C

C. 2400°C

D. 3200°C

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4

In forehand welding, the weld is made

A. From left to right

B. From right to left

C. First from left to right and then from right to left

D. Either from left to right or from right to left

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4

Rotary swaging

A. Is extensively used for making bolts and rivets

B. Is used for reducing the diameters of round bars and a tube by rotating dies which open and close rapidly on the work

C. Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface

D. Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

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The punch and die set up is ________ for punching and piercing operation.

A. Same

B. Similar

C. Different

D. None of these

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The process used to improve fatigue resistance of the metal by setting up compressive stresses in its surface, is known as

A. Hot piercing

B. Extrusion

C. Cold peening

D. Cold heading

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4

The property of sand due to which it evolves a great amount of steam and other gases is called

A. Collapsibility

B. Permeability

C. Cohesiveness

D. Adhesiveness

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4

A two high rolling mill consists of two rolls which rotate

A. At the same speed and in the same direction

B. At the same speed but in opposite direction

C. At different speeds and in the same direction

D. At different speeds and in the opposite direction

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The surface to be machined is marked on the pattern by

A. Red colour

B. Yellow colour

C. Black colour

D. Blue colour

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4

The recrystallisation temperature of steel is

A. 400°C

B. 600°C

C. 800°C

D. None of these

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4

The upsetting is a process of

A. Increasing the cross-section of a bar

B. Reducing the cross-section of a bar

C. Joining the two surfaces of metal under pressure after heating

D. Bending of a bar

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4

For welding plates of thickness less than 5 mm, its edges

A. Do not require bevelling

B. Should be bevelled to a single-V or U-groove

C. Should have a double-V or U-groove on one side

D. Should have a double-V or U-groove on both sides