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Current Affairs January 2024

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4

The common welding error that occurs due to wrong speed, faulty preparation, and high / low current, improper electrode size is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

Correct Answer :

D. Poor fusion


Related Questions

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4

Flank wear depends upon the

A. Hardness of the work and tool material at the operating temperature

B. Amount and distribution of hard constituents in the work material

C. Degree of strain hardening in the chip

D. All of these

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4

In a shaper, the length of stroke is increased by

A. Increasing the centre distance of bull gear and crank pin

B. Decreasing the centre distance of bull gear and crank pin

C. Increasing the length of the arm

D. Decreasing the length of the slot in the slotted lever

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4

The tail stock set over method of taper turning is preferred for

A. Internal tapers

B. Small tapers

C. Long slender tapers

D. Steep tapers

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4

In ultrasonic machining, tool is made of

A. Tungsten carbide

B. Brass or copper

C. Diamond

D. Stainless steel

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4

The percentage of carbon in gray cast iron is in the range of

A. 0.25 to 0.75 percent

B. 1.25 to 1.75 percent

C. 3 to 4 percent

D. 8 to 10 percent

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4

Which of the following statement is correct in regard to centreless grinding?

A. The workpiece is supported throughout its entire length as grinding takes place.

B. It is a continuous process and adopted for production work.

C. It requires no holding device for the work.

D. All of the above

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4

Cold working of steel is defined as working

A. At its recrystallisation temperature

B. Above its recrystallisation temperature

C. Below its recrystallisation temperature

D. At two thirds of the melting temperature of the metal

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4

The cutting force in up milling __________ per tooth movement of the cutter.

A. Is zero

B. Is maximum

C. Decreases from maximum to zero

D. Increases from zero to maximum

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A grinding wheel is said to be of _________ if the abrasive grains can be easily dislodged.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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4

The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.

A. Equal to

B. Twice

C. Thrice

D. One-half

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4

Down milling is also called

A. Conventional milling

B. Climb milling

C. End milling

D. Face milling

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The drill spindles are provided with standard taper known as

A. Morse taper

B. Seller's taper

C. Chapman taper

D. Brown and Sharpe taper

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4

A fine grained grinding wheel is used to grind

A. Hard and brittle materials

B. Soft and ductile materials

C. Hard and ductile materials

D. Soft and brittle materials

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4

Glazing in grinding wheels __________ cutting capacity.

A. Has no effect on

B. Increase

C. Decrease

D. None of these

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4

The purpose of jigs and fixtures is to

A. Increase machining accuracy

B. Facilitate interchangeability

C. Decrease expenditure on quality control

D. All of these

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4

Ceramic tools are fixed to tool body by

A. Soldering

B. Brazing

C. Welding

D. Clamping

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4

Misrun is a casting defect which occurs due to

A. Very high pouring temperature of the metal

B. Insufficient fluidity of the molten metal

C. Absorption of gases by the liquid metal

D. Improper alignment of the mould flasks

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4

Friction at the tool-chip interface can be reduced by

A. Decreasing the rake angle

B. Increasing the depth of cut

C. Decreasing the cutting speed

D. Increasing the cutting speed

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4

The grade of grinding wheel depends upon

A. Hardness of the material being ground

B. Speed of wheel and work

C. Condition of grinding machine

D. All of these

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4

Broaching is applied for machining

A. Internal and external surfaces

B. Round or irregular shaped holes

C. External flat and contoured surfaces

D. All of these

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In order to obtain a surface finish in the range of 0.75 μm to 1.25 μm , the operation used is called.

A. Grinding

B. Lapping

C. Honing

D. Buffing

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4

The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

A. Equal to

B. Smaller than

C. Greater than

D. None of these

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4

Which of the following statement is correct for orthogonal cutting system?

A. The cutting edge of the tool is perpendicular to the direction of tool travel.

B. The cutting edge clears the width of the workpiece on either ends.

C. The chip flows over the tool face and the direction of the chip flow velocity is normal to the cutting edge.

D. All of the above

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4

A feed gear box for a screw cutting lathe is designed on the basis of

A. Geometric progression

B. Arithmetic progression

C. Harmonic progression

D. None of these

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4

The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)

A. πd

B. πdn

C. πdn sinα

D. πdn cosα

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4

The rake angle required to machine brass by high speed steel tool is

A.

B. 10°

C. 20°

D. 100°

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For machining a cast iron workpiece by a high speed steel tool, the average cutting speed is

A. 10 m/min

B. 15 m/min

C. 22 m/min

D. 30 m/min

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4

A single point thread cutting tool should ideally hav

A. Zero rake angle

B. Positive rake angle

C. Negative rake angle

D. Point angle

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4

The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are

A. 1, 2, 2

B. 1, 2, 4

C. 2, 3, 4

D. 2, 4, 4

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4

Side relief angle of a single point tool is the angle

A. By which the face of the tool is inclined towards back

B. By which the face of the tool is inclined sideways

C. Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of tool

D. Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base