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Current Affairs January 2024

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4

What is the name of the device used in arc welding circuits for the purpose of modifying the rate of current change when the weld road is varied rapidly?

A. Reactor

B. Kerf

C. Inductor

D. Cone

Correct Answer :

C. Inductor


Related Questions

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4

In centreless grinding, work place centre will be

A. Above the line joining the two wheel centres

B. Below the line joining the two wheel centres

C. On the line joining the two wheel centres

D. At the intersection of the line joining the wheel centres with the work place plane

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NC contouring is an example of

A. Continuous path positioning

B. Point-to-point positioning

C. Absolute positioning

D. Incremental positioning

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4

In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops / sec or less, what is this known as

A. Globular transfer

B. Spray transfer

C. GMAW practice

D. Dip transfer

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4

The cutting speed of a drill depends upon the

A. Material of drill

B. Type of material to be drilled

C. Quality of surface finish desired

D. All of these

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4

If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is

A. Conical locator

B. Cylindrical locator

C. Diamond pin locator

D. Vee locator

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4

The increase in depth of cut and feed rate __________ surface finish.

A. Improves

B. Deteriorates

C. Does not effect

D. None of these

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4

The helix angle of a drill is __________ for drilling brass.

A. Equal to 30°

B. Less than 30°

C. More than 30°

D. None of these

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4

In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰⁰³⁰, the maximum interference (in microns) in the assembly is

A. 40

B. 30

C. 20

D. 10

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4

Crack in grinding wheel is developed due to

A. High temperature developed at the contact of the wheel face and work

B. Grinding hard work

C. Low speed of wheel

D. High speed of wheel

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4

While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is

A. Independent of index change gear ratio

B. Dependent on speed change gear ratio

C. Interrelated to index change gear ratio

D. Independent of speed and index change gear ratio

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4

Ceramic cutting tools are

A. Made by cold pressing of aluminium oxide powder

B. Available in the form of tips

C. Brittle and have low bending strength

D. All of these

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In _________ operation, the chip thickness is minimum at the beginning of the cut and it reaches to the maximum when the cut terminates.

A. Conventional milling

B. Climb milling

C. Face milling

D. End milling

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4

A hole is of dimension φ = 9 ₊0⁺⁰⁰¹⁵ mm. The corresponding shaft is of dimension φ = 9 ₊0.001⁺⁰⁰¹⁰ mm. The resulting assembly has

A. Loose running fit

B. Close running fit

C. Transition fit

D. Interference fit

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4

In which of the following machine, the work remains stationary and the tool is rotated?

A. Vertical boring machine

B. Horizontal boring machine

C. Precision boring machine

D. Jig boring machine

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4

The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

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4

The operation in which oil is permeated into the pores of a powder metallurgy product is known as

A. Mixing

B. Sintering

C. Impregnation

D. Infiltration

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4

Which of the following process is used for preparing parts having large curved surfaces and thin sections?

A. Hot machining

B. Ultrasonic machining

C. ECM process

D. Chemical milling

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4

Internal gear cutting operation can be performed by

A. Milling

B. Shaping with rack cutter

C. Shaping with pinion cutter

D. Hobbing

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4

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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The material which on machining produces chips with built up edge is

A. Brittle material

B. Tough material

C. Hard material

D. Ductile material

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In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

A. Fusion

B. Reverse polarity

C. Forward welding

D. Direct polarity

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4

Match the following metal forming processes with their associated stresses in the work piece.
Metal forming processTypes of stress
1. CoiningP. Tensile
2. Wire DrawingQ. Shear
3. BlankingR. Tensile and compressive
4. Deep DrawingS. Compressive

A. 1-S, 2-P, 3-Q, 4-R

B. 1-S, 2-P, 3-R, 4-Q

C. 1-P, 2-Q, 3-S, 4-R

D. 1-P, 2-R, 3-Q, 4-S

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4

If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

A. 0.20

B. 0.30

C. 0.50

D. 0.60

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4

EDM machining is applied for

A. Shaping carbide dies and punches having complicated profiles

B. Making large number of small holes in sieves and fuel nozzles

C. Embossing and engraving on harder materials

D. All of these

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4

It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?

A. Sensitive drilling machine

B. Radial drilling machine

C. Gang drilling machine

D. Multiple spindle drilling machine

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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

The broaching operation in which the work moves past the stationary tool is called

A. Pull broaching

B. Push broaching

C. Surface broaching

D. Continuous broaching

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4

If the helix angle of the drill is made _________ 30°, then the torque required to drive the drill at a given feed will be more.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The process of removing metal by a cutter which is rotated in the same direction of travel of workpiece, is called

A. Up milling

B. Down milling

C. Face milling

D. End milling

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The thrust force will increase with the increase in

A. Side cutting edge angle

B. Tool nose radius

C. Rake angle

D. End cutting edge angle