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Current Affairs January 2024

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4

The tool life is said to be over if

A. Poor surface finish is obtained

B. There is sudden increase in cutting forces and power consumption

C. Overheating and fuming due to heat of friction starts

D. All of the above

Correct Answer :

D. All of the above


Related Questions

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The abrasive recommended for grinding materials of low tensile strength is

A. Silicon carbide

B. Aluminium oxide

C. Sand stone

D. Diamond

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Drilling is an example of

A. Orthogonal cutting

B. Oblique cutting

C. Simple cutting

D. Uniform cutting

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When the shear angle is large

A. Path of shear is short and chip is thin

B. Path of shear is large and chip is thick

C. Path of shear is short and chip is thick

D. Path of shear is large and chip is thin

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

A.

B. 10°

C. 20°

D. 100°

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Chemical milling operation is performed

A. On universal milling machine

B. On plain milling machine

C. In a tank containing an etching solution

D. Any one of these

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The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.

A. Mild steel

B. Copper

C. Aluminium

D. Brass

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4

Quality screw threads are produced by

A. Thread milling

B. Thread chasing

C. Thread cutting with single point tool

D. Thread casting

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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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When the cutting edge of the tool is dull, then during machining

A. Continuous chips are formed

B. Discontinuous chips are formed

C. Continuous chips with built-up edge are formed

D. No chips are formed

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4

The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called

A. Ceramic

B. Stellite

C. Diamond

D. Cemented carbide

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4

The size of a lathe is specified by the

A. Length between centres

B. Swing diameter over the bed

C. Swing diameter over the carriage

D. All of these

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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

Which of the following statement is correct about EDM machining?

A. It can machine hardest materials.

B. It produces high degree of surface finish.

C. The tool and work are never in contact with each other.

D. All of these

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4

A grinding wheel is said to be of _________ if it holds the abrasive grains more securely.

A. Soft grade

B. Medium grade

C. Hard grade

D. None of these

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A dense structure of a grinding wheel is used for

A. Hard materials

B. Brittle materials

C. Finishing cuts

D. All of these

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4

The chamfering is an essential operation after

A. Knurling

B. Rough turning

C. Boring

D. Thread cutting

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Which of the following operations can be performed with milling cutters?

A. Cutting key ways on shafts

B. Cutting external screw threads

C. Cutting teeth of spur gears

D. All of these

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Gear burnishing is a process for

A. Surface finishing

B. Undercut gears

C. Cycloidal gears

D. Removing residual stresses from teeth roots

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The angle between the lathe centres is

A. 30°

B. 45°

C. 60°

D. 90°

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If the flame of the welding torch is directed towards the progress of welding, then what will you call the welding technique?

A. Forehand welding

B. Flux cored ARC welding

C. Electro slag welding

D. Pulsed spray welding

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4

Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.

A. 2.17 rpm, 600 joules

B. 6.8 rpm, 6 joules

C. 5.03 rpm, 600 joules

D. 22 rpm, 600 joules

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The operation of smoothing and squaring the surface around a hole is known as

A. Counter-sinking

B. Counter-boring

C. Trepanning

D. Spot facing

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What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

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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

The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called

A. Helix or rake angle

B. Point angle

C. Chisel edge angle

D. Lip clearance angle

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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 in-feed grinding is used to

A. Produce tapers

B. Grind shoulders and formed surfaces

C. Grind long, slender shafts or bars

D. All of these

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4

The average cutting speed for turning brass with a high speed steel tool is

A. 15 to 19 m/min

B. 25 to 31 m/min

C. 60 to 90 m/min

D. 90 to 120 m/min

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4

Volume of a cube of side l and volume of a sphere of radius r are equal. Both the cube and the sphere are solid and of same material. They are being cast. The ratio of the solidification time of the cube to the same of the sphere is

A. (4π/6)³ × (r/l)⁶

B. (4π/6) × (r/l)²

C. (4π/6)² × (r/l)³

D. (4π/6)² × (r/l)⁴

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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