Home
Current Affairs January 2024

What is the correct answer?

4

The hardness of a grinding wheel is specified by

A. Brinell hardness number

B. Rockwell hardness number

C. Vickers pyramid number

D. Letter of alphabet

Correct Answer :

D. Letter of alphabet


Related Questions

What is the correct answer?

4

A process of removing metal by pushing or pulling a cutting tool is called

A. Up milling

B. Down milling

C. Forming

D. Broaching

What is the correct answer?

4

The abrasive recommended for grinding materials of low tensile strength is

A. Silicon carbide

B. Aluminium oxide

C. Sand stone

D. Diamond

What is the correct answer?

4

When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as

A. Electrochemical machining

B. Electro-discharge machining

C. Ultrasonic machining

D. None of these

What is the correct answer?

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

What is the correct answer?

4

In order to have interference fit, it is essential that the lower limit of the shaft should be

A. Greater than the upper limit of the hole

B. Lesser than the upper limit of the hole

C. Greater than the lower limit of the hole

D. Lesser than the lower limit of the hole

What is the correct answer?

4

A better machinable metal is one which gives

A. Lower chip-tool contact area and larger shear angle

B. Higher chip-tool contact area and smaller shear angle

C. Lower chip-tool contact area and smaller shear angle

D. Higher chip-tool contact area and larger shear angle

What is the correct answer?

4

Calculate the weld per minute, 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.

A. 3000 welds / min, 75 mm / min

B. 600 welds / min, 1500 mm / min

C. 500 welds/ min, 1250 mm/min

D. 22 welds / min, 55 mm / min

What is the correct answer?

4

A tool used to withdraw a drill from the sleeve is called

A. Drill remover

B. Drill puller

C. Drift

D. Drill drawer

What is the correct answer?

4

The structure of a grinding wheel depends upon

A. Hardness of the material being ground

B. Nature of the grinding operation

C. Finish required

D. All of these

What is the correct answer?

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

What is the correct answer?

4

When the tool moves parallel to the lathe axis, the movement is termed as

A. Cross feed

B. Angular feed

C. Longitudinal feed

D. Any one of these

What is the correct answer?

4

The high cutting speed and large rake angle of the tool will result in the formation of

A. Continuous chips

B. Discontinuous chip

C. Continuous chips with built up edge

D. None of these

What is the correct answer?

4

The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is

A. Feed rate, depth of cut, cutting speed

B. Depth of cut, cutting speed, feed rate

C. Cutting speed, feed rate, depth of cut

D. Feed rate, cutting speed, depth of cut

What is the correct answer?

4

In drilling operation, the metal is removed by

A. Shearing

B. Extrusion

C. Shearing and extrusion

D. Shearing and compression

What is the correct answer?

4

In machining metals, surface roughness is due to

A. Feed marks or ridges left by the cutting tool

B. Fragment of built-up edge on the machined surface

C. Cutting tool vibrations

D. All of these

What is the correct answer?

4

The different spindle speeds on a lathe form

A. Arithmetical progression

B. Geometrical progression

C. Harmonical progression

D. Any one of these

What is the correct answer?

4

The tap used to cut threads in a blind hole is

A. Taper tap

B. Second tap

C. Bottoming tap

D. Any one of these

What is the correct answer?

4

In centreless grinders, the regulating wheel is inclined at

A. 0° to 8°

B. 9° to 15°

C. 16° to 20°

D. 21° to 25°

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

In machining metal, cutting force at the cutting edge is measured by a

A. Wattmeter

B. Dynamometer

C. Hydrometer

D. Pyrometer

What is the correct answer?

4

The advantage of a broaching operation is that

A. Rate of production is very high

B. High accuracy and high class of surface finish is possible

C. Roughing and finishing cuts are completed in one pass of the tool

D. All of the above

What is the correct answer?

4

Larger end cutting edge angle _________ tool life.

A. Increases

B. Decreases

C. Does not effect

D. None of these

What is the correct answer?

4

Cast iron during machining produces

A. Continuous chips

B. Discontinuous chips

C. Continuous chips with built-up edge

D. None of these

What is the correct answer?

4

Carbide tipped tools usually have

A. Negative rake angle

B. Positive rake angle

C. Any rake angle

D. No rake angle

What is the correct answer?

4

The process of improving the cutting action of the grinding wheel is called

A. Truing

B. Dressing

C. Facing

D. Clearing

What is the correct answer?

4

In a gating system, the ratio 1: 2: 4 represents

A. Sprue base area: runner area: ingate area

B. Pouring basin area: ingate area: runner area

C. Sprue base area: ingate area: casting area

D. Runner area: ingate area: casting area

What is the correct answer?

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

What is the correct answer?

4

In metal cutting, use of low feeds and high cutting speeds is desired when the objective is

A. High metal removal rate

B. Dry machining

C. Use of soft cutting tool

D. Surface finish

What is the correct answer?

4

Trepanning is an operation of

A. Making a cone-shaped enlargement of the end of a hole

B. Smoothing and squaring the surface around a hole

C. Sizing and finishing a small diameter hole

D. Producing a hole by removing metal along the circumference of a hollow cutting tool