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4

The tool life in case of a grinding wheel is the time

A. Between two successive regrinds of the wheel

B. Taken for the wheel to be balanced

C. Taken between two successive wheel dressings

D. Taken for a wear of 1 mm on its diameter

Correct Answer :

C. Taken between two successive wheel dressings


Related Questions

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4

The rear teeth of a broach

A. Perform burnishing operation

B. Remove minimum metal

C. Remove maximum metal

D. Remove no metal

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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

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4

In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called

A. Face

B. Fillet

C. Gash

D. Land

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4

The binding material used in cemented carbide tools is

A. Tungsten

B. Chromium

C. Silicon

D. Cobalt

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4

A shaft has a dimension, φ9 +0.025⁺⁰⁰⁰⁹, the respective values of fundamental deviation and tolerance are

A. - 0.025, ±0.008

B. - 0.025, 0.016

C. - 0.009, ± 0.008

D. - 0.009, 0.016

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4

The method of centre less grinding used to produce taper is

A. In-feed grinding

B. Through feed grinding

C. End feed grinding

D. Any one of these

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4

The lathe centres 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

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 tool material, for faster machining, should have

A. Wear resistance

B. Red hardness

C. Toughness

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

In electrochemical machining, the gap between the tool and work is kept as

A. 0.1 mm

B. 0.4 mm

C. 0.35

D. 0.75 mm

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4

The cutting speed for counter-boring should be _________ that of drilling operation.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

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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4

Stellite preserves hardness upto a temperature of

A. 350°C

B. 500°C

C. 900°C

D. 1100°C

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4

Carbide tipped tools usually have

A. Negative rake angle

B. Positive rake angle

C. Any rake angle

D. No rake angle

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4

The cutting angle of a flat drill varies from

A. 3° to 8°

B. 20° to 30°

C. 60° to 90°

D. 90° to 120°

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4

A lead-screw with half nuts in a lathe, free to rotate in both directions has

A. V-threads

B. Whitworth threads

C. Buttress threads

D. Acme threads

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4

A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is

A. 120

B. 170

C. 180

D. 240

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4

The hard grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P

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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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4

An important geometrical quantity in the cutting of metals which can be used as a criterion for machinability of metals is

A. Cutting speed

B. Feed rate

C. Shear angle

D. Tool geometry

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4

The type of reamer used for reaming operation in a blind hole, is

A. Straight fluted reamer

B. Left hand spiral fluted reamer

C. Right hand spiral fluted reamer

D. Any one of these

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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 operation of producing grooves around the periphery of a cylindrical or conical workpiece is called

A. Profile milling

B. Gang milling

C. Saw milling

D. Helical milling

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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

Which of the following statement is correct about nose radius?

A. It improves tool life

B. It improves the surface finish

C. Both (A) and (B)

D. None 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

The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)

A. VnT = C

B. VTn = C

C. Vn/T = C

D. V/Tn = C

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4

The height of each tooth of a broach is

A. Same throughout

B. In progressively decreasing order

C. In progressively increasing order

D. None of these

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4

The saw milling is an operation of

A. Producing grooves around the periphery of a cylindrical or conical workpiece

B. Producing narrow slots or grooves on a workpiece

C. Reproduction of an outline of a template on a workpiece

D. Machining several surfaces of a workpiece simultaneously