GATE PI Machining PYQs & Answers

Questions 1–10 of 34. Imported answers require independent review unless marked reviewed.

A modified Taylor tool life equation is given as follows:

where

is the cutting speed (m/s),

is the tool life in minutes and

is the feed in mm/rev,

and

. Under two different cutting conditions

and

the tool life

was found to be the same.

If the ratio of the cutting speeds

used is 2/3, then the ratio of corresponding feeds

must be _____ (rounded off to two decimal places).

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In the theory of orthogonal machining, assuming that the shear plane will take up an angle that minimizes energy, the shear angle can be shown to be

where

is the shear angle,

the rake angle, and

the friction angle.

Which ONE or MORE among the following is/are TRUE?

Your answerSelect all correct options. You can choose more than one.

is constant if the shear stress on the shear plane is independent of the normal stress.

is constant if the shear stress on the shear plane is dependent on the normal stress.

depends on material properties if the shear stress on the shear plane is independent of the normal stress.

depends on material properties if the shear stress on the shear plane is linearly dependent on the normal stress.

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Which ONE or MORE among the following work materials is/are NOT commonly machined using diamond cutting tools?

Your answerSelect all correct options. You can choose more than one.

Mild steel

Stainless steel

Silicon

Aluminium alloy

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A through hole of 8 mm diameter is to be drilled in a 30 mm thick mild steel plate. Which one of the following processes is the most appropriate to achieve high dimensional accuracy with less processing time?

Your answerChoose one option.

Conventional drilling using a carbide drill bit

Die sinking EDM using a copper electrode

ECM using a copper electrode

Plasma arc machining

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In an orthogonal straight turning process, the feed is 0.1 mm/rev and the depth of cut is 0.5 mm. In ASA system, the side cutting edge angle of the cutting tool is 0°. The width (in mm) of the chip is________. (Rounded off to one decimal place)

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Match the operation/phenomenon in a grinding process with the corresponding definition listed in the table.

Operation/phenomenon	Definition
P — Loading	1 — Regenerating the sharpness of the grinding wheel
Q — Glazing	2 — Filling of grinding chips in the space between the abrasive grits
R — Dressing	3 — Restoring the geometry/shape of the grinding wheel
S — Truing	4 — Condition of dull grinding wheel with worn-out grains

Your answerChoose one option.

P – 4, Q – 1, R – 3, S – 2

P – 2, Q – 3, R – 1, S – 4

P – 2, Q – 4, R – 1, S – 3

P – 4, Q – 3, R – 1, S – 2

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A through hole of 10 mm diameter is to be drilled in a mild steel plate of 30 mm thickness. The selected spindle speed and feed for drilling hole are 600 revolutions per minute (RPM) and 0.3 mm/rev, respectively. Take initial approach and breakthrough distances as 3 mm each. The total time (in minute) for drilling one hole is________. (Rounded off to two decimal places)

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During orthogonal cutting with a tool of 10° rake angle, the cutting and thrust forces are 900 N and 275 N, respectively. The coefficient of friction on the rake surface of the tool is________. (Rounded off to two decimal places)

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Choose the item(s) which is/are required to make an eccentric hole on a disc, as shown, using a lathe.

Diagram for Production and Industrial Engineering question 43

Your answerSelect all correct options. You can choose more than one.

Single point cutting tool

Four jaw chuck

Drill bit

Three jaw chuck

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The following data are given in relation to turning operation of a cylindrical workpiece.

Diameter of the workpiece = 160 mm, length of the workpiece = 190 mm, cutting velocity =

m/min, and tool feed = 0.2 mm/rev.

Assuming the approach and the overrun of the tool to be 5 mm each, the machining time (in minutes) is ________. (Answer in integer)

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GATE PI Machining PYQs

How to practice Machining

Question 33

Question 47

Question 51

Question 22

Question 30

Question 39

Question 50

Question 52

Question 43

Question 55