Production and Industrial Engineering
GATE PI topic:advanced-manufacturing PYQs
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How to practice topic:advanced-manufacturing
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Questions 1–10 of 19. Imported answers require independent review unless marked reviewed.
Question 42
Open questionPIMCQ2 marksNeeds review
Which ONE of the following options CORRECTLY matches the machining process and associated predominant material removal mechanism?
Advanced machining process | Predominant material removal mechanism |
|---|---|
P. Laser beam machining | 1. Impact based erosion |
Q. Abrasive waterjet machining | 2. Sputtering |
R. Ion beam machining | 3. Melting and vaporization |
S. Mechanical milling | 4. Shearing |
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionPINAT2 marksNeeds review
In laser beam machining, the time (
) required for the material to attain the melting temperature from a room temperature (
) of 32 °C is expressed by the following expression,
where
is thermal diffusivity,
is melting temperature,
is thermal conductivity,
is heat flux.If a uniformly distributed 1 kW power laser beam with a beam diameter of 0.1 mm is used for machining tungsten carbide, and 10% of beam absorption is assumed, the time
is _____ μs (rounded off to one decimal place).Note: Thermal properties of tungsten carbide: melting temperature = 3400 °C; thermal conductivity = 2.15 Wcm⁻¹°C⁻¹; diffusivity = 0.79 cm²s⁻¹; assume
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 22
Open questionPIMCQ1 markNeeds review
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?
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 38
Open questionPIMCQ2 marksNeeds review
Match the following with reference to the machining process and its feature.
Process | Feature |
|---|---|
P — EDM | 1 — Loss of dimensional accuracy due to under cutting |
Q — LBM | 2 — Cutting ed(e) items |
R — CHM | 3 — Machining of a deep square blind hole on a mild steel plate |
S — WJM | 4 — High speed profile cutting on a thin mild steel plate |
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 59
Open questionPINAT2 marksNeeds review
Electro-chemical machining is performed on a flat copper workpiece. If the material removal rate is 2 cm
/min throughout the process, then the required current (in A) is ________. (Rounded off to 1 decimal place)Copper properties: Melting point = 1085 °C, density = 9 g/cm
, gram atomic weight = 63, and valency of dissolution = 2Faraday’s constant = 96500 C
Stefan-Boltzmann constant = 5.67 × 10
W·m
·K
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Vacuum in the machining zone is an essential requirement for
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A CNC water jet cutting machine is used to cut a straight slot between the points (2, 1) and (10, 10) on the XY plane (dimensions are in mm). If the feed rate is 1.5 mm/s, the time, in s, required to machine the slot following the shortest path, is _____ (round off to 2 decimal places).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 17
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In an electro-discharge machining process, the discharge voltage is
. The energy dissipated per spark across the inter-electrode gap is proportional toYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionPINAT2 marksNeeds review
For an electrochemical machining process
where
is the inter-electrode gap in mm at time
in minute, and
is the feed of the tool in mm/minute. The value of λ is 6×10⁻³ cm²/minute. For maintaining a constant inter-electrode gap of 0.1 mm, the feed (in mm/minute) should be____________. [round off to one decimal place]Log in to check the answer
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Open questionPIMCQ1 markNeeds review
The frequency of pulsing in a die-sinking electric discharge machine (EDM) is 10 kHz. The pulse off-time is set at 40 micro-seconds. The duty factor at this setting is
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