Production and Industrial Engineering
GATE PI topic:manufacturing PYQs
Build your understanding with focused practice from past exam papers.
Questions 511–520 of 650. Imported answers require independent review unless marked reviewed.
Question 46
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During a storm, the wind speed is 90 km/hr. In a high-rise building, there is a window of size 1.2 m × 1.8 m facing the storm on an upper floor. Neglecting the ground effects on wind speed and considering the density of air
, the force (in N) acting on the window due to the storm is ______Log in to check the answer
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The heat transfer efficiency in arc welding of a plate using a current of 250 A at 20 V is 90%. The heat required to melt the material is 10 J/mm³. If the cross-sectional area of the weld joint is 30 mm² and the travel speed is 5 mm/s, the melting efficiency (in %) is ______ (round off to 2 decimal places)
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A sand casting process has a mold constant of 2 s/mm² and solidification exponent of 2. If the solidification time is to be doubled for a given unit volume of material, the corresponding reduction in the cast surface area (in %) is ______
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During a turning operation of a specific work material having shear strength of 220 MPa under orthogonal cutting condition, the process parameters are:
Parameter | Value |
|---|---|
Feed | 0.2 mm/rev |
Depth of cut | 1 mm |
Rake angle | −5° |
Given chip thickness ratio as 0.5, friction angle as 49.2° and shear angle as 25.4°, the feed force (in N) is ______
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A CO₂ laser in continuous mode is used for drilling a plate. The process parameters and their values are:
Parameter | Value |
|---|---|
Laser power intensity | W/mm² |
Vaporization energy | J/mm³ |
Efficiency of the process | 15% |
Laser spot diameter | 200 micrometer |
The drilled depth (in mm) after 2 seconds is ______
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A process which is in a state of statistical control (within ±3σ) has an estimate of standard deviation (σ) 2 mm. The specification limits for the corresponding product are 120 ± 8 mm. When process mean shifts from 118 mm to 122 mm with no change in process standard deviation, the difference in process capability index
is ______Log in to check the answer
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A monitoring system has seven components. The reliability of each component is shown in the figure. The system reliability is ______ (round off to 2 decimal places)
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A PERT project network consists of 5 activities A to E. The time estimates of these activities follow Beta-distribution. The predecessor–successor (P-S) relationships between the nodes and time estimates of activities are given in table.
Activity | P-S | Optimistic time (days) | Most likely time (days) | Pessimistic time (days) |
|---|---|---|---|---|
A | 1–2 | 2 | 4 | 6 |
B | 2–3 | 4 | 5 | 12 |
C | 2–4 | 5 | 8 | 11 |
D | 3–5 | 2 | 5 | 08 |
E | 4–5 | 4 | 6 | 14 |
The variance (in days) of the critical path is ______ (round off to 2 decimal places)
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The sales data of a product for 5 years are:
Year | 2014 | 2015 | 2016 | 2017 | 2018 |
|---|---|---|---|---|---|
Sales (units) | 280 | 268 | 259 | 270 | 287 |
Assume the forecast for the year 2014 as 260 units. Using an exponential smoothing method with smoothing constant α = 0.5, the sales forecast (units) for the year 2019, is ______
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The layout for an AGV system is shown in figure. The loading time is 0.5 minutes and the unloading time is also 0.5 minutes. All distances are in meters.
Considering a vehicle velocity of 50 m/min, availability of 0.95 and traffic factor of 0.9, the number of vehicles required to satisfy a demand of 50 delivery/hour is ______
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