Most answered questions in Materials, Manufacturing and Industrial Engineering / GO Mechanical

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GATE2019 ME-1: 54
Five jobs $(J1, J2, J3, J4$ and $J5)$ need to be processes in a factory. Each job can be assigned to any of the five different machines $(M1, M2, M3, M4$ and $M5)$. The time durations taken (in minutes) by the machines for each of the jobs, are given in the table. ...

Five jobs $(J1, J2, J3, J4$ and $J5)$ need to be processes in a factory. Each job can be assigned to any of the five different machines $(M1, M2, M3, M4$ and $M5)$. The t...

Arjun

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Arjun asked Feb 9, 2019

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GATE2019 ME-1: 55
A project consists of six activities. The immediate predecessor of each activity and the estimated duration is also provided in the table below: ... amount of time, the maximum duration (in weeks) of the activity $S$ without delaying the completion of the project is ________

A project consists of six activities. The immediate predecessor of each activity and the estimated duration is also provided in the table below:$\begin{array}{|c|c|c|} \h...

Arjun

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Arjun asked Feb 9, 2019

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GATE ME 2012 | Question: 39
In a DC arc welding operation, the voltage-arc length characteristic was obtained as $V_{arc} = 20+5l$ where the arc length $l$ was varied between $5$ mm and $7$ mm. Here $V_{arc}$ denotes the arc voltage in $Volts$. The arc current was varied from $400$ A and $500$ A. ... for the welding operation are $45$ V, $450$ A $75$ V, $750$ A $95$ V, $950$ A $150$ V, $1500$ A

In a DC arc welding operation, the voltage-arc length characteristic was obtained as $V_{arc} = 20+5l$ where the arc length $l$ was varied between $5$ mm and $7$ mm. Here...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 38
In a single pass rolling process using $410$ mm diameter steel rollers, a strip of width $140$ mm and thickness $8$ mm undergoes $10\%$ reduction of thickness. The angle of bite in radians is $0.006$ $0.031$ $0.062$ $0.600$

In a single pass rolling process using $410$ mm diameter steel rollers, a strip of width $140$ mm and thickness $8$ mm undergoes $10\%$ reduction of thickness. The angle ...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 37
Calculate the punch size in mm, for a circular blanking operation for which details are given below. ... $24.83$ $24.89$ $25.01$ $25.17$

Calculate the punch size in mm, for a circular blanking operation for which details are given below.$\begin{array}{ll} \text{Size of the blank} & 25 \text{ mm} \\ \text{T...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 28
In a single pass drilling operation, a through hole of $15$ mm diameter is to be drilled in a steel plate of $50$ mm thickness. Drill spindle speed is $500$ rpm, feed is $0.2$ mm/rev and drill point angle is $118^{\circ}$. Assuming $2$ mm clearance at approach and exit, the total drill time (in seconds) is $35.1$ $32.4$ $31.2$ $30.1$

In a single pass drilling operation, a through hole of $15$ mm diameter is to be drilled in a steel plate of $50$ mm thickness. Drill spindle speed is $500$ rpm, feed is ...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 27
Details pertaining to an orthogonal mental cutting process are given below. ... during the process is $0.1781 \times 10^5$ $0.7754 \times 10^5$ $1.0104 \times 10^5$ $4.397 \times 10^5$

Details pertaining to an orthogonal mental cutting process are given below.$\begin{array}{ll} \text{Chip thickness ratio} & 0.4 \\ \text{Undeformed thickness} & 0.6 \text...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 26
The homogeneous state of stress for a metal part undergoing plastic deformation is $T = \begin{pmatrix} 10 & 5 & 0 \\ 5 & 20 & 0 \\ 0 & 0 & -10 \end{pmatrix}$ where the stress component values are in MPa. Using von Mises yield criterion, the value of estimated shear yield stress, in MPa is 9.50 16.07 28.52 49.41

The homogeneous state of stress for a metal part undergoing plastic deformation is $$T = \begin{pmatrix} 10 & 5 & 0 \\ 5 & 20 & 0 \\ 0 & 0 & -10 \end{pmatrix}$$ where the...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 16
A solid cylinder of diameter $100$ mm and height $50$ mm is forged between two frictionless flat dies to a height of $25$ mm. The percentage change in diameter is $0$ $2.07$ $20.7$ $41.4$

A solid cylinder of diameter $100$ mm and height $50$ mm is forged between two frictionless flat dies to a height of $25$ mm. The percentage change in diameter is$0$$2.07...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 15
A CNC vertical milling machine has to cut a straight slot of $10$ mm width and $2$ mm 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 $120$ $170$ $180$ $240$

A CNC vertical milling machine has to cut a straight slot of $10$ mm width and $2$ mm depth by a cutter of $10$ mm diameter between points $(0,0)$ and $(100,100)$ on the ...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 13
Which one of the following is NOT a decision taken during the aggregate production planning stage? Scheduling of machines Amount of labour to be committed Rate at which production should happen Inventory to be carried forward

Which one of the following is NOT a decision taken during the aggregate production planning stage?Scheduling of machinesAmount of labour to be committedRate at which prod...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE ME 2012 | Question: 3
In an interchangeable assembly, shafts of size $25.000^{+0.040 \\ -0.010} \: mm$ mate with holes of size $25.000^{+0.030 \\ +0.020} \: mm$. The maximum interface (in microns) in the assembly is $40$ $30$ $20$ $10$

In an interchangeable assembly, shafts of size $25.000^{+0.040 \\ -0.010} \: mm$ mate with holes of size $25.000^{+0.030 \\ +0.020} \: mm$. The maximum interface (in micr...

Andrijana3306

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Andrijana3306 asked Mar 19, 2018

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GATE2018-2-53
A welding operation is being performed with voltage $= 30 \: V$ and current =$100 \: A$. The cross-sectional area of the weld bead is $20 \: mm^2$. The work-piece and filler are titanium for which the specific energy of melting is $14 \: J/mm^3$. Assuming a thermal efficiency of the welding process $70 \%$, the welding speed (in $mm/s$) is __________ (correct to two decimal places).

A welding operation is being performed with voltage $= 30 \: V$ and current =$100 \: A$. The cross-sectional area of the weld bead is $20 \: mm^2$. The work-piece and fil...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-52
A circular hole of $25 \: mm$ diameter and depth of $20 \: mm$ is machined by EDM process. The material removal rate (in $mm^3/min$) is expressed as $ 4 \times 10^4 \: IT^{-1.23}$ where $I=300 \: A $ and the melting point of the material, $T=1600^{\circ}C$. The time ( in minutes) for machining this hole is _________ (correct to two decimal places)

A circular hole of $25 \: mm$ diameter and depth of $20 \: mm$ is machined by EDM process. The material removal rate (in $mm^3/min$) is expressed as $$ 4 \times 10^4 \: I...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-51
The arc lengths of a directed graph of a project are as shown in the figure. The shortest path length from node $1$ to node $6$ is __________

The arc lengths of a directed graph of a project are as shown in the figure. The shortest path length from node $1$ to node $6$ is __________

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-47
A steel wire is drawn from an initial diameter $(d_i$) of $10 \: mm$ to a final diameter ($d_f$) of the $7.5 \: mm$. The half cone angle ($\alpha$) of the die is $5^{\circ}$ and the coefficient of friction ($\mu$) between the die and the wire ... The drawing stress (in MPa) required to carry out this operation is _____ (correct to two decimal places)

A steel wire is drawn from an initial diameter $(d_i$) of $10 \: mm$ to a final diameter ($d_f$) of the $7.5 \: mm$. The half cone angle ($\alpha$) of the die is $5^{\cir...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-48
Following data correspond to an orthogonal turning of a $100 \: mm $ diameter rod on a lathe. Rake angle:$+15^{\circ}$; Uncut chip thickness: $0.5 mm$; nominal chip thickness after the cut: $1.25 \: mm$ The shear angle (in degrees) for this process is _________ (correct to two decimal places)

Following data correspond to an orthogonal turning of a $100 \: mm $ diameter rod on a lathe. Rake angle:$+15^{\circ}$; Uncut chip thickness: $0.5 mm$; nominal chip thick...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-50
For sand-casting a steel rectangular plate with dimensions $80 \: mm \times 120 \: mm \times 20 \: mm$, a cylindrical riser has to be designed. The height of the riser is equal to its diameter. The total solidification time for the casting in $2$ ... a solidification time for $3$ minutes in the riser, the diameter (in mm) of the riser is ________ (correct to two decimal places)

For sand-casting a steel rectangular plate with dimensions $80 \: mm \times 120 \: mm \times 20 \: mm$, a cylindrical riser has to be designed. The height of the riser is...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-49
Taylor's tool life equation is used to estimate the life of a batch of identical HSS twist drills by drilling through holes at constant feed in $20 \: mm$ thick mild steel plates. In test $1$, a drill lasted $300$ holes at $150$ rpm while in ... maximum number of holes that can be made by another drill from the above batch at $200$ rpm is_________ (correct to two decimal places).

Taylor's tool life equation is used to estimate the life of a batch of identical HSS twist drills by drilling through holes at constant feed in $20 \: mm$ thick mild stee...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-18
A local tyre distributor expects to sell approximately $9600$ steel belted radial tyres next year. Annual carrying cost is Rs. $16$ per tyre and ordering cost is Rs. $75$. The economic order quantity of the tyres is $64$ $212$ $300$ $1200$

A local tyre distributor expects to sell approximately $9600$ steel belted radial tyres next year. Annual carrying cost is Rs. $16$ per tyre and ordering cost is Rs. $75$...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-17
The preferred option for holding an odd-shaped workpiece in a centre lathe is live and dead centres three jaw chuck lathe dog four jaw chuck

The preferred option for holding an odd-shaped workpiece in a centre lathe islive and dead centresthree jaw chucklathe dogfour jaw chuck

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-16
Metal removal in electric discharge machining takes place through ion displacement melting and vaporization corrosive and reaction plastic shear

Metal removal in electric discharge machining takes place throughion displacementmelting and vaporizationcorrosive and reactionplastic shear

Arjun

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GATE2018-2-15
Feed rate in slab milling operation is equal to rotation per minute (rpm) product of rpm and number of teeth in the cutter product of rpm, feed per tooth and number of teeth in the cutter product of rpm, feed per tooth and number of teeth in contact

Feed rate in slab milling operation is equal torotation per minute (rpm)product of rpm and number of teeth in the cutterproduct of rpm, feed per tooth and number of teeth...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-14
Match the following products with the suitable manufacturing process: ... $P-2, Q-1, R-3, S-4$ $P-4, Q-1, R-2, S-3$ $P-1, Q-3, R-4, S-2$

Match the following products with the suitable manufacturing process:$\begin{array}{|l|l|l|l|} \hline & \textbf{Product} && \textbf{Manufacturing Process} \\ \hline P. & ...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-2-13
During solidification of a pure molten metal, the grains in the casting near the mould wall are coarse and randomly oriented fine and randomly oriented fine and ordered coarse and ordered

During solidification of a pure molten metal, the grains in the casting near the mould wall arecoarse and randomly orientedfine and randomly orientedfine and orderedcoars...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-55
An electrochemical machining (ECM) is to be used to cut a through hole into a $12$ mm thick aluminum plate. The hole has a rectangular cross-section. $10 \: mm \times 30 \:mm$. The ECM operation will be accomplished in $2$ minutes, with efficiency of $90 \%$. Assuming ... , the current (in A) required is __________ (correct to two decimal places).

An electrochemical machining (ECM) is to be used to cut a through hole into a $12$ mm thick aluminum plate. The hole has a rectangular cross-section. $10 \: mm \times 30 ...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-52
Processing times (including setup times) and due dates for six jobs waiting to be processed at a work centre are given in the table. The average tardiness (in days) using shortest processing time rule is __________ (correct to two decimal places). ...

Processing times (including setup times) and due dates for six jobs waiting to be processed at a work centre are given in the table. The average tardiness (in days) using...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-49
An orthogonal cutting operation is being carried out in which uncut thickness is $0.010$ mm, cutting speed is $130$ m/min, rake angle is $15^{\circ}$ and width of cut is $6$ mm. It is observed that the chip thickness is $0.015$ mm, the cutting force is $60$ N and the thrust force is $25$ N. The ratio of friction energy to total energy is _______ (correct to two decimal places).

An orthogonal cutting operation is being carried out in which uncut thickness is $0.010$ mm, cutting speed is $130$ m/min, rake angle is $15^{\circ}$ and width of cut is ...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-36
The percentage scrap in a sheet metal blanking operation of a continuous strip of sheet metal as shown in the figure is _______ (correct to two decimal places)

The percentage scrap in a sheet metal blanking operation of a continuous strip of sheet metal as shown in the figure is _______ (correct to two decimal places)

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-35
The maximum reduction in cross-sectional area per pass $(R)$ of a cold wire drawing process is $R=1-e^{-(n+1)}$, where $n$ represents the strain hardening coefficient. For the case of a perfectly plastic material, $R$ is $0.865$ $0.826$ $0.777$ $0.632$

The maximum reduction in cross-sectional area per pass $(R)$ of a cold wire drawing process is $R=1-e^{-(n+1)}$, where $n$ represents the strain hardening coefficient. Fo...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-25
The height (in mm) for a $125$ mm sine bar to measure a taper of $27^\circ \: 32'$ on a flat work piece is _____ (correct to three decimal palces).

The height (in mm) for a $125$ mm sine bar to measure a taper of $27^\circ \: 32'$ on a flat work piece is _____ (correct to three decimal palces).

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-14
A grinding ratio of $200$ implies that the grinding wheel wears $200$ times the volume of the material removed grinding wheel wears $0.005$ times the volume of the material removed aspect ratio of abrasive particles used in the grinding wheel is $200$ ratio of volume of abrasive particle to that of grinding wheel is $200$

A grinding ratio of $200$ implies that thegrinding wheel wears $200$ times the volume of the material removedgrinding wheel wears $0.005$ times the volume of the material...

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-12
The type of weld represented by the shaded region in the figure is groove spot fillet plug

The type of weld represented by the shaded region in the figure isgroovespotfilletplug

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-13
Using the Taylor's tool life equation with exponent $n=0.5$, if th cutting speed is reduced by $50$, the ratio of new tool life to original tool life is $4$ $2$ $1$ $0.5$

Using the Taylor's tool life equation with exponent $n=0.5$, if th cutting speed is reduced by $50$, the ratio of new tool life to original tool life is$4$$2$$1$$0.5$

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-15
Interpolator in a CNC machine controls spindle speed coordinates axes movements operates tool changer commands canned cycle

Interpolator in a CNC machinecontrols spindle speedcoordinates axes movementsoperates tool changercommands canned cycle

Arjun

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Arjun asked Feb 17, 2018

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GATE2018-1-16
The time series forecasting method that gives equal weightage to each of the $m$ most recent observations is Moving average method Exponential smoothing with linear trend Triple Exponential smoothing Kalman Filter

The time series forecasting method that gives equal weightage to each of the $m$ most recent observations isMoving average methodExponential smoothing with linear trendTr...

Arjun

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Arjun asked Feb 17, 2018

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GATE2017 ME-2: 53
A cylindrical pin of $25^{+0.020}_{+0.010}$ mm diameter is electroplated. Plating thickness is $2.0^{\pm0.005}$ mm. Neglecting the gauge tolerance, the diameter (in mm, up to $3$ decimal points accuracy) of the GO ring gauge to inspect the plated pin is __________.

A cylindrical pin of $25^{+0.020}_{+0.010}$ mm diameter is electroplated. Plating thickness is $2.0^{\pm0.005}$ mm. Neglecting the gauge tolerance, the diameter (in mm, u...

Arjun

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Arjun asked Feb 26, 2017

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GATE2017 ME-2: 48
A product made in two factories, $P$ and $Q$, is transported to two destinations, $R$ and $S$ ... the minimum) total transportation cost is $Y$ (in Rupees), then $(X-Y)$, in Rupees, is $0$ $15$ $35$ $105$

A product made in two factories, $P$ and $Q$, is transported to two destinations, $R$ and $S$. The per unit costs of transportation (in Rupees) from factories to destinat...

Arjun

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Arjun asked Feb 26, 2017

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GATE2017 ME-2: 52
A strip of $120$ mm width and $8$ mm thickness is rolled between two $300$ mm-diameter rolls to get a strip of $120$ mm width and $7.2$ mm thickness. The speed of the strip at the exit is $30$ m/min. There is no front or back tension. ... $100\%$ mechanical efficiency, the minimum total power (in $kW$) required to drive the two rolls is _______.

A strip of $120$ mm width and $8$ mm thickness is rolled between two $300$ mm-diameter rolls to get a strip of $120$ mm width and $7.2$ mm thickness. The speed of the str...

Arjun

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Arjun asked Feb 26, 2017

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GATE2017 ME-2: 49
A project starts with activity $A$ and ends with activity $F$ ... The minimum project completion time (in days) is _________.

A project starts with activity $A$ and ends with activity $F$. The precedence relation and durations of the activities are as per the following table:$$\begin{array}{|l|l...

Arjun

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Arjun asked Feb 26, 2017