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

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GATE2019 ME-1: 14
Which one of the following welding methods provides the highest heat flux $(W/mm^2)$? Oxy-acetylene gas welding Tungsten inert gas welding Plasma arc welding Laser beam welding

Which one of the following welding methods provides the highest heat flux $(W/mm^2)$?Oxy-acetylene gas weldingTungsten inert gas weldingPlasma arc weldingLaser beam weldi...

Arjun

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GATE2015-2-49
In a two-stage wire drawing operation, the fractional reduction (ratio of change in cross-sectional area to initial cross-sectional area) in the first stage is $0.4$. The fractional reduction in the second stage is $0.3$. The overall fractional reduction is $0.24$ $0.58$ $0.60$ $1.00$

In a two-stage wire drawing operation, the fractional reduction (ratio of change in cross-sectional area to initial cross-sectional area) in the first stage is $0.4$. The...

Arjun

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Arjun asked Feb 24, 2017

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GATE Mechanical 2014 Set 3 | Question: 54
Which pair of following statements is correct for orthogonal cutting using a single-point cutting tool? P. Reduction in friction angle increases cutting force Q. Reduction in friction angle decreases cutting force R. Reduction in friction angle increases chip thickness S. Reduction in friction angle decreases chip thickness P and R P and S Q and R Q and S

Which pair of following statements is correct for orthogonal cutting using a single-point cuttingtool?P. Reduction in friction angle increases cutting forceQ. Reduction i...

Arjun

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Arjun asked Feb 19, 2017

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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...

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GATE2019 ME-2: 54
In an orthogonal machining with a single point cutting tool of rake angle $10^{\circ}$, the uncut chip thickness and the chip thickness are $0.125$ mm and $0.22$ mm, respectively. Using Merchant’s first solution for the condition of minimum cutting force, the coefficient of friction at the chip-tool interface is _______ (round off to two decimal places).

In an orthogonal machining with a single point cutting tool of rake angle $10^{\circ}$, the uncut chip thickness and the chip thickness are $0.125$ mm and $0.22$ mm, resp...

Arjun

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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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GATE2020-ME-1: 48
$\textbf{Consider two cases as below.}$ $\textbf{Case 1:}$ A company buys $1000$ pieces per year of a certain part from vendor $'X'.$ The changeover time is $2$ hours and the price is $Rs.\: 10$ per piece. The holding cost rate per part is $10\%$ ... reduction in the annual cost of $\text{Case 2}$, as compared to $\text{Case 1}$ is __________ (round off to $2$ decimal places).

$\textbf{Consider two cases as below.}$$\textbf{Case 1:}$ A company buys $1000$ pieces per year of a certain part from vendor $’X’.$The changeover time is $2$ hours a...

go_editor

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go_editor asked Feb 19, 2020

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GATE2019 ME-1: 13
In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mold cavity is called blister sprue riser pin hole

In a casting process, a vertical channel through which molten metal flows downward from pouring basin to runner for reaching the mold cavity is calledblistersprueriserpin...

Arjun

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Arjun asked Feb 9, 2019

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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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GATE Mechanical 2014 Set 1 | Question: 51
A metal rod of initial length $L_0$ is subjected to a drawing process. The length of the rod at any instant is given by the expression, $L(t)=L_0(1+t^2)$ , where $t$ is the time in minutes. The true strain rate (in $min^{−1}$) at the end of one minute is _______

A metal rod of initial length $L_0$ is subjected to a drawing process. The length of the rod at any instant is given by the expression, $L(t)=L_0(1+t^2)$ , where $t$ is t...

Arjun

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GATE Mechanical 2014 Set 3 | Question: 52
A cylindrical blind riser with diameter d and height h , is placed on the top of the mold cavity of a closed type san d mold as shown in the figure. If the riser is of constant volume, then the rate of solidification in the riser is the least when the ratio h:d is $1:2$ $2:1$ $1:4$ $4:1$

A cylindrical blind riser with diameter d and height h , is placed on the top of the mold cavity of a closed type san d mold as shown in the figure. If the riser is of co...

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GATE Mechanical 2014 Set 1 | Question: 22
The major difficulty during welding of aluminum is due to its high tendency of oxidation high thermal conductivity low melting point low density

The major difficulty during welding of aluminum is due to itshigh tendency of oxidationhigh thermal conductivitylow melting pointlow density

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GATE2020-ME-1: 44
A steel part with surface area of $125\:cm^{2}$ is to be chrome coated through an electroplating process using chromium acid sulphate as an electrolyte. An increasing current is applied to the part according to the following current time relation: $I=12+0.2t$ ... $\mu m$ (round off to one decimal place).

A steel part with surface area of $125\:cm^{2}$ is to be chrome coated through an electroplating process using chromium acid sulphate as an electrolyte. An increasing cur...

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GATE2019 ME-1: 35
In orthogonal turning of a cylindrical tube of wall thickness $5 \: mm$, the axial and the tangential cutting forces were measured as $1259 \: N$ and $1601 \:N$, respectively. The measured chip thickness after machining was found to be $0.3 \: mm$. The rake angle was ... solution, the shear strength of the material is closest to $722 \: MPa$ $920 \: MPa$ $200 \: MPa$ $875 \: MPa$

In orthogonal turning of a cylindrical tube of wall thickness $5 \: mm$, the axial and the tangential cutting forces were measured as $1259 \: N$ and $1601 \:N$, respecti...

Arjun

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Arjun asked Feb 9, 2019

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GATE Mechanical 2014 Set 4 | Question: 23
Better surface finish is obtained with a large rake angle because the area of shear plane decreases resulting in the decrease in shear force and cutting force the tool becomes thinner and the cutting force is reduced less heat is accumulated in the cutting zone the friction between the chip and the tool is less

Better surface finish is obtained with a large rake angle becausethe area of shear plane decreases resulting in the decrease in shear force and cutting forcethe tool beco...

Arjun

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Arjun asked Feb 19, 2017

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GATE2020-ME-1: 23
A company is hiring to fill four managerial vacancies. The candidates are five men and three women. If every candidate is equally likely to be chosen then the probability that at least one woman will be selected is _______(round off to $2$ decimal places).

A company is hiring to fill four managerial vacancies. The candidates are five men and three women. If every candidate is equally likely to be chosen then the probability...

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go_editor asked Feb 19, 2020

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GATE Mechanical 2014 Set 1 | Question: 13
The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is called Entropy Enthalpy Exergy Rothalpy

The maximum theoretical work obtainable, when a system interacts to equilibrium with a reference environment, is calledEntropyEnthalpyExergyRothalpy

Arjun

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GATE Mechanical 2014 Set 2 | Question: 41
A spherical balloon with a diameter of $10 m$, shown in the figure below is used for advertisements. The balloon is filled with helium ($R_{He}$ = $2.08 \: kJ/kg.K$) at ambient conditions of $15^\circ C$ and $100 kPa$. Assuming no ... ) of balloon material and rope required to avoid the fall of the balloon ($R_{air} = 0.289$ $kJ/kg.K$) is _______

A spherical balloon with a diameter of $10 m$, shown in the figure below is used for advertisements. The balloon is filled with helium ($R_{He}$ = $2.08 \: kJ/kg.K$) at a...

Arjun

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GATE2019 ME-1: 53
Taylor’s tool life equation is given by $VT^n=C$, where $V$ is in $m/min$ and $T$ is in $min$. In a turning operation, two tools $X$ and $Y$ are used. For tool $X$, $n=0.3$ and $C=60$ and for tool $Y$, $n=0.6$ and $C=90$. Both the tools will have the same tool life for the cutting speed (in $m/min$, round off to one decimal place) of ____________

Taylor’s tool life equation is given by $VT^n=C$, where $V$ is in $m/min$ and $T$ is in $min$. In a turning operation, two tools $X$ and $Y$ are used. For tool $X$, $n=...

Arjun

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Arjun asked Feb 9, 2019

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GATE2019 ME-1: 52
In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are $45^{\circ}$ and $10^{\circ}$, respectively. The feed during cylindrical turning is $0.1 \: mm/rev$. The center line average surface roughness (in $\mu m$, round off to one decimal place) of the generated surface is __________

In ASA system, the side cutting and end cutting edge angles of a sharp turning tool are $45^{\circ}$ and $10^{\circ}$, respectively. The feed during cylindrical turning i...

Arjun

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GATE2019 ME-2: 25
In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is $200$ V and the capacitance of the RC circuit is $50 \mu F$. The energy (in $J$) released per spark across the IEG is _________

In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is $200$ V and the capacitance of the RC circuit is $50 \mu F$. The e...

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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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GATE2019 ME-2: 14
Hardenability of steel is a measure of the ability to harden when it is cold worked the maximum hardness that can be obtained when it is austenitized and then quenched the depth to which required hardening is obtained when it is austenitized and then quenched the ability to retain its hardness when it is heated to elevated temperatures

Hardenability of steel is a measure ofthe ability to harden when it is cold workedthe maximum hardness that can be obtained when it is austenitized and then quenchedthe d...

Arjun

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GATE2019 ME-1: 37
Match the following sand mold casting defects with their respective causes. ... $P-3, Q-4, R-2, S-1$ $P-2, Q-4, R-1, S-3$ $P-3, Q-4, R-1, S-2$

Match the following sand mold casting defects with their respective causes.$\begin{array}{|l|l|l|l|} \hline \\ {} & \text{Defect} & {} & \text{Cause} \\ \hline P & \text{...

Arjun

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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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GATE2019 ME-2: 35
The activities of a project, their duration and the precedence relationships are given in the table. For example, in a precedence relationship $ X<Y,Z $ means that $X$ is predecessor of activities $Y$ and $Z$ ... $17$ $21$ $23$ $25$

The activities of a project, their duration and the precedence relationships are given in the table. For example, in a precedence relationship $”X<Y,Z”$ means that $X...

Arjun

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Arjun asked Feb 9, 2019

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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: 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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GATE2019 ME-2: 15
The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase in viscosity surface tension freezing range degree of superheat

The fluidity of molten metal of cast alloys (without any addition of fluxes) increases with increase inviscositysurface tensionfreezing rangedegree of superheat

Arjun

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GATE2015-1-30
In the assembly shown below, the part dimensions are: $L_1 = 22.0^{\pm 0.01} \: mm$, $L_2 = L_3$ = $10.0^{\pm 0.005} \: mm$. Assuming the normal distribution of part dimensions, the dimension $L_4$ in $mm$ for assembly condition would be: $2 .0^{\pm 0.008}$ $2 .0^{\pm 0.012}$ $2 .0^{\pm 0.016}$ $2 .0^{\pm 0.020}$

In the assembly shown below, the part dimensions are:$L_1 = 22.0^{\pm 0.01} \: mm$,$L_2 = L_3$ = $10.0^{\pm 0.005} \: mm$.Assuming the normal distribution of part dimens...

Arjun

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Arjun asked Feb 24, 2017

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GATE2019 ME-2: 50
The figure shows a pouring arrangement for casting of a metal block. Frictional losses are negligible. The acceleration due to gravity is $9.81 \: m/s^2$ .The time (in $s$, round off to two decimal places) to fill up the mold cavity (of size $40 \: cm \times 30 \: cm \times 15 \: cm$) is _____

The figure shows a pouring arrangement for casting of a metal block. Frictional losses are negligible. The acceleration due to gravity is $9.81 \: m/s^2$ .The time (in $s...

Arjun

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Arjun asked Feb 9, 2019

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GATE Mechanical 2014 Set 2 | Question: 21
A robot arm $PQ$ with end coordinates $P(0,0)$ and $Q(2,5)$ rotates counter clockwise about $P$ in the $XY$ plane by $90^\circ$. The new coordinate pair of the end point Q is $(−2,5)$ $(−5,2)$ $(−5, −2)$ $(2, −5)$

A robot arm $PQ$ with end coordinates $P(0,0)$ and $Q(2,5)$ rotates counter clockwise about $P$ in the $XY$ plane by $90^\circ$. The new coordinate pair of the end point ...

Arjun

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Arjun asked Feb 19, 2017

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GATE2019 ME-2: 53
A through hole is drilled in an aluminium alloy plate of $15 \: mm$ thickness with a drill bit of diameter $10$ mm, at a feed of $0.25$ mm/rev and a spindle speed of $1200$ rpm. If the specific energy required for cutting this material is $0.7 \: N \cdot m/mm^3$, the power required for drilling is ____________$W$ (round off to two decimal places)

A through hole is drilled in an aluminium alloy plate of $15 \: mm$ thickness with a drill bit of diameter $10$ mm, at a feed of $0.25$ mm/rev and a spindle speed of $120...

Arjun

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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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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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GATE2015-1-35
An orthogonal turning operation is carried out under the following conditions: rake angle = $5^{\circ}$; spindle rotational speed = $400 \text{ rpm}$; axial feed = $0.4 \text{ m/min}$ and radial depth of cut = $5 \text{ mm}$. The chip thickness, $t_c$, is found to be $3 \text{ mm}$. The shear angle (in degrees) in this turning process is_____

An orthogonal turning operation is carried out under the following conditions: rake angle = $5^{\circ}$; spindle rotational speed = $400 \text{ rpm}$; axial feed = $0.4 \...

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Arjun asked Feb 24, 2017

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GATE Mechanical 2014 Set 2 | Question: 20
The flatness of a machine bed can be measured using Vernier calipers Auto collimator Height gauge Tool maker’s microscope

The flatness of a machine bed can be measured usingVernier calipersAuto collimatorHeight gaugeTool maker’s microscope

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GATE2019 ME-2: 55
The annual demand of valves per year in a company is $10,000$ units. The current order quantity is $400$ valves per order. The holding cost is Rs. $24$ per valve per year and the ordering cost is Rs. $400$ per order. If the current order ... Economic Order Quantity, then the saving in the total cost of inventory per year will be Rs. __________ (round off to two decimal places).

The annual demand of valves per year in a company is $10,000$ units. The current order quantity is $400$ valves per order. The holding cost is Rs. $24$ per valve per year...

Arjun

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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 Mechanical 2014 Set 4 | Question: 20
Within the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoes microstructural changes but does not melt neither melting nor microstructural changes both melting and microstructural changes after solidification melting and retains the original microstructure after solidification

Within the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoesmicrostructural changes but does not meltneither melting nor microstructural c...

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Arjun asked Feb 19, 2017