A single point cutting tool with a nose radius of 0.4 mm was used to turn a component in a lathe employing feed rate of 0.3 mm/rev. If the feed rate is doubled, the ideal surface roughness (peak-to-valley height) produced on the components will increase by a factor of

[PI 2003]

- a)2
- b)4
- c)8
- d)16

Correct answer is option 'B'. Can you explain this answer?

Constructing Careers answered • 4 hours ago

After introducing slack variables s and t, the initial basic feasible solution is represented by the table below (basic variables are s = 6 and t = 6, and the objective function value is 0).

After some simplex iterations, the following table is obtained

From this, one can conclude that

After some simplex iterations, the following table is obtained

From this, one can conclude that

[2008]

- a)the LP has a unique optimal solution
- b)the LP has an optimal solution that is not unique
- c)the LP is infeasible
- d)the LP is unbounded

Correct answer is option 'B'. Can you explain this answer?

Constructing Careers answered • 4 hours ago

z = 4x + 6y

3x + 2y ≤ 6

2x + 3y ≤ 6

x, y > 0

3x + 2y ≤ 6

2x + 3y ≤ 6

x, y > 0

Feasible region (O–A–B–C–0) Since, Slope of objective function is equal to the slope of constraint Hence LPP has multiple optimal solution

At B (6/5, 6/5)

Z = 12

At C (0,2)

Z = 12

At B (6/5, 6/5)

Z = 12

At C (0,2)

Z = 12

Sandeep Prajapati asked • 1 minute ago

Two shafts *A* and *B* under pure torsion are of identical length and identical weight and are made of the same material. The shaft *A* is solid and the shaft *B* is hollow. We can say that

- a)shaft
*B*is better than shaft*A* - b)shaft
*A*is better than shaft*B* - c)both the shafts are equally good

Correct answer is option 'A'. Can you explain this answer?

Assertion (A): A diamond tool is used for USM of glass workpiece.

Reason (R): Diamond is harder than glass

Reason (R): Diamond is harder than glass

[PI 1990]

- a)Both A and R are true and R is the correct explanation of A
- b)Both A and R are true but R is not a correct explanation of A
- c)A is true but R is false
- d)A is false but R is true

Correct answer is option 'D'. Can you explain this answer?

Gate Funda answered • 4 hours ago

Soft tool material must be used in order to avoid tool wear.

In orthogonal turning of a cylindrical tube of wall thickness 5 mm, the axial and the tangential cutting forces were measured at 1259 N and 1601 N, respectively. The measured chip thickness after machining was found to be 0.3 mm. The rake angle was 10° and the axial feed was 100 mm/min. The rotational speed of the spindle was 1000 rpm. Assuming the material to be perfectly plastic and merchant’s first solution, the shear strength of the martial is closest to

[ME 2019,Set-1]

- a)875 M Pa
- b)200 M Pa
- c)722 M Pa
- d)920 M Pa

Correct answer is option 'C'. Can you explain this answer?

Gate Funda answered • 4 hours ago

For, orthogonal turning,

λ = 90°, F_{c} = 1601 N

Chip thickness 't_{c}' = 0.3,

F_{t} = 1259 N.

N = 1000 r pm , α = 10 m

= 1601 x cos19.19° - 1259 sin 19.19

= 1098.20 N

λ = 90°, F

Chip thickness 't

F

N = 1000 r pm , α = 10 m

= 1601 x cos19.19° - 1259 sin 19.19

= 1098.20 N

A manufacturer produces two types of products, 1 and 2, at production levels of x_{1} and x_{2} respectively. The profit is given is 2x_{1} + 5x_{2}. The production constraints are:

x_{1} + 3x_{2} < 40

3x1 + x_{2} < 24

x_{1} + x_{2} < 10

x_{1} > 0 x_{2} > 0

The maximum profit which can meet the constraints is

x

3x1 + x

x

x

The maximum profit which can meet the constraints is

[2003]

- a)29
- b)38
- c)44
- d)75

Correct answer is option 'C'. Can you explain this answer?

Pioneer Academy answered • 4 hours ago

Feasible Region (0– A – B – C– 0) At point (A) 0, 10) Z = 2 (0) + 5 (10) = 50

At point B (7,3) Z = 2(7) + 5(3) = 2y At point C (8, 0) Z = 2(16) + 5(0) = (16) 2

⇒32

Hence maximum profit is Z_{max} = 50

No correct option is given.

At point B (7,3) Z = 2(7) + 5(3) = 2y At point C (8, 0) Z = 2(16) + 5(0) = (16) 2

⇒32

Hence maximum profit is Z

No correct option is given.

Consider the radiation heat exchange inside an annulus between two very long concentric cylinders. The radius of the outer cylinder is R_{0} and that of the inner cylinder is R_{i}. The radiation view factor of the outer cylinder onto itself is

[2016]

- a)
- b)
- c)
- d)

Correct answer is option 'D'. Can you explain this answer?

Pioneer Academy answered • 4 hours ago

View factor

F

F

Reciprocacy theorem

A

⇒

F

∴ F

Details pertaining to an orthogonal metal cutting process are given below:

Chip thickness ratio 0.4

Undeformed thickness 0.6 mm

Rake angle +10°

Cutting speed 2.5 m/s

Mean thickness of primary shear zone 25 microns

The shear strain rate in s-1 during the process is

Chip thickness ratio 0.4

Undeformed thickness 0.6 mm

Rake angle +10°

Cutting speed 2.5 m/s

Mean thickness of primary shear zone 25 microns

The shear strain rate in s-1 during the process is

[PI 2012]

- a)0.1781 × 10
^{5} - b)0.7754 × 10
^{5} - c)1.0104 × 10
^{5} - d)4.397 × 10
^{5}

Correct answer is option 'C'. Can you explain this answer?

Manish Aggarwal answered • 4 hours ago

Feed rate in slab milling operation is equal to

[ME 2018,Set-2]

- a)rotation per minute (rpm)
- b)product of rpm and number of teeth in the cutter
- c)product of rpm, feed per tooth and number of teeth in the cutter
- d)product of rpm, feed per tooth and number of teeth in contact

Correct answer is option 'C'. Can you explain this answer?

Manish Aggarwal answered • 4 hours ago

Table feed or Feed rate

In a typical metal cutting operation, using a cutting tool a positive rake a = 10°, it is as observed that the shear angle was 20°. The friction angle is

[ME 1997]

- a)45°
- b)30°
- c)60°
- d)40°

Correct answer is option 'C'. Can you explain this answer?

Pathways Academy answered • 4 hours ago

α = 10°, ϕ= 20°

Ernest & Merchants' theory

2ϕ + β - α = 90°

2 × 20 + β - 10 = 90°

40 + β - 10 = 90°

β = 60°

Ernest & Merchants' theory

2ϕ + β - α = 90°

2 × 20 + β - 10 = 90°

40 + β - 10 = 90°

β = 60°

In a counterflow heat exchanger, hot fluid enters at 60°C and cold fluid leaves at 30°C. Mass flow rate of the hot fluid is 1 kg/s and that the cold fluid is 2 kg/s. Specific heat of the hot fluid is 10 kJ/kgK and that of the cold fluid is 5 kJ/kgK. The Log Mean Temperature Difference (LMTD) for the heat exchanger in °C is

[2007]

- a)15
- b)30
- c)35
- d)45

Correct answer is option 'B'. Can you explain this answer?

Pathways Academy answered • 4 hours ago

Heat capacity of hot fluid

= 1 × 10 = 10 kJ / k – s

Heat capacity of cold fluid

= 2 × 5 = 10 kJ / k – s

Since heat capacity is same, so LMTD is difference of temperature at either end

i.e. LMTD = 60º – 30º = 30º C

= 1 × 10 = 10 kJ / k – s

Heat capacity of cold fluid

= 2 × 5 = 10 kJ / k – s

Since heat capacity is same, so LMTD is difference of temperature at either end

i.e. LMTD = 60º – 30º = 30º C

Abhishek Govil asked • 26 minutes ago

In the design of shafts made of ductile materials subjected to twisting moment and bendingmoment, the recommended theory of failure is

- a)maximum principal stress theory
- b)maximum principal strain theory
- c)maximum shear stress theory
- d)maximum strain – energy theory

Correct answer is option 'C'. Can you explain this answer?

Ankur Pandey asked • 44 minutes ago

Which one of the following loadings is considered for design of axles ?

- a)Bending moment only
- b)Twisting moment only
- c)Combined bending moment and torsion
- d)Combined action of bending moment, twisting moment and axial thrust

Correct answer is option 'A'. Can you explain this answer?

Neelotpal Sardar asked • 1 hour ago

In a CNC machine feed drive, a stepper motor with step angle of 1.8^{0} drives a lead screw with pitch of 2 mm. The basic length unit (BLU) for this drive is

- a)10 microns
- b)20 microns
- c)40 microns
- d)100 microns

Correct answer is option 'A'. Can you explain this answer?

Daniyal Zahid asked • 2 hours ago

For the double long shoe, external drum brake illustrated in the figure (All dimensions are in mm), the face width of the shoes is 30 mm. the coefficient of friction between the shoe and the drum can be taken as 0.28.

Q.

Determine the actuation load on the left-had shoe when the pressure on the brake lining does not exceed 1.4 MPa

- a)3961 N
- b)3266 N
- c)1243 N
- d)2004 N

Correct answer is option 'D'. Can you explain this answer?

Mantu Das asked • 2 hours ago

A medium carbon steel workpiece is turned on a lath at 50 m/ min cutting speed, 0.8 mm/ revfeed and 1.5 mm depth of cut, what is the rate of metal removal

- a)100 mm
^{3}/ min - b)20000 mm
^{3}/min - c)60000 mm
^{3}/ min - d)Can not be calculated with the given data

Correct answer is option 'C'. Can you explain this answer?

Shivam Saxena asked • 2 hours ago

Consider the following statements:

1. The degree of freedom for lower kinematic pairs is always equal to one.

2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair

3.Oldham's coupling mechanism has two prismatic pairs and two revolute pairs.

2. A ball-and-socket joint has 3 degrees of freedom and is a higher kinematic pair

3.Oldham's coupling mechanism has two prismatic pairs and two revolute pairs.

Which of the statements given above is/are correct?

- a)1, 2 and 3
- b)1 only
- c)2 and 3
- d)3 only

Correct answer is option 'A'. Can you explain this answer?

Aadarsh Vikram asked • 3 hours ago

Consider the following two processes:

a. A heat source at 1200 K loses 2500 kJ of heat to sink at 800 K

b. A heat source at 800 K loses 2000 kJ of heat to sink at 500 K

Which of the following statements is TRUE?

- a)Process I is more irreversible than Process II
- b)Process II is more irreversible than Process I
- c)Irreversibility associated in both the processes is equal
- d)Both the processes are reversible

Correct answer is option 'B'. Can you explain this answer?

SATYA KUMARI asked • 3 hours ago

Two plates of the same metal having equal thickness are to be butt welded with electric arc.When the plate thickness changes, welding is achieved by

[ME 2002]

- a)Adjusting the current
- b)Adjusting the duration of the current
- c)Changing the electrode size
- d)Changing the electrode coating

Correct answer is option 'A'. Can you explain this answer?

SINGH AMIT asked • 3 hours ago

The strength of a brazed joint

[ME 2005]

- a)decreases with increase in gap between the two joining surfaces
- b)increases with increase in gap between the two joining surfaces
- c)decreases up to certain gap between the two joining surfaces beyond which it increases
- d)increases up to certain gap between the two joining surfaces beyond which it decreases

Correct answer is option 'D'. Can you explain this answer?

PREM DEVI asked • 3 hours ago

Penetration is increased by

[ME 1990]

- a)Increasing welding current and welding speed
- b)Increasing welding current and decreasing welding speed
- c)Decreasing welding current and welding speed
- d)Decreasing welding current and increasing welding speed

Correct answer is option 'B'. Can you explain this answer?

ASIF HABIB asked • 3 hours ago

In an arc welding process, the voltage and current are 25 V and 300 A respectively. The arc heat transfer efficiency is 0.85 and welding speed is 8 mm/s. The net heat input (in J/mm) is

[ME 2006]

- a)64
- b)797
- c)1103
- d)79700

Correct answer is option 'B'. Can you explain this answer?

DEBARSHI HALDER asked • 3 hours ago

In an arc welding process, welding speed is doubled. Assuming all other process parameters to be constant, the cross sectional area of the weld bead will

[ME 2017,Set-1]

- a)increase by 25%
- b)increase by 50%
- c)reduce by 25%
- d)reduce by 50%

Correct answer is option 'D'. Can you explain this answer?

PRIYANKA KAPOOR asked • 3 hours ago

During a steady gas metal arc welding with direct current electrode positive polarity, the welding current, voltage and weld speed are 150 A, 30 V and 6 m/min respectively. A metallic wire electrode of diameter 1.2 mm is being fed at a constant rate of 12 m/min. The density, specific heat and melting temp of the wire electrode are 7000 kg/m^{3}, 500 J/kg and 1530°C respectively.

Assume the ambient temp to be 30°C and neglect the latent heat of melting. Further consider that 2/3rd of the total electrical power is available for melting of the wire electrode. The melting efficiency (in percentage) of the wire electrode is

Assume the ambient temp to be 30°C and neglect the latent heat of melting. Further consider that 2/3rd of the total electrical power is available for melting of the wire electrode. The melting efficiency (in percentage) of the wire electrode is

[PI 2010]

- a)39.58
- b)45.25
- c)49.38
- d)54.98

Correct answer is option 'A'. Can you explain this answer?

KANCHAN KUMARI asked • 3 hours ago

For butt welding 40 mm thick steel plates, when the expected quantity of such jobs is 5000 per month over a period of 10 years, choose the best suitable welding process out of the following available alternatives.

[ME 1999]

- a)SAW
- b)Oxyacetylene gas welding
- c)EBM
- d)MIG

Correct answer is option 'A'. Can you explain this answer?

PRABAL RATHOUR asked • 3 hours ago

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 to 500 A. Assuming linear power source characteristic, the open circuit voltage and the short circuit current for the welding operation are

[ME 2012]

- a)45 V, 450 A
- b)75 V, 750 A
- c)95 V, 950 A
- d)150 V, 1500 A

Correct answer is option 'C'. Can you explain this answer?

SHAWETA KUMARI asked • 3 hours ago

Which of the following process can be used for welding of Aluminum alloys?

P. Submerged arc welding

Q. Gas metal arc welding

R. Electroslag welding

S. Gas tungsten arc welding

P. Submerged arc welding

Q. Gas metal arc welding

R. Electroslag welding

S. Gas tungsten arc welding

[PI 2003]

- a)P and Q
- b)Q and S
- c)Q and R
- d)R and S

Correct answer is option 'B'. Can you explain this answer?

Mayur Chawla asked • 3 hours ago

To restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads,

- a)Oil viscosity is to be decreased
- b)oil viscosity is to be increased
- c)Oil viscosity index is to be increased
- d)oil viscosity index is to be decreased

Correct answer is option 'B'. Can you explain this answer?

Rubi Kumari asked • 4 hours ago

The practice to use steam on the shell side and water on the tube side in condensers of steam power plant is because

[1994]

- a)to increase overall HT coefficient, water side velocity can be increased if water is on the tube side
- b)condenser can act as a Storage unit for condensed steam
- c)rate of condensation of steam is invariably smaller than the mass flow rate of cooling water
- d)it is easier to maintain vacuum on the shell side than on the tube side

Correct answer is option 'D'. Can you explain this answer?

Gokul Krishnan asked • 5 hours ago

Consider the following operations involved in forging a hexagonal bolt from a round bar stock, whose diameter is equal to the bolt diameter:

1. Flattening 2. Upsetting 3. Swaging 4. Cambering

1. Flattening 2. Upsetting 3. Swaging 4. Cambering

Q.

The correct sequence of these operations is

- a)1, 2, 3, 4
- b)2, 3, 4, 1
- c)2, 1, 3, 4
- d)3, 2, 1, 4

Correct answer is option 'A'. Can you explain this answer?

ìµœëª…ì² asked • 5 hours ago

Given

V_{b} = Blade speed

V = Absolute velocity of steam entering the blade

α = Nozzle angle

V

V = Absolute velocity of steam entering the blade

α = Nozzle angle

The efficiency of an impulse turbine is maximum when

- a)V
_{b}= 0.5 Vcosα - b)V
_{b}= Vcosα - c)V
_{b}= 0.5 V^{2}cosα - d)V
_{b}= V^{2}cosα

Correct answer is option 'A'. Can you explain this answer?

Amulya Das asked • 5 hours ago

The COP of a heat pump can be increased either by decreasing T_{H} by ΔT or by increasing T_{L} by ΔT. The new COP of the heat pump is

- a)same in both the cases
- b)highest if T
_{H}is decreased - c)highest it T
_{L }in in increased - d)independent of change in T
_{H}and T_{L}

Correct answer is option 'C'. Can you explain this answer?

aravinth chinnadurai asked • 5 hours ago

Consider the following parameter:

1. Oil pressure

2. Bearing metal temperature

3. Drain oil temperature

4. Bearing vibration

5. Friction coefficien

1. Oil pressure

2. Bearing metal temperature

3. Drain oil temperature

4. Bearing vibration

5. Friction coefficien

Which of the above should be monitored for determining safe operation of journal bearing?

- a)1,2 and 3
- b)1,2, 3 and 4
- c)1, 2, 3 and 5
- d)All of the above

Correct answer is option 'B'. Can you explain this answer?

ANKIT KUMAR asked • 6 hours ago

A component can be produced by any of the four processes I, II, III and IV. The fixed cost and the variable cost for each of the processes are listed below. The most economical process for producing a batch of 100 pieces is

[2014]

- a)I
- b)II
- c)III
- d)IV

Correct answer is option 'B'. Can you explain this answer?

ANSHAD M asked • 6 hours ago

When the annual demand of a product is 24000 units, the EOQ (Economic Order Quantity) is 2000 units. If the annual demand is 48000 units the most appropriate EOQ will be

[1991]

- a)1000 units
- b)2000 units
- c)2800 units
- d)4000 units

Correct answer is option 'D'. Can you explain this answer?

MANENDRA KUMAR asked • 6 hours ago

In machine shop, pins of 15 mm diameter are produced at a rate of 1000 per month and the same is consumed at a rate of 500 per month.The production and consumption continue simultaneously till the maximum inventory is reached. Then inventory is allowed to reduce to zero due to consumption. The lot size of production is 1000. If backlog is not allowed, the maximum inventory level is

[2007]

- a)400
- b)500
- c)600
- d)700

Correct answer is option 'B'. Can you explain this answer?

KARISHMA THAKUR asked • 6 hours ago

The diameter and rotational speed of a job are 100 m and 500 rpm respectively. The high spots (chatter marks) are found at a spacing of 30 deg on the job surface. The chatter frequency is

[PI 1990]

- a)5 Hz
- b)12 Hz
- c)100 Hz
- d)500 Hz

Correct answer is option 'C'. Can you explain this answer?

SANDEEP MAHARANA asked • 6 hours ago

A 60 deg symmetrical V tool is used in shaping at workpiece with a depth of cut of 0.1 mm and feed of 0.1 mm/stroke. The theoretical peak to valley height, in mm, of the surface produced is

[PI 1995]

- a)0.043
- b)0.067
- c)0.086
- d)None of these

Correct answer is option 'C'. Can you explain this answer?

POOJA KUMARI asked • 6 hours ago

A job of the shape shown in the figure below is to be machined on a lathe. The tool best suited for machining of this job must have

[PI 2004]

- a)positive side rake angle
- b)positive back rake angle
- c)positive cutting edge inclination angle
- d)negative cutting edge inclination angle

Correct answer is option 'A'. Can you explain this answer?

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