MCQOPTIONS
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MCQOPTIONS
This section includes 843 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science and Manufacturing Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 551. |
High alloy steel components are preheated before welding for reducing |
| A. | heat affected zone |
| B. | total energy consumption |
| C. | total time of welding |
| D. | welding stresses |
| Answer» E. | |
| 552. |
In TIG welding a.... A.... and.... B.... electrode is used |
| A. | non-consumable/consumable |
| B. | coated/bare |
| C. | consumable |
| D. | None of the above |
| Answer» B. coated/bare | |
| 553. |
A gas t ungst en ar c wel di ng oper at i on i s performed using a current of 250 A and an arc voltage of 20 V at a welding speed of 5 mm/s. Assuming that the arc efficiency is 70%, the net heat input per unit length of the weld will be ____ kJ/mm (round off to one decimal place). |
| A. | 0.1 |
| B. | 1.4 |
| C. | 0.7 |
| D. | None of these |
| Answer» D. None of these | |
| 554. |
A welding operation is being performed with voltage = 30 V and current = 100 A. The crosssectional area of the weld bead is 20 mm2. The work-piece and filler are of titanium for which of the specific energy of melting is 14 J/mm . |
| A. | 5.7 |
| B. | 2.1 |
| C. | 33.9 |
| D. | 7.5 |
| Answer» E. | |
| 555. |
Which of the following process can be used for welding of Aluminum alloys? |
| A. | P and Q |
| B. | Q and S |
| C. | Q and R |
| D. | R and S |
| Answer» C. Q and R | |
| 556. |
The area of cross-section of weld bead in mm is |
| A. | 16.3 |
| B. | 25.1 |
| C. | 30.3 |
| D. | 38.6 |
| Answer» C. 30.3 | |
| 557. |
The heat input per unit length of the weld in kJ/cm is |
| A. | 0.18 |
| B. | 0.28 |
| C. | 10.83 |
| D. | 16.66 |
| Answer» D. 16.66 | |
| 558. |
The rake angle in drill |
| A. | Increase from centre to periphery |
| B. | Decreases from centre to periphery |
| C. | Remains constant |
| D. | Is irrelevant to the drilling operation |
| Answer» E. | |
| 559. |
In the above problem, the coefficient of friction at the chip tool Interface obtained using Earnest and Merchant theory is |
| A. | 0.18 |
| B. | 0.36 |
| C. | 0.71 |
| D. | 0.98 |
| Answer» E. | |
| 560. |
The thickness of the produced chip is |
| A. | 0.511 mm |
| B. | 0.528 mm |
| C. | 0.818 mm |
| D. | 0.846 mm |
| Answer» B. 0.528 mm | |
| 561. |
The effect of rake angle on the mean friction angle in machining can be explained by |
| A. | Sliding model of friction |
| B. | Sticking and then sliding friction model |
| C. | Sticking friction model |
| D. | Sliding and then sticking friction model |
| Answer» C. Sticking friction model | |
| 562. |
Cutting tools are provided with large positive rake angle mainly for |
| A. | Increasing the strength of the cutting edge |
| B. | Avoiding rubbing action with the finished surfaces |
| C. | Reducing the magnitude of the cutting force |
| D. | Better heat dissipation |
| Answer» D. Better heat dissipation | |
| 563. |
For turning NiCr alloy steel at cutting speeds of 64 m/min and 100 m/min, the respective tool lives are 15 min-and 12 min. The tool life for a cutting speed of 144 m/min is |
| A. | 8 min |
| B. | 9 min |
| C. | 10 min |
| D. | 11.5 min |
| Answer» D. 11.5 min | |
| 564. |
Machine tool, structures are made... for high process capability (tough/rigid/strong) |
| A. | rigid |
| B. | tough |
| C. | strong |
| D. | None of these |
| Answer» B. tough | |
| 565. |
A steel bar 200 mm in diameter is turned at a feed of 0.25 mm/rev with a depth of cut of 4 mm. The rotational speed of the workpiece is 160 rpm. The material removal rate in mm |
| A. | 160 |
| B. | 167.6 |
| C. | 1600 |
| D. | 1675.5 |
| Answer» E. | |
| 566. |
Tool life testing on a lathe under dry cutting conditions gauge n and C of Taylor tool life equation as 0.12 and 130 m/min. respectively. When a coolant was used, C increased by 10%. The increased tool life with the use of coolant at a cutting speed of 90 m/min is |
| A. | 47.4 min |
| B. | 37.4 min |
| C. | 27.4 min |
| D. | 17.4 min |
| Answer» B. 37.4 min | |
| 567. |
Helix angle of fast helix drill is normally |
| A. | 35 deg |
| B. | 60 deg |
| C. | 90 deg |
| D. | 5 deg |
| Answer» B. 60 deg | |
| 568. |
Tool life of a 10 hours is obtained when cutting with a single point tool at 63 m/min. If Taylor's constant C = 257.35, tool life on doubling the velocity will be |
| A. | 5 hours |
| B. | 25.7 min |
| C. | 38.3 min |
| D. | unchanged |
| Answer» C. 38.3 min | |
| 569. |
During a TIG welding process, the arc current and arc voltage were 50 A and 60 V, respectively, when the welding speed was 150 mm/min. In another process, the TIG welding is carried out at a welding speed of 120 mm/min at the same arc voltage and heat input to the material so that weld quality remains the same. The welding current (in A) for this process is ___________ |
| A. | 40.00 |
| B. | 44.72 |
| C. | 55.90 |
| D. | 62.25 |
| Answer» B. 44.72 | |
| 570. |
A DC welding power source has a linear voltagecurrent (V-I) characteristic with open circuit voltage of 80 V and a short circuit current of 300 A. For maximum arc power, the current (in Ampere) should be set as______. |
| A. | 150 |
| B. | 120 |
| C. | 179 |
| D. | 270 |
| Answer» B. 120 | |
| 571. |
A batch of 10 cutting tools could produce 500 components while working at 50 rpm with a tool feed of 0.25 mm/rev and depth of cut of 1 mm. A similar batch of 10 tools of the same specification could produce 122 components while working at 80 rpm with a feed of 0.25 mm/rev and 1 mm depth of cut. How many components can be produced with one cutting tool at 60 rpm? |
| A. | 29 |
| B. | 31 |
| C. | 37 |
| D. | 42 |
| Answer» B. 31 | |
| 572. |
Calculate the smallest punch diameter that can be designed for piercing sheet metal strip with the following data. Crushing strength of the punch material is 1500 MPa. Thickness of the sheet is 2 mm, factor of safety is 3, shear strength of the sheet material 500 MPa is |
| A. | 2 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 24 mm |
| Answer» D. 24 mm | |
| 573. |
A hydraulic press is used to produce circular blanks of 10 mm diameter from a sheet of 2 mm thickness. If the shear strength of the sheet material is 400 N/mm2, the force required for producing a circular blank is |
| A. | 8 kN |
| B. | 25.13 kN |
| C. | 31.42kN |
| D. | 125.66 kN |
| Answer» C. 31.42kN | |
| 574. |
Which one is not a method of reducing cutting forces to prevent the overloading of press? |
| A. | providing shear on die |
| B. | providing shear on punch |
| C. | increasing the clearance |
| D. | stepping punches |
| Answer» B. providing shear on punch | |
| 575. |
For 50% penetration of work material, a punch with single shear equal to thickness will |
| A. | reduce the punch load to half the value |
| B. | increase the punch load by half the value |
| C. | maintain the same punch load |
| D. | reduce the punch load to quarter load |
| Answer» B. increase the punch load by half the value | |
| 576. |
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 |
| A. | 64 |
| B. | 797 |
| C. | 1103 |
| D. | 79700 |
| Answer» C. 1103 | |
| 577. |
If the elongation factor during rolling of an ingot is 1.22. The minimum number of passes needed to produce a section 250 x 250 mm from an ingot of 750 750 mm are |
| A. | 8 |
| B. | 9 |
| C. | 10 |
| D. | 12 |
| Answer» D. 12 | |
| 578. |
Consider the following statements related piercing and blanking |
| A. | 1 and 2 |
| B. | 1 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» C. 2 and 3 | |
| 579. |
While rolling a strip the peripheral velocity of the roll is.... A.... than the entry velocity of the strip and is... B... the exit velocity of the strip. |
| A. | less than/greater than |
| B. | greater than/less than/equal to |
| C. | less than |
| D. | greater than |
| Answer» B. greater than/less than/equal to | |
| 580. |
Gating ratio of 1: 2: 4 is used to design the gating system for magnesium alloy casting. This gating ratio refers to the cross-section areas of the various gating elements as given below: |
| A. | 1, 2 and 3 |
| B. | 1, 3 and 2 |
| C. | 2, 3 and 1 |
| D. | 3, 1 and 2 |
| Answer» C. 2, 3 and 1 | |
| 581. |
A 10 mm thick steel bar is to be horizontally cast with two correctly top risers of adequate feeding capacity. Assuming end effect without chill, what should be the theoretical length of the bar? |
| A. | 96 mm |
| B. | 132 mm |
| C. | 192 mm |
| D. | 156 mm |
| Answer» C. 192 mm | |
| 582. |
The permeability of moulding sand was determined using a standard AFS sample by passing 2000 cc of air at a gauge pressure of 10 g/cm . If the time taken for the air to escape was 1 min, the permeability number is |
| A. | 112.4 |
| B. | 100.2 |
| C. | 75.3 |
| D. | 50.1 |
| Answer» B. 100.2 | |
| 583. |
The height of the down sprue is 175 mm and its CS are at the base is 200 mm . The CS area of the horizontal runner is also 200 mm . Assuming no losses, indicate the correct choice for-the time (second) required to fill a mould cavity of volume 10 |
| A. | 2.67 |
| B. | 8.45 |
| C. | 26.7 |
| D. | 84.50 |
| Answer» D. 84.50 | |
| 584. |
According to Chvorinov's rule, the solidification time of a casting is proportional to (Volume/ surface area) |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 585. |
Application |
| A. | A 1, B 5, C 3, D 4 |
| B. | A 5, B 4, C 3, D 1 |
| C. | A 4, B 5, C 1, D 3 |
| D. | A 4, B 5, C 3, D 1 |
| Answer» E. | |
| 586. |
Chaplets are placed between mould in order to |
| A. | promote directional solidification |
| B. | help alloying the metal |
| C. | facilitate easy removal of core from casting |
| D. | prevent core movement due to buoyancy |
| Answer» B. help alloying the metal | |
| 587. |
The normal force acting the chip-tool interface in N is |
| A. | 1000 |
| B. | 1500 |
| C. | 2000 |
| D. | 2500 |
| Answer» C. 2000 | |
| 588. |
Thrust force in drilling can be reduced by... A., the point angle and by... B... the helix angle of the drill |
| A. | decreasing/reducing |
| B. | increasing/reducing |
| C. | Both A and B |
| D. | None of these |
| Answer» C. Both A and B | |
| 589. |
Minimum shear-strain in orthogonal turning with a cutting tool of zero rake angle is |
| A. | 0.0 |
| B. | 0.5 |
| C. | 1.0 |
| D. | 2.0 |
| Answer» E. | |
| 590. |
During orthogonal cutting of MS with a 10 deg rake angle tool, the chip thickness ratio was obtained as 0.4. The shear angle (in degrees) evaluated from this data is |
| A. | 6.53 |
| B. | 20.22 |
| C. | 22.94 |
| D. | 50.00 |
| Answer» D. 50.00 | |
| 591. |
In HSS, the tungsten can be substituted by |
| A. | Chromium |
| B. | Nickel |
| C. | Molybdenum |
| D. | Cobalt |
| Answer» D. Cobalt | |
| 592. |
In an orthogonal machining with a single point cutting tool of rake angle 10 , 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). |
| A. | 0.7355 |
| B. | 0.74 |
| C. | 0.243 |
| D. | 0.144 |
| Answer» C. 0.243 | |
| 593. |
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 |
| A. | 875 MPa |
| B. | 200 MPa |
| C. | 722 MPa |
| D. | 920 MPa |
| Answer» D. 920 MPa | |
| 594. |
Match the Machine Tools (Group A) with the probable Operations (Group B) : |
| A. | P-1, Q-2, R-4, S-3 |
| B. | P-2, Q-1, R-4, S-3 |
| C. | P-3, Q-1, R-4, S-2 |
| D. | P-3, Q-4, R-2, S-1 |
| Answer» D. P-3, Q-4, R-2, S-1 | |
| 595. |
A milling cutter having 8 teeth is rotating at 100 rpm. The workpiece feed is set at 40 mm/ min the feed per tooth is |
| A. | 5 mm |
| B. | 0.05 mm |
| C. | 0.4 mm |
| D. | 0.2 mm |
| Answer» D. 0.2 mm | |
| 596. |
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 |
| A. | 5 Hz |
| B. | 12 Hz |
| C. | 100 Hz |
| D. | 500 Hz |
| Answer» D. 500 Hz | |
| 597. |
Orthogonal machining of a steel workpiece is done with a HSS tool of zero rake angle. The ratio of the cutting force and the thrust force on the tool is 1 : 0.372. The length of cut chip is 4.71 mm while the uncut chip length is 10 mm. What is the shear plane angle and friction angle in degree? |
| A. | 32.49, 10.22 |
| B. | 25.22, 20.41 |
| C. | 64.78 20.41 |
| D. | 25.22, 23.21 |
| Answer» C. 64.78 20.41 | |
| 598. |
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 |
| A. | 2 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» C. 8 | |
| 599. |
The cutting length of the broach for the key way cutting in a 150 mm long east iron gear hub. Given that width of the key way is 9 mm depth of key way is 4.5 mm of finishing teeth = 4 and no. of semi finishing teeth = 8. Rise per tooth Pitch Roughing teeth 0.1 mm 22 mm Semi finishing 0.0125 mm 20 mm Finishing teeth 0 mm 20 mm |
| A. | 968 mm |
| B. | 160 mm |
| C. | 1208 mm |
| D. | None of these |
| Answer» D. None of these | |
| 600. |
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 |
| A. | 0.043 |
| B. | 0.067 |
| C. | 0.086 |
| D. | None of these |
| Answer» D. None of these | |