MCQOPTIONS
Saved Bookmarks
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.
| 501. |
In centrifugal casting, the lighter impurities are |
| A. | uniformly distributed |
| B. | forced towards the outer surface |
| C. | trapped near the mean radius of the casting |
| D. | collected at the centre of the casting |
| Answer» D. collected at the centre of the casting | |
| 502. |
During solidification of a pure molten metal, the grains in the casting near the mould wall area |
| A. | coarse and randomly oriented |
| B. | fine and randomly oriented |
| C. | fine and ordered |
| D. | coarse and ordered |
| Answer» E. | |
| 503. |
In orthogonal turning of low carbon steel pipe with principal cutting edge angle of 90 , the main cutting force is 1000 N and the feed force is 800 N. The shear angle is 25 and orthogonal rake angle is zero. Employing Merchants theory, the ratio of friction force to normal force acting on the cutting tool is |
| A. | 1.56 |
| B. | 1.25 |
| C. | 0.80 |
| D. | 0.64 |
| Answer» D. 0.64 | |
| 504. |
In orthogonal turning of medium carbon steel, the specific machining energy is 2.0 J/mm |
| A. | 40 |
| B. | 80 |
| C. | 400 |
| D. | 800 |
| Answer» E. | |
| 505. |
In orthogonal turning of a low carbon steel bar of diameter 150 mm with uncoated carbide tool, the cutting velocity is 90 m/min. The feed is 0.24 mm/rev and the depth of cut is 2 mm. The chip thickness obtained is 0.48 mm. If the orthogonal rake angle is zero and the principal cutting edge angle is 90 , the shear angle in degree is |
| A. | 20.56 |
| B. | 26.56 |
| C. | 30.56 |
| D. | 36.56 |
| Answer» C. 30.56 | |
| 506. |
A researcher conducts electrochemical machining (ECM) on a binary alloy (density 6000 kg/m3) of iron (atomic weight 56, valency 2) and metal P (atomic weight 24, valency 4). Faraday's constant = 96500 coulomb/mole. Volumetric material removal rate of the alloy is 50 mm3/s at a current of 2000 A. The percentage of the metal P in the alloy is closest to |
| A. | 40 |
| B. | 25 |
| C. | 15 |
| D. | 79 |
| Answer» C. 15 | |
| 507. |
Match the most suitable manufacturing processes for the following parts, |
| A. | P-4, Q-3, R-1, S-2 |
| B. | P-4, Q-3, R-2, S-1 |
| C. | P-3, Q-1 R-4, S-2 |
| D. | P-1, Q-2, R~4, S-3 |
| Answer» B. P-4, Q-3, R-2, S-1 | |
| 508. |
Arrange the processes in the increasing order of their maximum material removal rate. Electrochemical Machining (ECM) Ultrasonic Machining (USM) Electron Beam Machining (EBM) Laser Beam Machining (LBM) Electric Discharge Machining (EDM) |
| A. | USM, LBM, EBM, EDM, ECM |
| B. | EBM, LBM, USM, ECM, EDM |
| C. | LBM, EBM, USM, ECM, EDM |
| D. | LBM, EBM, USM, EDM, ECM |
| Answer» E. | |
| 509. |
The most widely used reinforcement in modern day FRP tennis racket is |
| A. | glass |
| B. | carbon |
| C. | aluminium |
| D. | magnesium |
| Answer» C. aluminium | |
| 510. |
Harden ability of steel is a measure of |
| A. | the maximum hardness that can be obtained when it is austenitized and then quenched |
| B. | the depth to which required hardening is obtained when it is austenitized and then quenched |
| C. | the ability to harden when it is cold worked |
| D. | the ability to retain its hardness when it is heated to elevated temperatures |
| Answer» C. the ability to harden when it is cold worked | |
| 511. |
The "Jominy test" is used to find |
| A. | Young's modulus |
| B. | harden ability |
| C. | yield strength |
| D. | thermal conductivity |
| Answer» C. yield strength | |
| 512. |
A hole of 20 mm diameter is to be drilled in a steel block of 40 mm thickness. The drilling is performed at rotational speed of 400 rpm and feed rate of 0.1 mm/rev. The required approach and over run of the drill together, is equal to the radius of drill. The drilling time (in minute) is |
| A. | 1.00 |
| B. | 1.25 |
| C. | 1.50 |
| D. | 1.75 |
| Answer» C. 1.50 | |
| 513. |
If the Taylor's tool life exponent n is 0.2, and the tool changing time is 1.5 min, then the tool life (in min) for maximum production rate is___ |
| A. | 4 |
| B. | 6 |
| C. | 10 |
| D. | None of these |
| Answer» C. 10 | |
| 514. |
In PTP type of NC system |
| A. | Control of position and velocity of the tool is essential |
| B. | Control of only position of the tool is sufficient |
| C. | Control of only velocity of the tool is sufficient |
| D. | Neither position nor velocity need be controlled |
| Answer» C. Control of only velocity of the tool is sufficient | |
| 515. |
Numerically controlled machine tools are better suited for... (batch/mass) production, because their setup time is.... (larger/smaller) in comparison to special purpose machine tools |
| A. | Set-up time for NC machines is smaller in comparison to special purpose machines hence, used for batch Production |
| B. | Set-up time for NC machines is not smaller in comparison to special purpose machines hence, used for batch Production |
| C. | A and B |
| D. | None of these |
| Answer» B. Set-up time for NC machines is not smaller in comparison to special purpose machines hence, used for batch Production | |
| 516. |
CNC machines are more economical to use even for simpie turning jobs. (T/F) |
| A. | False |
| B. | True |
| C. | T/F |
| D. | None of the above |
| Answer» B. True | |
| 517. |
CNC machines are more accurate than conventional machines because they have a high resolution encoder and digital readouts for positioning. (T/F) |
| A. | True |
| B. | False |
| C. | T/F |
| D. | None of the above |
| Answer» B. False | |
| 518. |
With reference to NC machine, which of the following statement is wrong? |
| A. | Both closed loop and open loop control systems are used |
| B. | Paper tapes, floppy drives and cassettes are used for data Storage |
| C. | Digitisers may be used as interactive input devices |
| D. | Post-processor is an item of hardware |
| Answer» E. | |
| 519. |
The most common limit gauge used for inspecting the hole diameter is |
| A. | Plug gauge |
| B. | Master gauge |
| C. | Snap gauge |
| D. | Ring gauge |
| Answer» B. Master gauge | |
| 520. |
Outside diameter of bush is turned using a mandrel. The mandrel diameter is maintained as 0.000 0.050 30.000 |
| A. | 0.050 |
| B. | 0.100 |
| C. | 0.020 |
| D. | 0.025 |
| Answer» B. 0.100 | |
| 521. |
A circular shaft having diameter 65.00 |
| A. | 65.01 |
| B. | 64.95 |
| C. | 65.12 |
| D. | 65.10 |
| Answer» D. 65.10 | |
| 522. |
The height (in mm) for a 125 mm sine bar to 'measure a taper of 27'32' on a flat work piece is _________(correct to three decimal places). |
| A. | 57.782 mm |
| B. | 7.782 mm |
| C. | 27.782 mm |
| D. | None of these |
| Answer» B. 7.782 mm | |
| 523. |
A cylindrical pin of 25 |
| A. | 9.030 mm. |
| B. | 2.030 mm. |
| C. | 29.030 mm. |
| D. | 11.030 mm. |
| Answer» D. 11.030 mm. | |
| 524. |
For tool A, Taylor's tool life exponent (n) is 0.45 and constant (K) is 90. Similarly for tool B, n = 0.3 and K = 60. The cutting speed (in 'm/ min) above which tool A will have a higher tool life than tool B is |
| A. | 26.7 |
| B. | 42.5 |
| C. | 80.7 |
| D. | 142.9 |
| Answer» B. 42.5 | |
| 525. |
The percentage of total energy dissipated due to friction at the tool-chip interface is |
| A. | 30% |
| B. | 42% |
| C. | 58% |
| D. | 70% |
| Answer» B. 42% | |
| 526. |
Two tools P and Q have signatures 5 -50-60-6 - 8 -30 -0 and 5 -5 -7 -7 -8 -15 -0 (both ASA) respectively. They are used to turn components under the same machining conditions. If hp and hQ denote the peak-to-valley heights of surfaces produced by the tools P and Q, the ratio h |
| A. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> tan 8 + cot15 </center></td></tr><tr><td style="text-align: center;">tan8 + cot30 </td></tr></table> |
| B. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center> tan15 + cot8 </center></td></tr><tr><td style="text-align: center;">tan30 + cot8 </td></tr></table> |
| C. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>tan15 + cot7 </center></td></tr><tr><td style="text-align: center;">tan30 + cot7 </td></tr></table> |
| D. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>tan7 + cot15 </center></td></tr><tr><td style="text-align: center;">tan7 + cot30 </td></tr></table> |
| Answer» C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>tan15 + cot7 </center></td></tr><tr><td style="text-align: center;">tan30 + cot7 </td></tr></table> | |
| 527. |
A 600 mm x 30 mm flat surface of a plate is to be finish machined on a shaper. The plate has been fixed with the 600 mm side along the tool travel direction. If the tool over-travel at each end of the plate is 20 mm, average cutting speed is 8 m/min, feed rate is 0.3 mm/stroke and the ratio of return time to cutting time of the tool is 1: 2, the time required for machining will be |
| A. | 8 minutes |
| B. | 12 minutes |
| C. | 16 minutes |
| D. | 20 minutes |
| Answer» C. 16 minutes | |
| 528. |
In a machining operation, doubling the cutting speed reduces the tool life to 1/8th of the original value. The exponent n in Taylor's tool life equation VT |
| A. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">8</td></tr></table> |
| B. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">4</td></tr></table> |
| C. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">3</td></tr></table> |
| D. | <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">2</td></tr></table> |
| Answer» D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>1</center></td></tr><tr><td style="text-align: center;">2</td></tr></table> | |
| 529. |
In an orthogonal cutting test on mild Steel, the following data were obtained |
| A. | 26.6 |
| B. | 31.5 |
| C. | 45 |
| D. | 63.4 |
| Answer» C. 45 | |
| 530. |
A copper strip of 200 mm width and 300 mm thickness is to be rolled to a thickness of 295 mm. The roll of radius 300 mm rotates at 100 rpm. The average shear strength of the work material is 180 MPa. The roll strip contact length and the roll force are |
| A. | 15.8 mm and 0.569 MN |
| B. | 18.97 mm 0.683 MN |
| C. | 38.73 mm and 1.395 MN |
| D. | 38.73 mm and 2.09 |
| Answer» D. 38.73 mm and 2.09 | |
| 531. |
In order to reduce roll pressure in strip rolling, back tension can be applied to strip. (T/F) |
| A. | T |
| B. | F |
| C. | T or F |
| D. | None of these |
| Answer» B. F | |
| 532. |
The thickness of a plate is reduced from 30 mm to 10 mm by successive cold rolling passes using identical rolls of diameter 600 mm. Assume that there is no change in width. If the coefficient of friction between the rolls and the workpiece is 0.1, the minimum number of passes required is |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» E. | |
| 533. |
In a rolling process, the roll separating force can be decreased by |
| A. | Reducing the roller diameter |
| B. | Increasing friction between the rolls and the metal |
| C. | Reducing front tension to rolled material |
| D. | Providing back up rollers |
| Answer» B. Increasing friction between the rolls and the metal | |
| 534. |
In a rolling process, thickness of a strip is reduced from 4 mm to 3 mm using 300 mm diameter rolls rotating at 100 rpm. The velocity of the strip (in m/sec) at the neutral point is |
| A. | 1.57 |
| B. | 3.14 |
| C. | 47.10 |
| D. | 94.20 |
| Answer» B. 3.14 | |
| 535. |
The maximum possible percentage reduction in area per pass during wire drawing of an ideal plastic material without friction is of the order of |
| A. | 37 |
| B. | 50 |
| C. | 63 |
| D. | 75 |
| Answer» D. 75 | |
| 536. |
A test specimen is stressed slightly beyond the yield point and then unloaded. Its yield strength |
| A. | Decreases |
| B. | Increases |
| C. | remains same |
| D. | become equal to UTS |
| Answer» C. remains same | |
| 537. |
The true sliding strain for a low carbon Steel bar which is doubled in length by forging is |
| A. | 0.307 |
| B. | 0.5 |
| C. | 0.693 |
| D. | 1.0 |
| Answer» D. 1.0 | |
| 538. |
In forging operation the sticking friction condition occurs near the... (centre/ends) |
| A. | ends |
| B. | centre |
| C. | A and B |
| D. | None of these |
| Answer» C. A and B | |
| 539. |
In a single point turning operation with cemented carbide tool and steel work piece, it is found that the Taylor's exponent is 0.25. If the cutting speed is reduced by 50% then the tool life changes by _______ times. |
| A. | 6 |
| B. | 2 |
| C. | 10 |
| D. | 16 |
| Answer» E. | |
| 540. |
In a sheet metal of 2 mm thickness a hole of 10 mm diameter needs to be punched. The yield strength in tension of the sheet material is 100 MPa and its ultimate shear strength is 80 MPa. The force required to punch the hole (in kN) is |
| A. | 5.026 |
| B. | 8.026 |
| C. | 5.028 |
| D. | 19.08 |
| Answer» B. 8.026 | |
| 541. |
Ductility of material with work hardening |
| A. | Increases |
| B. | Decreases |
| C. | Remains same |
| D. | Unpredictable |
| Answer» C. Remains same | |
| 542. |
In producing a punched hole of 20 mm diameter the dimensions of the punch is _______ given the radial die clearance of 0.1 mm. |
| A. | Hole is inner profile so outer blade should be exact. |
| B. | Hole is inner profile so outer blade should not be exact. |
| C. | A & B |
| D. | None of the above |
| Answer» F. | |
| 543. |
In blanking operation, the best way to improve the smoothness and secureness of the edges is to |
| A. | have reduced gap between punch and die |
| B. | increase the ductility of the sheet |
| C. | decrease the speed of blanking |
| D. | provide shear on the punch |
| Answer» B. increase the ductility of the sheet | |
| 544. |
In... A... operation the diameter of the desired hole will be smaller than the diameter of the... B... |
| A. | A |
| B. | B |
| C. | A and B |
| D. | None of the above |
| Answer» B. B | |
| 545. |
In a DC arc welding operation, the voltage-arc length characteristic was obtained as V |
| A. | 45 V, 450 A |
| B. | 75 V, 750 A |
| C. | 95 V, 950 A |
| D. | 150 V, 1500 A |
| Answer» D. 150 V, 1500 A | |
| 546. |
In arc welding of a butt joint, the welding speed is to be selected such that highest cooling rate is achieved. Melting efficiency and heat transfer efficiency are 0.5 and 0.7, respectively. The area of the weld cross section is 5 mm |
| A. | 4 |
| B. | 14 |
| C. | 24 |
| D. | 34 |
| Answer» C. 24 | |
| 547. |
A direct current welding machine with a linear power source characteristic provides open circuit voltage of 80 V and short circuit current of 800 A. During welding with the machine, the measured arc current is 500 A corresponding to an arc length of 5.0 mm and the measured arc current is 460 A corresponding to an arc length of 7.0 mm. |
| A. | E = 20 + 2L |
| B. | E = 20 + 8L |
| C. | E = 80 + 2L |
| D. | E = 80 + 8L |
| Answer» B. E = 20 + 8L | |
| 548. |
The voltage-length characteristic of a direct arc in an arc welding process is V = (100 + 40l), where l is the length of the arc in mm and V is arc voltage in volts. During a welding operation, the arc length varies between 1 and 2 mm and the welding current is in the range 200-250 A. Assuming a linear power source, the short circuit current is ____ A. |
| A. | 324.6 |
| B. | 424.6 |
| C. | 265.6 |
| D. | None of these |
| Answer» C. 265.6 | |
| 549. |
Through holes of 10 mm diameter are to be drilled in a steel plate of 20 mm thickness. Drill spindle speed is 300 rpm, feed 0.2 mm/rev and drill point angle is 120 . Assuming drill over travel of 2 mm, the time for producing a hole will be |
| A. | 4 seconds |
| B. | 25 seconds |
| C. | 100 seconds |
| D. | 110 seconds |
| Answer» C. 100 seconds | |
| 550. |
The voltage arc length characteristics of a DC arc is given by V = 20 + 40L, where L = arc length in cm. The power source characteristics can be approximated by a straight line. Open circuit is 80 V and short circuit current 1000 Amps. The optimum arc length in mm |
| A. | 0.5 |
| B. | 1 |
| C. | 5 |
| D. | 10 |
| Answer» D. 10 | |