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.
| 51. |
Assertion (A): In electron beam welding process, vacuum is an essential process parameter. Reason (R): Vacuum provides a highly efficient shield on weld zone. |
| 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 |
| Answer» D. A is false but R is true | |
| 52. |
One brand of milling machining has the following two index plates supplied along with the indexing head. Plate 1: 15, 16, 17, 18, 19, 20 hole circles. Plate 2: 21, 23, 27, 29, 31, 33 hole circles. It is proposed to mill a spur gear of 28 teeth using simple indexing method. Which one of the following combinations of index plate and number of revolutions is correct? |
| A. | Plate 1: 1 revolution and 9 holes in 18 hole circles |
| B. | Plate 2 :1 revolution and 9 holes in 21 hole circles |
| C. | Plate 2 :1 revolution and 9 holes in 23 hole circles |
| D. | Plate 1 :1 revolution and 9 holes in 15 hole circles |
| Answer» C. Plate 2 :1 revolution and 9 holes in 23 hole circles | |
| 53. |
The cold cracking susceptibility of the heat affected zone in an arc weld is influenced by P. Entrapped hydrogen Q. Residual stresses R. Martensitically transformation S. Slag inclusion |
| A. | P and S |
| B. | P, Q and S |
| C. | P, Q and R |
| D. | R and S |
| Answer» D. R and S | |
| 54. |
Match the following Welding Process A. Thermit welding B. Projection welding C. MIG welding D. Friction welding Heat Source1. Electric arc 2. Mechanical work 3. Exothermic Chemical reaction 4. Ohmic resistance |
| A. | A - 3, B - 4, C - 2, D - 1 |
| B. | A - 1, B - 4, C - 2, D - 3 |
| C. | A - 4, B - 3, C - 2, D - 1 |
| D. | A - 3, B - 2, C - 4, D - 1 |
| Answer» B. A - 1, B - 4, C - 2, D - 3 | |
| 55. |
Match the following List-I A. Cellulose coating B. Rutile coating C. Iron powder coating D. Basic coating List-II1. Alloying agent 2. Absorb gasses 3. Forming slag 4. Shielding gasses |
| A. | A - 4, B - 3, C - 1, D - 2 |
| B. | A - 2, B - 3, C - 1, D - 4 |
| C. | A - 4, B - 1, C - 3, D - 2 |
| D. | A - 3, B - 4, C - 1, D - 2 |
| Answer» B. A - 2, B - 3, C - 1, D - 4 | |
| 56. |
The operation in which oil is permeated into the pores of a powder metallurgy product is known as |
| A. | mixing |
| B. | sintering |
| C. | impregnation |
| D. | infiltration |
| Answer» D. infiltration | |
| 57. |
Match the following Process P. Green sand moulding Q. Shell moulding R. Investment moulding S. Ceramic moulding Mould making technique 1. Pouring 2. Dipping 3. Compaction 4. Resin bonding |
| A. | P 3, a 4, R 2, S1 |
| B. | P 4, a 3, R 2, S1 |
| C. | P 1, a 4, R 2, S3 |
| D. | P 2, a 4, R 3, S1 |
| Answer» B. P 4, a 3, R 2, S1 | |
| 58. |
Two identical cylindrical jobs are turned using (a) a round nosed tool of nose radius 2 mm and (b) a sharp corner tool having principal cutting edge angle = 45 and auxiliary cutting edge angle = 10 . If the operation is carried out of the feed of 0.08 mm/rev, the height at micro irregularities on the machined surfaces (in mm) in the two cases will be |
| A. | 0.0001, 0.024 |
| B. | 0.0002, 0.012 |
| C. | 0.0003, 0.024 |
| D. | 0.0004, 0.012 |
| Answer» E. | |
| 59. |
Tool life equations for two tools under consideration are as follows HSS: VT0.2 = 150 Carbide: VT0.3 = 250 Where V is the cutting speed in m/min and T is the tool life in mm. The breakeven cutting speed above which the carbide tool will be beneficial is |
| A. | 54 m/min |
| B. | 150 m/min |
| C. | 194 m/min |
| D. | 250 m/min |
| Answer» B. 150 m/min | |
| 60. |
Match the following Process ProcessDefectA. Casting1. Lack of penetrationB. Welding2. PenetrationC. Extrusion3. Flange wrinklesD. Deepdrawing4. Centre burst |
| A. | A 3, B 2, C 4, D 1 |
| B. | A 1, B 2, C 4, D 3 |
| C. | A 1, B 3, C 4, D 2 |
| D. | A 1, B 3, C 4, D 2 |
| Answer» C. A 1, B 3, C 4, D 2 | |
| 61. |
Machining process job List-I A. LBM B. EDM C. Chemical milling D. USM List-II 1. Making a printed circuit board 2. Drilling a hole in glass plate 3. Making a die out of a die steel block 4. Cutting a polyester sheet |
| A. | A 2, B 3, C 1, D 4 |
| B. | A 4, B 2, C 1, D 3 |
| C. | A 4, B 2, C 1, D 3 |
| D. | A 4, B 3, C 1, D 2 |
| Answer» E. | |
| 62. |
Manufacturing process A. Hot tears B. Porosity C. Sand inclusions D. Shrinkage cavity Property 1. Mould restraint 2. Inadequate risering 3. High pouring temp 4. Loosely rammed sand mould 5. Gas entrapment |
| A. | A 1, B 5, C 4, D 2 |
| B. | A 2, B 5, C 4, D 1 |
| C. | A 4, B 5, C 1, D 2 |
| D. | A 1, B 4, C 5, D 2 |
| Answer» B. A 2, B 5, C 4, D 1 | |
| 63. |
A metal rod of initial length L0 is subjected to a drawing process. The length of the rod at any instant is given by the expression, L(t) = L0 (1 + t ), where t is the time in minutes. The true strain rate (in min 1) at the end of one minute is _______. |
| A. | 1 min |
| B. | 2 min |
| C. | 3 min |
| D. | 4 min |
| Answer» B. 2 min | |
| 64. |
A steel wire is drawn from an initial diameter (di) of 10 mm to a final diameter (df) of 7.5 mm. The half cone angle ( ) of the die is 5 and the coefficient of friction ( ) between the die and the wire is 0.1. The average of the initial and final yield stress [( y )avg] is 350 MPa. The equation for drawing stress f. (in MPa) is given as: The drawing stress (in MPa) required to carry out this operation is (correct to two decimal places). |
| A. | 316.25 MPa |
| B. | - 316.25 MPa |
| C. | 314.25 MPa |
| D. | 315.25 MPa |
| Answer» B. - 316.25 MPa | |
| 65. |
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 |
| A. | 0.865 |
| B. | 0.826 |
| C. | 0.777 |
| D. | 0.632 |
| Answer» E. | |
| 66. |
The true stress (in MPa) versus true strain relationship for a metal is given by = 1020 0.4 The cross-sectional area at the start of a test (when the stress and strain values are equal to zero) is 100 mm . The cross-sectional area at the time of necking (in mm ) is _____(correct to two decimal places). |
| A. | 67.032 mm |
| B. | - 67.032 mm |
| C. | 68.032 mm |
| D. | 66.032 mm |
| Answer» B. - 67.032 mm | |
| 67. |
Match the processes with their characteristics. ProcessesCharacteristicsP. Electrical1. No residual Discharge Machining stressQ. Ultrasonic machining2. Machining of electrically conductive materialsR. Chemical machining3. Machining of glassS. Ion Beam Machining4. Nanomachining |
| A. | P-2, Q-3, R-1, S-4 |
| B. | P-3, Q-2, R-1, S-4 |
| C. | P-3, Q-2, R-4, S-1 |
| D. | P-2, Q-4, R-3, S-1 |
| Answer» B. P-3, Q-2, R-1, S-4 | |
| 68. |
During the execution of a CNC part program blockNO20 GO2 X45.0 Y25.0 R5.0 the type of tool motion will be |
| A. | circular Interpolation - clockwise |
| B. | circular Interpolation - counterclockwise |
| C. | linear Interpolation |
| D. | rapid feed |
| Answer» B. circular Interpolation - counterclockwise | |
| 69. |
In an interchangeable assembly,a shaft of 20+0.015-0.05 mm diameter and a hole of +0.025-0.010 mm diameter form a mating pair. In the worst assembly conditions, clearance between them will be |
| A. | 40 microns |
| B. | 30 microns |
| C. | 25 microns |
| D. | 15 microns |
| Answer» C. 25 microns | |
| 70. |
Match the following A. Sand casting B. Plaster mould casting C. Shell mould casting D. Investment casting 1. Symmetrical and circular shapes only 2. Parts have hardened skins and soft interior 3. Minimum post casting process 4. Parts have soft skin and hard interior 5. Parts have a tendency to warp 6. Suitable only for nonferrous metals |
| A. | A 4, B 6, C 2, D 2 |
| B. | A 5, B 6, C 2, D 3 |
| C. | A 5, B 3, C 2, D 6 |
| D. | A 4, B 6, C 2, D 1 |
| Answer» C. A 5, B 3, C 2, D 6 | |
| 71. |
Only 4 pairs can be matched Casting process A. Investment casting B. Die casting C. Centrifugal casting D. Drop forging E. Extrusion F. Shell moulding Product 1. Turbine rotors 2. Turbine blades 3. Connecting rods 4. Galvanized iron pipes 5. Cast iron pipes 6. Carburetor body |
| A. | A 4, B 3, C 2, D 5 |
| B. | A 2, B 3, C 2, D 5 |
| C. | A 1, B 3, C 2, D 4 |
| D. | A 2, B 5, C 2, D 1 |
| Answer» C. A 1, B 3, C 2, D 4 | |
| 72. |
A cast iron block of 200 mm length is being shaped in a shaping machine with a depth of cut of 4 mm, feed of 0.25 mm/stroke and the tool principal cutting edge angle of 30 . Number of cutting strokes per minute is 60. Using specific energy for cutting as 1.49 J/mm3, the average power consumption (in watt) is __________ . |
| A. | 290 |
| B. | 198 |
| C. | 298 |
| D. | 398 |
| Answer» D. 398 | |
| 73. |
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 |
| A. | P and R |
| B. | P and S |
| C. | Q and R |
| D. | Q and S |
| Answer» E. | |
| 74. |
Under certain cutting conditions, doubling the cutting speed reduces the tool life to (1/16)th of the original. Taylor's tool life index(n) for this tool- work piece combination will be ________. |
| A. | 0.25 |
| B. | 0.29 |
| C. | 0.27 |
| D. | 0.35 |
| Answer» B. 0.29 | |
| 75. |
An orthogonal turning operation is carried out under the following conditions; rake angle = 5 , spindle rotational speed = 400 rpm; axial feed = 0.4 m/min and radial depth of cut = 5 mm. The chip thickness tc, is found to be 3 mm. The shear angle (in degree) in this turning process is______. |
| A. | 19.88 |
| B. | 18.80 |
| C. | 18.88 |
| D. | 18.99 |
| Answer» D. 18.99 | |
| 76. |
For a certain job, the cost of metal cutting is Rs. 180 C/V and the cost of tooling is Rs. 270 C/ (TV), where C is a constant, V is the cutting speed in m/min and T is the tool life in minutes. The Taylor's tool life equation is VT0.25 = 150. The cutting speed (in m/min) for the minimum total cost is________. |
| A. | 93.2 |
| B. | 93.9 |
| C. | 93.5 |
| D. | 93.3 |
| Answer» B. 93.9 | |
| 77. |
The tool life equation for HSS tool is VT0.14f0.7d0.4 = Constant. The tool life (T) of 30 min is obtained using the following cutting conditions: V= 45 m/min, f = 0.35 mm, d =2.0 mm. If speed (V), feed (f) and depth of cut (d) are increased individually by 25%, the tool life (in min) is |
| A. | 0.15 |
| B. | 1.06 |
| C. | 22.50 |
| D. | 30.0 |
| Answer» C. 22.50 | |
| 78. |
Casting process A. Slush casting B. Shell moulding C. Dry sand moulding D. Centrifugal casting Product 1. Turbine blade 2. Machine tool bed 3. Cylindrical block 4. Hollow castings like lamp shades 5. Rain water pipes 6. Cast iron shoe brake |
| A. | A 5, B 3, C 2, D 4 |
| B. | A 4, B 5, C 2, D 3 |
| C. | A 4, B 3, C 2, D 5 |
| D. | A 2, B 5, C 4, D 3 |
| Answer» D. A 2, B 5, C 4, D 3 | |
| 79. |
Internal gear cutting operation can be performed by |
| A. | milling |
| B. | shaping with rack cutter |
| C. | shaping with pinion cutter |
| D. | hobbing |
| Answer» D. hobbing | |
| 80. |
Grinding ratio is defined as Volume of wheel wear |
| A. | |
| B. | |
| C. | |
| Answer» C. | |
| 81. |
Trepanning is performed for |
| A. | Finishing a drilled hole |
| B. | producing a large hole without drilling |
| C. | truing a hole for alignment |
| D. | enlarging a drilled hole |
| Answer» C. truing a hole for alignment | |
| 82. |
Consider the following statements: The helical flute in a twist drill provides the necessary 1. Clearance angle for the cutting edge. 2. Rake angle for the cutting edge. 3. Space for the chip to come out during drilling. 4. Guidance for the drill to enter into the work piece. Which of the statements given above are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 83. |
Match the following Manufacturing process A. Finish turning B. Forming C. Thread cutting D. Down milling Conditions 1. Backlash eliminator 2. Zero rake 3. Nose radius 4. Low speed |
| A. | A 3, B 4, C 2, D 1. |
| B. | A 3, B 4, C 1, D 2. |
| C. | A 1, B 4, C 2, D 3. |
| D. | A 3, B 2, C 1, D 4. |
| Answer» D. A 3, B 2, C 1, D 4. | |
| 84. |
Two cutting tools with tool life equations given below are being compared: Tool 1: VT0.1 = 150 Tool 2: VT0.3 = 300 where V is cutting speed in m/minute and T is tool life in minutes. The break even cutting speed beyond which Tool 2 will have a higher tool life is ________ m/minute. |
| A. | 106.66 |
| B. | 106.99 |
| C. | 106.88 |
| D. | 106.77 |
| Answer» B. 106.99 | |
| 85. |
An expendable pattern is used in |
| A. | slush casting |
| B. | squeeze casting |
| C. | centrifugal casting |
| D. | Investment casting |
| Answer» D. Investment casting | |
| 86. |
Match the items of List-I (Equipment) with the items of List-II (Process) the correct answer using the given codes. Equipment P. Hot chamber machine Q. Muller R. Dielectric baker S. Sand blaster Process 1, Cleaning 2. Core making 3, Die casting 4. Annealing and mixing |
| A. | P-2, Q-1, R-4, S-6 |
| B. | P-4, Q-2, R-3, S-5 |
| C. | P-4, Q-5, R-1, S-2 |
| D. | P-3, Q-5, R-2, S-1 |
| Answer» D. P-3, Q-5, R-2, S-1 | |
| 87. |
To stress relieve a cold worked steel part, it is heated to a temperature close to.... A... and grain obtained after cooling are... B. A. lower critical temperature/upper critical temp B. fine/coarser |
| A. | A-upper critical temp B-coarser |
| B. | A-lower critical temperature B-causer |
| C. | A-upper critical temp B-fine |
| D. | None of these |
| Answer» B. A-lower critical temperature B-causer | |
| 88. |
Production process application List-I A. Extrusion B. Hot forging C. Metal spinning D. Explosive welding List-II 1. Cladding of noble metal to base metal 2. Long continuous metal tubes 3. Connecting rod of IC engine 4. Long flanged pipes 5. House hold utensils. |
| A. | A 2 B 3 C 5 D 1 |
| B. | A 2 B 3 C 5 D 4 |
| C. | A 2 B 3 C 4 D 5 |
| D. | A 2 B 4 C 5 D 1 |
| Answer» D. A 2 B 4 C 5 D 1 | |
| 89. |
Consider the following steps in forging a connecting rod from the bar stock 1. blocking 2. trimming 3. finishing 4. edging Select the correct sequence of these operations using the codes given below: |
| A. | 1-2-3-4 |
| B. | 2-3-4-1 |
| C. | 3-4-1-2 |
| D. | 4-1-3-2 |
| Answer» E. | |
| 90. |
Cold working produces the following effects 1. Stresses are set up in the material 2. Grain structure get distorted 3. Strength and hardness of the metal are increased 4. Surface finish is reduced |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» B. 1, 2 and 3 | |
| 91. |
Match the casting defects (Group A) with the probable causes (Group B): Group-A P. Hot tears Q. Shrinkage R. Blow holes S. Cold shunt Group-B 1. Improper fusion of two streams of liquid metal 2. Low permeability of the sand mould 3. Volumetric contraction both in liquid and solid stage 4. Differential cooling rate |
| A. | P-1, Q-3, R-2, S-4 |
| B. | P-4, Q-3, R-2, S-1 |
| C. | P-3, Q-4, R-2, S-1 |
| D. | P-1, Q-4, R-4, S-3 |
| Answer» C. P-3, Q-4, R-2, S-1 | |
| 92. |
A sprue in a sand mould has a top diameter of 20 mm and height of 200 mm. The velocity of the molten metal at the entry of the sprue is 0.5 m/s. Assume acceleration due to gravity as 9.8 m/s2 and neglect all losses, If the mould well ventilated, the velocity (upto 3 decimal points accuracy) of the molten metal at the bottom of the sprue is ______ m/s. |
| A. | 2.034 |
| B. | 3.043 |
| C. | 2.043 |
| D. | 2.045 |
| Answer» D. 2.045 | |
| 93. |
An annealed copper wire of 25 mm diameter is drawn into a wire of 5 mm diameter. The average yield stress in this operation if the curve of the material is given, = 315 0.54 MPa |
| A. | 592 MPa |
| B. | 458 MPa |
| C. | 342 MPa |
| D. | None of these |
| Answer» B. 458 MPa | |
| 94. |
Assertion (A): Cold working of metals results in increase of strength and hardness. Reason (R): Cold working reduce the total number of dislocations per unit volume of the material |
| 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 |
| Answer» D. A is false but R is true | |
| 95. |
Consider the following statements: In comparison to hot working, in cold working, 1. higher forces are required 2. no heating is required 3. less ductility is required 4. better surface finish is obtained. Which of the statements given above are correct? |
| A. | 1,2 and 3 |
| B. | 1, 2 and 4 |
| C. | 1 and 3 |
| D. | 2, 3 and 4 |
| Answer» C. 1 and 3 | |
| 96. |
The true stress true curve is given by = 1400 0.33, where the stress is in MPa. The true stress maximum load (in MPa) is |
| A. | 971 |
| B. | 750 |
| C. | 698 |
| D. | 350 |
| Answer» B. 750 | |
| 97. |
A lever having 90 bend is to be produced by drop forging using mild steel bar as raw material. The various operations to be performed on it during forging are: P-Cutting; Q-Bending: R-Fullering: S-Blocking cum finishing; T-Edging The correct sequence for performing the operation is |
| A. | PQRS |
| B. | RTQSP |
| C. | TRSQP |
| D. | RQTSP |
| Answer» C. TRSQP | |
| 98. |
Match the following List-I A. Welding of aluminium alloy B. Ship building C. Joining of HSS drill bit to shank D. Deep penetration precision welds List-II 1. Submerged arc welding 2. Electron beam welding 3. TIG welding 4. Friction welding 5. Gas welding |
| A. | A-3, B-1, C-4, D-2 |
| B. | A-1, B-3, C-4, D-2 |
| C. | A-3, B-5, C-4, D-2 |
| D. | A-3, B-1, C-4, D-5 |
| Answer» B. A-1, B-3, C-4, D-2 | |
| 99. |
Welding process A. Thermit welding B. Seam welding C. MIG welding D. Friction welding Heat source 1. Chemical reaction 2. Exothermic Chemical reaction 3. Electric spark 4. Ohmic resistance 5. Mechanical work 6. Electric arc |
| A. | A-2, B-4, C-6, D-5 |
| B. | A-2, B-4, C-1, D-5 |
| C. | A-2, B-4, C-6, D-3 |
| D. | A-2, B-4, C-6, D-1 |
| Answer» B. A-2, B-4, C-1, D-5 | |
| 100. |
Match the following Work material P. Aluminium Q. Die steel R. Copper Wire S. Titanium sheet Type of joining 1. Submerged Arc Welding 2. Soldering 3. Thermit Welding 4. Atomic Hydrogen Welding 5. Gas Tungsten Arc Welding 6. Laser Beam Welding |
| A. | P-2, Q-5, R-1, S-3 |
| B. | P-6, Q-3, R-4, S-4 |
| C. | P-4, Q-1, R-6, S-2 |
| D. | P-5, Q-4, R-2, S-6 |
| Answer» E. | |