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.
| 801. |
A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter between points (0, 0) and (100, 100) on-the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min. Milling time for the slot (in seconds) is |
| A. | 120 |
| B. | 170 |
| C. | 180 |
| D. | 240 |
| Answer» C. 180 | |
| 802. |
In a CNC program block, N002 G02 G91 X40 Z40..., G02 and G91 refer to |
| A. | circular interpolation in counterclockwise direction and incremental dimension |
| B. | circular interpolation in counterclockwise direction and absolute dimension |
| C. | circular interpolation in clockwise direction and incremental dimension |
| D. | circular interpolation in clockwise direction and absolute dimension |
| Answer» D. circular interpolation in clockwise direction and absolute dimension | |
| 803. |
An electrochemical machining (ECM) is to be used to cut a through hole into a 12 mm thick aluminium plate. The hole has a rectangular cross- section, 10 mm 30 mm. The ECM operation will be accomplished in 2 minutes, with efficiency of 90%. Assuming specific removal rate for aluminium as 3.44 10 |
| A. | 988 |
| B. | 962 |
| C. | 968.992 |
| D. | 868 |
| Answer» D. 868 | |
| 804. |
In an ultrasonic machining (USM) process, the material removal rate (MRR) is plotted as a function of the feed force of the USM tool. With increasing feed force, the MRR exhibits the following behavior: |
| A. | increases linearly |
| B. | decreases linearly |
| C. | does not change |
| D. | first increases and then decreases |
| Answer» E. | |
| 805. |
Which among the NC operations given below are continuous path operations? |
| A. | AW, LC and M |
| B. | AW, D, LC and M |
| C. | D, LC, P and SW |
| D. | D, LC, and SW |
| Answer» B. AW, D, LC and M | |
| 806. |
Slip gauges are calibrated by outside micrometer (T/F) |
| A. | True |
| B. | False |
| C. | NA |
| D. | NA |
| Answer» C. NA | |
| 807. |
In an interchangeable assembly, shafts of size 25.000 |
| A. | 40 |
| B. | 30 |
| C. | 20 |
| D. | 10 |
| Answer» D. 10 | |
| 808. |
Abrasive material used in grinding wheel selected for grinding ferrous alloys is |
| A. | SiC |
| B. | Diamond |
| C. | Al203 |
| D. | Boron carbide |
| Answer» D. Boron carbide | |
| 809. |
Component process |
| A. | A 5, B 6, C 1, D 3 |
| B. | A 5, B 5, C 2, D 3 |
| C. | A 1, B 6, C 2, D 3 |
| D. | A 5, B 6, C 2, D 3 |
| Answer» E. | |
| 810. |
In ECM, the metal removal rate is directly proportional to |
| A. | Density of work material |
| B. | Gram atomic weight of the work material |
| C. | Concentration of the electrolyte used |
| D. | Thermal conductivity of the work material |
| Answer» C. Concentration of the electrolyte used | |
| 811. |
A 10 mm square hole can be cut in a 2 mm thick glass plate by |
| A. | USM |
| B. | EDM |
| C. | LBM |
| D. | ECM |
| Answer» B. EDM | |
| 812. |
In an orthogonal machining operation, the tool life obtained is 10 min at a cutting speed of 100 m/min, while at 75 m/min cutting speed, the tool life is 30 min. The value of index (n) in the Taylor's tool life equation is |
| A. | 0.262 |
| B. | 0.323 |
| C. | 0.423 |
| D. | 0.521 |
| Answer» B. 0.323 | |
| 813. |
Chip speed along the tool rake face will be |
| A. | 0.83 m/s |
| B. | 0.53 m/s |
| C. | 1.2 m/s |
| D. | 1.88 m/s |
| Answer» C. 1.2 m/s | |
| 814. |
Two pipes of inner diameter 100 mm and outer diameter 110 mm each are joined by flash butt welding using 30 V power supply. At the interface, 1 mm of material melts from each pipe which has a resistance of 42.4 ohms. If the unit melt energy is 64.4 MJ/m3, then time required for welding (in s) is |
| A. | 1 |
| B. | 5 |
| C. | 10 |
| D. | 20 |
| Answer» D. 20 | |
| 815. |
Two metallic sheets, each of 2.0 mm thickness, are welded in a lap joint configuration by resistance spot welding at a welding current of 10 kA and welding time of 10 millisecond. A spherical fusion zone extending up to the full thickness of each sheet is formed and properties of the metallic sheets are given as: Ambient temperature = 293 K Melting temperature = 1793 K Density = 7000 kg/m Latent heat of fusion = 300 kJ/kg Specific heat = 800 J/kgK. Assume: |
| A. | 50.37 |
| B. | 60.37 |
| C. | 70.37 |
| D. | 80.37 |
| Answer» D. 80.37 | |
| 816. |
For resistance spot welding of 1.5 mm thick steel sheets, the current required is of the order |
| A. | 10 Amp |
| B. | 100 Amp |
| C. | 1000 Amp |
| D. | 10,000 Amp |
| Answer» E. | |
| 817. |
The DC power source for are welding has the characteristic 3V + I = 240, where V = Voltage and I = Current in amp. For maximum are power at the electrode, voltage should be set at |
| A. | 20 V |
| B. | 40 V |
| C. | 60 V |
| D. | 80 V |
| Answer» C. 60 V | |
| 818. |
In spot pulsed laser welding of aluminum plates (density = 2700 kg/m , specific heat = 896 J/kg, melting temperature = 933 K, latent heat of melting = 398 kJ/kg) at a temp of 30 C, pulse with energy of 0.5 J is focused onto an area of 0.05 mm . If the entire energy is coupled into the material, what will be the depth of weld assuming the cross sectional area of the weld is circular and is uniform throughout its depth and only heat conduction in the direction of penetration. |
| A. | 5.34 mm |
| B. | 2.15 mm |
| C. | 4.23 mm |
| D. | 3.85 mm |
| Answer» E. | |
| 819. |
If the cutting force and the thrust force are 900 N and 810 N, the mean strength in MPa |
| A. | 137.94 |
| B. | 477.91 |
| C. | 500.58 |
| D. | 635.84 |
| Answer» C. 500.58 | |
| 820. |
The shear angle is |
| A. | 14 |
| B. | 25 |
| C. | 29 |
| D. | 75 |
| Answer» D. 75 | |
| 821. |
Two different tools A and B having nose radius of 0.6 mm and 0.33 mm respectively are used to machine C-45 steel employing feed rate of 0.2 mm/rev and 0.1 mm/rev respectively. The tool that gives better finish and the value of ideal surface roughness are |
| A. | Tool A and 4.166 respectively |
| B. | Tool B and 3.78 m respectively |
| C. | Tool A and 8.333 m respectively |
| D. | Tool B and 8.333 m respectively |
| Answer» C. Tool A and 8.333 m respectively | |
| 822. |
Which of the following arc welding processes does not use consumable electrode |
| A. | GMAW |
| B. | GTAW |
| C. | SAW |
| D. | None |
| Answer» C. SAW | |
| 823. |
Wood flour is added to core sand to improve |
| A. | Collapsibility of core |
| B. | Dry strength of core |
| C. | Shear strength of core |
| D. | Tolerance on casting |
| Answer» B. Dry strength of core | |
| 824. |
Given the atomic weight of Fe is 56 and that of C is 12, the weight percentage of carbon in cementite (Fe |
| A. | 68.7% |
| B. | 66.7% |
| C. | 70.7% |
| D. | 96.7% |
| Answer» C. 70.7% | |
| 825. |
In sand casting process, a sphere and a cylinder of equal volumes are separately cast from the sand molten metal under identical conditions. The height and diameter of the cylinder are equal. The ratio of the solidification time of the sphere to that of the cylinder is |
| A. | 1.14 |
| B. | 0.87 |
| C. | 1.31 |
| D. | 0.76 |
| Answer» B. 0.87 | |
| 826. |
During the filling process of a given sand mould cavity by molten metal through a horizontal runner of circular C.S, the frictional head loss of the molten metal in the runner will increase with the |
| A. | Increase in runner diameter |
| B. | Decrease internal surface roughness of the runner |
| C. | Decrease in length of runner |
| D. | Increase in average velocity of molten metal |
| Answer» D. Increase in average velocity of molten metal | |
| 827. |
A solid cylinder of diameter D and height equal to D, and a solid cube of side L are being sand cast by using the same material. Assuming there is no superheat in both the cases, the ratio of solidification times of the cylinder to the solidification time of the cube is |
| A. | (L/D) |
| B. | (2L/D) |
| C. | (2D/L) |
| D. | (D/L) |
| Answer» D. (D/L) | |
| 828. |
Cold shut is a defect in casting due to |
| A. | sand sliding from the cope surface |
| B. | internal voids or surface depression due to excessive gas trapped |
| C. | discontinuity resulting from hundred contraction |
| D. | two streams of material that are too cold to fuse properly |
| Answer» B. internal voids or surface depression due to excessive gas trapped | |
| 829. |
Match the following products with preferred manufacturing processes: |
| A. | P-4, Q-3, R-1, S-2 |
| B. | P-4, Q-3, R-2, S-1 |
| C. | P-2, Q-4, R-3, S-1 |
| D. | P-3, Q-4, R-2, S-1 |
| Answer» C. P-2, Q-4, R-3, S-1 | |
| 830. |
The force requirement in a blanking operation of low carbon steel sheet is 5.0 kN. The thickness of the sheet is 't' and diameter of the blanked part is 'd'. For the same work material, if the diameter of the blanked part is increased to 1.5d and thickness is reduced to 0.4t, the new blanking force in kN is |
| A. | 3.0 |
| B. | 4.5 |
| C. | 6.7 |
| D. | 0.8 |
| Answer» B. 4.5 | |
| 831. |
Circular blanks of 10 mm diameter are punched from an aluminum sheet of 2 mm thickness. The shear strength of aluminum is 80 MPa. The minimum punching force required in kN is |
| A. | 2.57 |
| B. | 3.29 |
| C. | 5.03 |
| D. | 6.33 |
| Answer» D. 6.33 | |
| 832. |
A blank of 50 mm diameter is to be sheared from a sheet of 2.5 mm thickness. The required radial clearance between the die and the punch is 6% of sheet thickness. The punch and die diameter (mm) for this blanking operation respectively are |
| A. | 50.00 and 50.30 |
| B. | 50.00 and 50.15 |
| C. | 49.70 and 50.00 |
| D. | 49.85 and 50.00 |
| Answer» D. 49.85 and 50.00 | |
| 833. |
In Electrodischarge Machining (EDM), if the thermal conductivity of tools is high and the specific heat of work piece is low, then the tool wear rate and material removal rate are expected to be respectively |
| A. | high and high |
| B. | low and low |
| C. | high and low |
| D. | low and high |
| Answer» E. | |
| 834. |
It is required to punch a hole of diameter 10 mm on a sheet of thickness 3 mm. The shear strength of the work material is 420 MPa. The required punch force is |
| A. | 19.78 kN |
| B. | 39.58 kN |
| C. | 98.9 kN |
| D. | 359.6 kN |
| Answer» C. 98.9 kN | |
| 835. |
For the given assembly: 25 H78g8, match Group A with Group B |
| A. | P I, Q III, R IV, S II |
| B. | P I, Q IV, R III, S II |
| C. | P II, Q III, R IV, S I |
| D. | P II, Q IV, R III, S I |
| Answer» E. | |
| 836. |
Match the following products with the suitable manufacturing process |
| A. | P-4,Q-3,R-1,S-2 |
| B. | P-2, Q-1, R-3, S-4 |
| C. | P-4, Q-1, R-2, S-3 |
| D. | P-1, Q-3, R-4, S-2 |
| Answer» D. P-1, Q-3, R-4, S-2 | |
| 837. |
Cylindrical pins of 25 |
| A. | 25.042 |
| B. | 25.052 |
| C. | 25.074 |
| D. | 25.084 |
| Answer» E. | |
| 838. |
The coefficient of friction at the tool-chip interface is |
| A. | 0.23 |
| B. | 0.46 |
| C. | 0.85 |
| D. | 0.95 |
| Answer» C. 0.85 | |
| 839. |
In turning operation the feed rate could be doubled to increase the metal removal rate. To keep the same level of surface finish, the nose radius of the tool has to be |
| A. | Doubled |
| B. | Halved |
| C. | Multiplied by 4 times |
| D. | Kept unchanged |
| Answer» D. Kept unchanged | |
| 840. |
The mode of metal transfer in CO |
| A. | Spray transfer |
| B. | Short circuiting type of transfer |
| C. | Globular transfer |
| D. | Droplet transfer |
| Answer» E. | |
| 841. |
Proper gating design in metal casting |
| A. | P, R |
| B. | Q, S |
| C. | R, S |
| D. | P, S |
| Answer» E. | |
| 842. |
A resistance-capacitance relaxation circuit is used in an electrical discharge machining process. The discharge voltage is 100 V. At a spark cycle time of 25 s, the average power input required is 1 kW. The capacitance (in F) in the circuit is |
| A. | 2.5 |
| B. | 5.0 |
| C. | 7.5 |
| D. | 10.0 |
| Answer» C. 7.5 | |
| 843. |
Powder metallurgical components have |
| A. | same density as that of cast products |
| B. | higher density than cast products |
| C. | lower density than cast products |
| D. | higher density than forged products |
| Answer» D. higher density than forged products | |