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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.
| 101. |
Match the CORRECT pairs ProcessesCharacteristics/ApplicationsP. Friction Welding1. Non-consumable electrodeQ. Gas Metal Arc welding2. Joining of thick platesR. Electroslag Welding3. Consumable electrode wireS. Tungsten Inert Gas welding4. Joining of cylindrical dissimilar materials |
| A. | P-4, Q-3, R-2, S-1 |
| B. | P-4, Q-2, R-3, S-1 |
| C. | P-2, Q-3, R-4, S-1 |
| D. | P-2, Q-4, R-1, S-3 |
| Answer» B. P-4, Q-2, R-3, S-1 | |
| 102. |
In a rolling process, the maximum possible draft, defined as the difference between the initial and the final thickness of the metal sheet, mainly depends on which pair of the following parameters? P: Strain Q: Strength of the work material R: Roll diameter S: Roll velocity T: Coefficient of friction between roll and work |
| A. | Q, S |
| B. | R, T |
| C. | S, T |
| D. | P, R |
| Answer» C. S, T | |
| 103. |
Assertion (A): Single start threads are used for fastening purposes. Reason (R): Single start threads are easier to produce in a lathe. |
| 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» C. A is true but R is false | |
| 104. |
A through hole is drilled in an aluminium alloy plate of 15 mm thickness with a drill bit of diameter 10 mm, at a feed of 0.25 mm/rev and a spindle speed of 1200 rpm. If the specific energy required for cutting this material is 0.7 N-m/ mm3, the power required for drilling is ___ W (round off to two decimal places). |
| A. | 274.89 |
| B. | 374.89 |
| C. | 274.99 |
| D. | 274 |
| Answer» B. 374.89 | |
| 105. |
In a fabrication shop, a T-joint is to be made between two plates using a chin intermittent, double fillet weld of 6 mm leg length. The intermittent welds are 40 mm long and spaced 80 mm apart, edge to edge. The welding symbol of the joint is |
| A. | |
| B. | |
| Answer» E. | |
| 106. |
Consider the following statements: The magnitude of residual stresses in welding depends upon 1. Metal melted/deposited 2. Design of weldment 3. Support and clamping of components 4. Welding process used Which of the statements given above are correct? |
| A. | 1, 2 and 4 |
| B. | 1, 2 and 3 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» C. 1 and 3 | |
| 107. |
Which two of the following joining processes are autogenous? i. Diffusion welding ii. Electroslag welding iii. Tungsten inert gas welding iv. Friction welding |
| A. | i and iv |
| B. | ii and iii |
| C. | ii and iv |
| D. | i and iii |
| Answer» B. ii and iii | |
| 108. |
Aluminium strips of 2 mm thickness are joined together by resistance spot welding process by applying an electric current 6000 A and 0.15 second. The heat required for melting aluminium is 2.9 J/mm3. The diameter and thickness of the weld nugget are found to be 5 mm and 2.5 mm respectively. Assuming the electrical resistance to be 75 micro ohms, the percentage of total energy utilized in forming the weld nugget is |
| A. | 28 |
| B. | 35 |
| C. | 65 |
| D. | 72 |
| Answer» C. 65 | |
| 109. |
Two 8 mm thick steel plates are placed 5 mm apart and welded by a butt joint. Welding is carried out at 20 V and speed of 5 mm/s. Heat transfer efficiency is 0.80. If the heat required to melt steel is 10 J/mm3 and melting efficiency is 0.625. The weld current (in amperes) will be |
| A. | 100 |
| B. | 200 |
| C. | 300 |
| D. | 400 |
| Answer» C. 300 | |
| 110. |
During open die forging process using two flat and parallel dies, a solid steel disc of initial radius (RIN) 200 mm and initial height (HIN) 50 mm attains a height (HFN) of 30 mm and radius of RFN, Along the die-disc interfaces, (i) The coefficient of friction ( ) is: = 0.35 [1 + e RIN/RFN] (ii) In the region Rss r RFN sllding friction prevails and P = 3 K.e2 (RIN r)/HFN and = p, sllding friction prevails and Where p and are the normal and the shear stresses respectively; K is the shear yield strength of steel and r is the radial distance of any point. (i) In the region 0 r RIN, sticking condition prevails. The value of Rss (in mm), where sticking condition changes to sliding friction is |
| A. | 241.76 |
| B. | 254.55 |
| C. | 265.45 |
| D. | 278.20 |
| Answer» C. 265.45 | |
| 111. |
Shrinkage allowance on pattern is provided to compensate for shrinkage when |
| A. | the temperature of liquid metal drops from pouring to freezing temp |
| B. | the metal changes from liquid to solid state at freezing temperature |
| C. | the temperature of solid phase drops from freezing to room temperature |
| D. | the temp of metal drops from pouring to room temperature |
| Answer» E. | |
| 112. |
Which of the following is the correct data structure for solid models? |
| A. | solid part face edges vertices |
| B. | solid part edges faces vertices |
| C. | vertices edges faces solid parts |
| D. | vertices faces edges solid parts |
| Answer» D. vertices faces edges solid parts | |
| 113. |
The effective number of lattice points in the unit cell of simple cubic, body centered cubic, and face centered cubic space lattices, respectively, are |
| A. | 1, 2, 2 |
| B. | 1, 2, 4 |
| C. | 2, 3, 4 |
| D. | 2, 4, 4 |
| Answer» C. 2, 3, 4 | |
| 114. |
Details pertaining to an orthogonal metal cutting process are given below: Chip thickness ratio0.4Undeformed thickness0.6 mmRake angle+10 Cutting speed2.5 m/sMean thickness of primary shear zone25 micronsThe shear strain rate in s 1 during the process is |
| A. | 0.1781 105 |
| B. | 0.7754 105 |
| C. | 1.0104 105 |
| D. | 4.397 105 |
| Answer» D. 4.397 105 | |
| 115. |
In orthogonal turning of medium carbon steel, the specific machining energy is 2.0 J/mm3. The cutting velocity, feed and depth of cut are 120 m/min, 0.2 mm/rev and 2 mm respectively. The main cutting force in N is |
| A. | 40 |
| B. | 80 |
| C. | 400 |
| D. | 800 |
| Answer» E. | |
| 116. |
A hole is of dimension 9+0+0.015 mm. The corresponding shaft is of dimension 9+0.001+0.010 The resulting assembly has |
| A. | loose running fit |
| B. | close running fit |
| C. | transition fit |
| D. | interference fit |
| Answer» D. interference fit | |
| 117. |
Taylor's tool life equation is used to estimate the life of a batch of identical HSS twist drills by drilling through holes at constant feed in 20 mm thick mild steel plates. In test 1, a drill lasted 300 holes at 150 rpm while in test 2, another drill lasted 200 holes at 300 rpm. The maximum number of holes that can be made by another drill from the above batch at 200 rpm is (correct to two decimal places). |
| A. | 25353 |
| B. | 154.54 |
| C. | 253.53 |
| D. | None of the above |
| Answer» D. None of the above | |
| 118. |
Taylor s tool life equation is given by VTn = C, where V is in m/min and T is in min. In a turning operation, two tools X and Y are used. For tool X, n = 0.3 and C = 60 and for tool Y, n = 0.6 and C = 90. Both the tools will have the same tool life for the cutting speed (in m/min, round off one decimal place) of ______. |
| A. | 50 m/min |
| B. | 40 m/min |
| C. | 45 m/min |
| D. | 41 m/min |
| Answer» C. 45 m/min | |
| 119. |
A shaft of diameter 20 0.10+0.20 mm and a hole of diameter 20+0.20 +0.10mm when assembled would yield. |
| A. | Transition fit |
| B. | Interference fit |
| C. | Clearance fit |
| D. | None of these |
| Answer» D. None of these | |
| 120. |
In a electrochemical machining (ECM) operation, a square hole of dimensions 5 mm mm is drilled in a block of copper. The current used is 5000 A. Atomic weight of copper is 63 and valence of dissolution is 1. Faradays constant is 96500 coulomb. The material removal rate (g/s) is |
| A. | 0.326 |
| B. | 3.26 |
| C. | 3.15 10 |
| D. | 3.15 10 |
| E. | |
| Answer» C. 3.15 10 | |
| 121. |
Typical machining operations are to be performed on hard-to-machine materials by using the processes listed below. Choose the best set of Operation- Process combinations Operation P. Deburring (internal surface) Q. Die sinking R. Fine hole drilling in thin sheets S. Tool sharpening Process 1. Plasma Arc Machining 2. Abrasive Flow Machining 3. Electric Discharge Machining 4. Ultrasonic Machining 5. Laser beam Machining 6. Electrochemical Grinding |
| A. | P-1, Q-5, R-3, S-4 |
| B. | P-1, Q-4, R-1, 5-2 |
| C. | P-5, Q-1, R-2, S-6 |
| D. | P-2, Q-3, R-5, S-6 |
| Answer» E. | |
| 122. |
Match the following non-traditional machining processes with the corresponding material removal mechanisms: Machining process P. Chemical machining Q. Electro-chemical machining R. Electro-discharge machining S. Ultrasonic machining Mechanism of material removal 1. Erosion 2. Corrosive reaction 3. lon displacement 4. Fusion and vaporization |
| A. | P-2, Q-3, R-4, S-1 |
| B. | P-2, Q-4, R-3, S-1 |
| C. | P-3, Q-2, R-4, S-1 |
| D. | P-2, Q-3, R-1, S-4 |
| Answer» B. P-2, Q-4, R-3, S-1 | |
| 123. |
Electrochemical machining is performed to remove material from an iron surface of 20 mm 20 mm under the following conditions: Inter electrode gap = 0.2 mm Supply voltage (DC) = 12 V Specific resistance of electrolyte = 2 ohm- cm Atomic weight of iron = 55.85 Valency of Iron = 2 Faraday's constant = 96540 Coulombs The material removal rate (in g/s) is |
| A. | 0.3471 |
| B. | 3.471 |
| C. | 34.71 |
| D. | 347.1 |
| Answer» B. 3.471 | |
| 124. |
In a CAD package, a point P(6,3,2) is projected along a vector Vrarr; (-2,1,-1). The projection of this point on X-Y plane will be |
| A. | (4, 4, 0) |
| B. | (8, 2, 0) |
| C. | (7, 4, 0) |
| D. | (2, 5, 0) |
| Answer» E. | |
| 125. |
Outside diameter of bush is turned using a mandrel. The mandrel diameter is maintained as 0.000 0.050 30.000 0.0500.000 mm and the bore diameter is 30.000 0.0000.050 mm. The maximum value in mm of the eccentricity on the bush due to the locating mandrel |
| A. | 0.050 |
| B. | 0.100 |
| C. | 0.020 |
| D. | 0.025 |
| Answer» B. 0.100 | |
| 126. |
Match the following Feature to be inspected P. Pitch and Angle errors of screw thread Q. Flatness error of a surface R. Alignment error of a machine sideways S. Profile of a cam Instrument 1. Auto Collimator 2. Optical interferometer 3. Dividing Head and Dial Gauge4. Spirit Level 5. Sine bar 6. Tool maker's Microscope |
| A. | P-6, Q-2, R-4, S-6 |
| B. | P-5, Q-2, R-1, S-6 |
| C. | P-6, Q-4, R-1, S-3 |
| D. | P-1, Q-4, R-4, S-2 |
| Answer» D. P-1, Q-4, R-4, S-2 | |
| 127. |
Match the most suitable manufacturing processes for the following parts, PartsP. Computer chip Q. Metal forming dies and moulds R. Turbine blade S. Glass Manufacturing Processes1. Electrochemical Machining 2. Ultrasonic Machining 3. Electrodischarge Machining 4. Photochemical Machining |
| 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 | |
| 128. |
In a point to point control NC machine, the slides positioned by an integrally mounted stepper motor drive. If the specification of the motor is 1 deg/pulse, and the pitch Of the lead screw is 3.6 mm. What is the expected positioning accuracy? |
| A. | 1 micron |
| B. | 10 micron |
| C. | 50 micron |
| D. | 100 micron |
| Answer» C. 50 micron | |
| 129. |
A circular shaft having diameter 65.00 0.015+0.01 mm is manufactur ed by turning pr ocess. A 50 m t hi ck coat i ng of Ti N i s deposited on the shaft Allowed variation in TiN film thickness is 5 m. The minimum hole diameter (in mm) to just provide clearance fit is |
| A. | 65.01 |
| B. | 64.95 |
| C. | 65.12 |
| D. | 65.10 |
| Answer» D. 65.10 | |
| 130. |
A cylindrical pin of 25+0.010+0.020 mm diameter is electroplated, plating thickness is 2.0 0.005mm. Neglecting the gauge tolerance, the diameter (in mm, up to 3 decimal points accuracy) of the GO ring gauge to inspect the plated pin is ____. |
| A. | 9.030 mm. |
| B. | 2.030 mm. |
| C. | 29.030 mm. |
| D. | 11.030 mm. |
| Answer» D. 11.030 mm. | |
| 131. |
As tool and work are not in contact in EDM process |
| A. | no relative motion occurs between them |
| B. | no wear of tool occurs |
| C. | no power is consumed during metal cutting |
| D. | no force between tool and work occurs |
| Answer» E. | |
| 132. |
In an interchangeable assembly, shafts of size 25.000 0.010+0.040 mm mate with holes of size 0.020 25.000 0.020+0.030mm. The maximum interference (in microns) in the assembly is |
| A. | 40 |
| B. | 30 |
| C. | 20 |
| D. | 10 |
| Answer» D. 10 | |
| 133. |
Holes of diameter 25+0.020+0.040 mm are assembled interchangeably with the pins of diameter 25 0.008+0.005 mm. The minimum clearance in the assembly will be |
| A. | 0.048 mm |
| B. | 0.015 mm |
| C. | 0.005 mm |
| D. | 0.008 mm |
| Answer» C. 0.005 mm | |
| 134. |
A Go-NO Go plug gauge is to be designed for measuring a hole of nominal diameter 25 mm with a hole tolerance of 0.015 mm. considering 10% of work tolerance to be the gauge tolerance and no wear condition, the dimension (in mm) of the GO plug gauge as per the unilateral tolerance system is |
| A. | 24.985 |
| B. | 25.015 |
| C. | 24.985 |
| D. | 24.985 |
| Answer» E. | |
| 135. |
A ring gauge is used to measure |
| A. | outside diameter but not roundness |
| B. | roundness but not outside diameter |
| C. | both outside diameter and roundness |
| D. | only external threads |
| Answer» D. only external threads | |
| 136. |
In an orthogonal cutting test on mild Steel, the following data were obtained Cutting speed : 40 m/min Depth of cut : 0.3 mm Tool rake angle : +5 Chip thickness : 1.5 mm Cutting force : 900 N Thrust force : 450 NUsing Merchants analysis, the friction angle during the machining will be |
| A. | 26.6 |
| B. | 31.5 |
| C. | 45 |
| D. | 63.4 |
| Answer» C. 45 | |
| 137. |
The dimensions of a cylindrical side riser (height = diameter) for a 25 cm 15 cm 5 cm steel casting are to be determined. For the tabulated shape factor values given below, diameter of the riser (in cm) is_______. Shape Factor 2 4 6 8 10 12 Riser volume/ 1.0 0.70 0.55 0.50 0.40 0.35 Casting volume |
| A. | 11.60 cm |
| B. | 10.66cm |
| C. | 10.60cm |
| D. | None of the above |
| Answer» D. None of the above | |
| 138. |
Application A. Undercut in components B. Large bells C. Mass production of casting by machine moulding D. Components with irregular parting lines Type of pattern 1. Cope and drag 2. Follow board 3. Gated 4. Loose piece 5. Sweep |
| 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. | |
| 139. |
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: 1. Down sprue 2. Runner 3. Ingates The sequence of the above elements in the ratio 1: 2: 4 is |
| 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 | |
| 140. |
According to Chvorinov's rule, the solidification time of a casting is proportional to (Volume/ surface area)n, where 'n' equals to |
| A. | 0.5 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» D. 4 | |
| 141. |
In... A... operation the diameter of the desired hole will be smaller than the diameter of the... B... A. blanking/piercing B. punch/die |
| A. | A |
| B. | B |
| C. | A and B |
| D. | None of the above |
| Answer» B. B | |
| 142. |
Match the following Product P. Moulded luggage Q. Packaging containers for liquid R. Long structural shapes S. Collapsible tubes Process 1. Injection moulding 2. Hot rolling 3. Impact extrusion 4. Transfer moulding 5. Blow moulding 6. Coining |
| A. | P-1, Q-4, R-6, S-3 |
| B. | P-4, Q-5, R-2, S-3 |
| C. | P-1, Q-5, R-3, S-2 |
| D. | P-5, Q-1, R-2, S-2 |
| Answer» C. P-1, Q-5, R-3, S-2 | |
| 143. |
Consider the following statements related piercing and blanking 1. Shear on the punch reduces the maximum cutting force 2. Shear increases the capacity of the press needed 3. Shear increases the life of the punch 4. Total energy needed to make the cut remains unaltered due to provision of shear. Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 1 and 4 |
| C. | 2 and 3 |
| D. | 3 and 4 |
| Answer» C. 2 and 3 | |
| 144. |
In a DC arc welding operation, the voltage-arc length characteristic was obtained as Varc = 20 + 5l where the arc length l was varied between 5 mm and 7 mm. Here Varc 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 |
| 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 | |
| 145. |
Which one among the following welding processes uses non-consumable electrode? |
| A. | Gas metal arc welding |
| B. | Submerged arc welding |
| C. | Gas tungsten arc welding |
| D. | Flux coated arc welding |
| Answer» D. Flux coated arc welding | |
| 146. |
Assertion (A): Converging passage is used for feeding liquid metal into a mould. Reason (R): Inhalation of air promotes blow holes in casting. |
| A. | Both (A) and (R) are true and (R) is the correct reason for (A) |
| B. | Both (A) and (R) are true but (R) is NOT the correct reason for (A) |
| C. | Both (A) and (R) are false |
| D. | (A) is false but (R) is true |
| E. | None of these |
| Answer» F. | |
| 147. |
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 mm2 and the unit energy required to melt the metal is 10 J/mm3. If the welding power is 2 kW, the welding speed in mm/s is closest to |
| A. | 4 |
| B. | 14 |
| C. | 24 |
| D. | 34 |
| Answer» C. 24 | |
| 148. |
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. The linear voltage (E) - arc length (L) characteristic of the welding arc can be given as (where E is in Voit and L is in mm) |
| A. | E = 20 + 2L |
| B. | E = 20 + 8L |
| C. | E = 80 + 2L |
| D. | E = 80 + 8L |
| Answer» B. E = 20 + 8L | |
| 149. |
Match the following: List-IList-IIA. Rivets for aircraft1. Forging bodyB. Carburetor body2. Cold headingC. Crank shafts3. Aluminum base alloyD. Nails4. Pressure die casting5. Investment casting |
| A. | A-3, B-4, C 1, D 2 |
| B. | A-3, B-4, C 2, D 2 |
| C. | A-4, B-3, C 1, D 2 |
| D. | A-3, B-2, C 4, D 2 |
| Answer» B. A-3, B-4, C 2, D 2 | |
| 150. |
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 106mm3. (Use g = 10 m/s ) |
| A. | 2.67 |
| B. | 8.45 |
| C. | 26.7 |
| D. | 84.50 |
| Answer» D. 84.50 | |