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MCQOPTIONS
This section includes 2670 Mcqs, each offering curated multiple-choice questions to sharpen your Railways knowledge and support exam preparation. Choose a topic below to get started.
| 1501. |
Which of the following effects are possible due to residual stresses in welding? 1. Reduce dimensional stability 2. Weld cracking 3. Effect on fatigue strength 4. Reduction in the creep strength Select the correct answer using the code given below: |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2, 3 and 4 |
| Answer» C. 1 and 3 only | |
| 1502. |
Consider the following statements in respect of the laser beam welding: 1. It can be used for welding any metal or their combinations because of very high temperature of the focal points. 2. Heat affected zone is very large because of quick heating. 3. High vacuum is required to carry the process. Which of the statements given above is/are correct? |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 only |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 only | |
| 1503. |
In MIG welding, the metal is transferred into the form of which one of the following? |
| A. | A fine spray of metal |
| B. | Molten drops |
| C. | Weld pool |
| D. | Molecules |
| Answer» D. Molecules | |
| 1504. |
The coating material of an arc welding electrode contains which of the following? 1. Deoxidising agent, 2. Arc stabilizing agent. 3. Slag forming agent Select the correct answer using the code given below |
| A. | 1, 2 and 3 |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» D. 1 and 3 only | |
| 1505. |
Consider the following statements in respect of oxydiacetylene welding: 1. The joint is not heated to a state of fusion. 2. No pressure is used. 3. Oxygen is stored in steel cylinder at a pressure of 14 MPa 4. When there is an excess of acetylene used, there is decided change in the appearance of flame. Which of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 3 and 4 |
| D. | 1, 2 and 4 |
| Answer» C. 1, 3 and 4 | |
| 1506. |
Consider the following statement: The magnitude of residual stresses in welding depends upon 1. Design of welding 2. Support and clamping of components 3. Welding process used. Which of the statements given above are correct? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 1 and 3 |
| D. | 2 and 3 |
| Answer» C. 1 and 3 | |
| 1507. |
Match List-I (Welding problems) with List-II (Causes) and select the correct answer using the codes given below the list: List-I List-II A. Cracking of weld 1. Excessive metal stresses B. Cracking of base 2. High joint metal rigidity C. Porosity 3. Oxidation D. Inclusions 4. Excessive \[{{H}_{2}},{{O}_{2}},{{N}_{2}}\] in the welding atmosphere Codes: |
| A. | A\[\to \]2, B\[\to \]1, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]1, C\[\to \]4, D\[\to \]2 |
| Answer» B. A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 | |
| 1508. |
In resistance welding, heat is generated due to the resistance between: |
| A. | Electrode and work piece |
| B. | Asperities between touching plates |
| C. | Two dissimilar metals being in contact |
| D. | Interatomic forces. |
| Answer» B. Asperities between touching plates | |
| 1509. |
High speed electron beam of electron beam welding is focused on the weld spot using: |
| A. | Vacuum lens |
| B. | inert gas lens |
| C. | Optical lens |
| D. | magnetic lens |
| Answer» B. inert gas lens | |
| 1510. |
Match List-I (Welding problems) with List-II (Causes) and select the correct answer using the codes given below the list: List-I (Welding problems) List-II (Causes) A. Spatter 1. Damp electrodes B. Distortion 2. Arc blow C. Porosity 3. Improper cleaning in multipass welding D. Poor joint selection 4. Poor joint selection Codes: |
| A. | A\[\to \]4, B\[\to \]2, C\[\to \]3, D\[\to \]1 |
| B. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| C. | A\[\to \]2, B\[\to \]4, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| Answer» E. | |
| 1511. |
Which one of the following welding processes consists of minimum heat effected zone (HAZ)? |
| A. | Shielded Metal Arc Welding (SWAW) |
| B. | Laser Beam Welding (L3BW) |
| C. | Ultrasonic Welding (USW) |
| D. | Metal Inert Gas Welding MIG) |
| Answer» D. Metal Inert Gas Welding MIG) | |
| 1512. |
Consider the following statements: 1. In gas welding, the torch should be held at an angle of \[30{}^\circ \] to \[45{}^\circ \] from the horizontal plane 2. In gas welding, the size of the torch depends upon the thickness of metal to be formed 3. Drag in gas cutting is the time difference between heating of the plate and starting the oxygen gas for cutting. Which of the statements given above are correct? |
| A. | 1, 2 and 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» B. 1 and 2 | |
| 1513. |
Which of the following are the major characteristics of submerged arc welding? 1. High welding speeds 2. High deposition rates 3. Low penetration 4. Low cleanliness Select the correct answer using the code given below: |
| A. | 2 and 3 |
| B. | 1, 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 2 |
| Answer» E. | |
| 1514. |
In manual arc welding, the equipment should have drooping characteristics in order to maintain the: |
| A. | Voltage constant when arc length changes |
| B. | Current constant when arc length changes |
| C. | Temperature in the arc constant |
| D. | Weld pool red-hot |
| Answer» B. Current constant when arc length changes | |
| 1515. |
Pinch effect in welding is the result of: |
| A. | Expansion of gases in the arc |
| B. | Electromagnetic forces |
| C. | Electric force |
| D. | Surface tension of the molten metal |
| Answer» B. Electromagnetic forces | |
| 1516. |
Arc blow is more common in: |
| A. | a.c. welding |
| B. | d.c. welding with straight polarity |
| C. | d.c. welding with bare electrods |
| D. | a.c. welding with bare electrodes. |
| Answer» D. a.c. welding with bare electrodes. | |
| 1517. |
Which of the following statements is/arc correct in respect of welding of two pieces in upset welding? 1. The ends to be welded should touch each other before current is switched 2. The ends to be welded should touch each other after current is switched on. 3. The two pieces have to be pressed together after desired welding temperature is reached. Select the correct answer using the code given below: |
| A. | 1 only |
| B. | 1 and 3 |
| C. | 2 only |
| D. | 2 and 1 |
| Answer» E. | |
| 1518. |
Consider the following processes 1. Gas welding 2. Thermit welding 3. Arc welding 4. Resistance welding The correct sequence of these processes in increasing order of their welding temperatures is: |
| A. | 1, 3, 4, 2 |
| B. | 1, 2, 3, 4 |
| C. | 4, 3, 1, 2 |
| D. | 4, 1, 3, 2 |
| Answer» E. | |
| 1519. |
Which one of the following statements is correct? |
| A. | No flux is used in gas welding of mild steel |
| B. | Borax is the commonly used flux coating welding electrodes |
| C. | Laser beam welding employs a vacuum chamber and thus avoids use of a shielding method |
| D. | AC can be used for GTAW process |
| Answer» B. Borax is the commonly used flux coating welding electrodes | |
| 1520. |
Which of the following joining processes are best suited for manufacturing pipes to carry gas products? 1. Rivetting 2. Welding 3. Bolts and nuts Select the correct answer using the codes given below: Codes: |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 alone |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 1521. |
The voltage-current characteristics of a DC generator for arc welding is a straight line between an open-circuit voltage of 80 V and short-circuit current of 300 A. The generator settings for maximum arc power will be: |
| A. | 80 V and 150 A |
| B. | 40 V and 300 A |
| C. | 40 V and 150 V |
| D. | V and 300 A |
| Answer» D. V and 300 A | |
| 1522. |
Weld spatter occurs due to any of the following except: |
| A. | High welding current |
| B. | Too small an electrode |
| C. | Are |
| D. | Wrong polarity |
| Answer» E. | |
| 1523. |
A circular solid shaft is subjected to a bending moment of 400 kN.m and a twisting moment of 300 kN.m. On the basis of the maximum principal stress theory, the direct stress is \[\sigma \] and according to the maximum shear stress theory, the shear stress is t The ratio \[\sigma /t\] is: |
| A. | \[\frac{1}{5}\] |
| B. | \[\frac{3}{4}\] |
| C. | \[\frac{9}{5}\] |
| D. | \[\frac{11}{6}\] |
| Answer» D. \[\frac{11}{6}\] | |
| 1524. |
The maximum shear occurs on the outermost fibres of a circular shaft under torsion. In a close coiled helical spring, the maximum shear stress occurs on the: |
| A. | Outermost fibres |
| B. | Fibres at mean diameter |
| C. | Innermost fibres |
| D. | End coils |
| Answer» D. End coils | |
| 1525. |
A thin cylinder with both ends closed is subjected to internal pressure p. The longitudinal stress at the surface has been calculated as \[{{\sigma }_{0}}.\] Maximum shear stress at the surface will be equal to: |
| A. | \[2{{\sigma }_{0}}\] |
| B. | \[1,\,5{{\sigma }_{0}}\] |
| C. | \[{{\sigma }_{0}}\] |
| D. | \[0.5{{\sigma }_{0}}\] |
| Answer» E. | |
| 1526. |
Two beams of equal cross-sectional area arc subjected to equal bending moment. If one beam has square cross-section and the other has circular section, then |
| A. | Both beams will be equally strong |
| B. | Circular section beam will be stronger |
| C. | Square section beam will be stronger |
| D. | The strength of the beam will depend on the nature of loading |
| Answer» D. The strength of the beam will depend on the nature of loading | |
| 1527. |
A rod of material with \[E=200\times {{10}^{3}}\] MPa and \[\propto ={{10}^{-\,3}}mm/mm{}^\circ C\] is fixed at both the ends. It is uniformly heated such that the increase in temperature is \[30{}^\circ C.\] the stress, developed in the rod is: |
| A. | \[6000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\](Tensile) |
| B. | \[6000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Compressive) |
| C. | \[2000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Tensile) |
| D. | \[2000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Compressive) |
| Answer» C. \[2000\,\,\text{N/m}{{\text{m}}^{\text{2}}}\] (Tensile) | |
| 1528. |
The bending moment equation, as a function of distance x measured from the left end, for a simply supported beam of span. L m carrying a uniformly distributed load of intensity w N/m will be given by: |
| A. | \[M=\text{wL/2}\,\,(L-x)-\text{W/2}\,\,(L-x)N.m\] |
| B. | \[M=\text{wL/2}x-\text{w}{{x}^{\text{2}}}\text{/2}-N.m\] |
| C. | \[M=\text{wL/2}\,\,{{(L-x)}^{2}}-\text{w/2}\,\,(L-x)-N.m\] |
| D. | \[M=\text{w}{{x}^{\text{2}}}\text{/2}-\text{wL}x\text{/2}N.m\] |
| Answer» C. \[M=\text{wL/2}\,\,{{(L-x)}^{2}}-\text{w/2}\,\,(L-x)-N.m\] | |
| 1529. |
The number of elastic constants for a completely anisotropic elastic material which follows Hooks laws is |
| A. | 3 |
| B. | 4 |
| C. | 21 |
| D. | 25 |
| Answer» D. 25 | |
| 1530. |
Consider the following 1. Safety valve. 2. Steam trap 3. Steam separator 4. Economiser. Among these the boiler accessories would" include: |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1 and 4 |
| D. | 1, 2, 3 and 4 |
| Answer» C. 1 and 4 | |
| 1531. |
A reaction turbine stage has angles a, \[\alpha ,\]\[\beta ,\]\[\gamma \]as nozzle angle, inlet blade and outlet blade angle respectively. The expression for maximum efficiency of the turbine is given by: |
| A. | \[\frac{2{{\cos }^{2}}\beta }{1+{{\cos }^{2}}\beta }\] |
| B. | \[\frac{2{{\cos }^{2}}\gamma }{1+{{\cos }^{2}}\gamma }\] |
| C. | \[\frac{2{{\cos }^{2}}\alpha }{1+{{\cos }^{2}}\alpha }\] |
| D. | \[\frac{\cos (\alpha +\beta )}{{{\cos }^{2}}\gamma }\] |
| Answer» D. \[\frac{\cos (\alpha +\beta )}{{{\cos }^{2}}\gamma }\] | |
| 1532. |
Two closed-coil springs are made from the same small diameter wire, one wound on 2.5 cm diameter core and the other on 1.25 cm diameter core. If each spring has V coils, then the ratio of their spring constants would be: |
| A. | 1/16 |
| B. | 44409 |
| C. | 1/4 |
| D. | ½ |
| Answer» C. 1/4 | |
| 1533. |
A circular shaft is subjected to the combined action of bending, twisting and direct axial loading. The maximum bending stress \[\sigma \] maximum shearing stress \[\sqrt{3\sigma }\] and a uniform axial stress \[\sigma \](compressive) are produced. The \[\sigma \] maximum compressive normal stress produced in the shaft will be: |
| A. | 3\[\sigma \] |
| B. | 2\[\sigma \] |
| C. | \[\sigma \] |
| D. | Zero |
| Answer» C. \[\sigma \] | |
| 1534. |
A solid shaft of diameter 100 mm, length 1000 mm is subjected to a twisting moment ?T? The maximum shear stress developed in the shaft is 60 N/mm. A hold of 50 mm diameter is now drilled throughout the length of shaft. To develop a maximum shear stress of 60 N/ mm in the hollow shaft, the torque ?T? must he reduced by: |
| A. | T/4 |
| B. | T/8 |
| C. | T/12 |
| D. | T/16 |
| Answer» E. | |
| 1535. |
A simply supported beam of constant flexural rigidity and length 2 L carries a concentrated load 'P' at its mid-span and the deflection under that load is \[\delta .\] if a cantilever beam of the same flexural rigidity length is subjected to load ?P? at its free end, them the deflection at the free end will be: |
| A. | \[1/2\delta \] |
| B. | \[\delta \] |
| C. | \[2\delta \] |
| D. | \[4\delta \] |
| Answer» D. \[4\delta \] | |
| 1536. |
Two hollow shafts of the same material have the same length and outside diameter. Shaft 1 has internal diameter equal to one-third of the outer diameter and shaft 2 has internal diameter equal to half of the outer diameter. If both the shafts are subject to the same torque, the ratio of their twists \[{{\theta }_{1}}/{{\theta }_{2}}\] will be equal to: |
| A. | 16/81 |
| B. | 8/27 |
| C. | 19/27 |
| D. | 243/256 |
| Answer» E. | |
| 1537. |
For a free vortex design of blade in the rotor of a reaction axial turbine, the specific work along the blade height is: |
| A. | Higher at the blade hub and lower at the blade tip |
| B. | Constant from huh to tip |
| C. | Lower at the hub and tip but different from the mean section |
| D. | Same at the hub and tip but different from the mean section. |
| Answer» B. Constant from huh to tip | |
| 1538. |
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and the rotor blade exit angle is 30". For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the stator will be: |
| A. | \[640/\sqrt{3}\,\text{m/s}\] |
| B. | 640 m/s |
| C. | \[320/\sqrt{3}\,\text{m/s}\] |
| D. | \[160/\sqrt{3}\,\text{m/s}\] |
| Answer» D. \[160/\sqrt{3}\,\text{m/s}\] | |
| 1539. |
Given that a = nozzle angle, n = number of rows of moving blades in a velocity compounded. Impulse turbine, the optimum blade speed ratio is: |
| A. | \[2\cos {{\alpha }_{1}}n\] |
| B. | \[\frac{n\cos {{\alpha }_{1}}}{2}\] |
| C. | \[\frac{\cos {{\alpha }_{1}}}{2(n+1)}\] |
| D. | \[\frac{\cos {{\alpha }_{1}}}{2n}\] |
| Answer» E. | |
| 1540. |
The critical pressure ratios for flow of dry saturated and superheated steam through a nozzle are respectively: |
| A. | 0.5279 and 0.550 |
| B. | 0577 and 0.550 |
| C. | 0.577 and 0.546 |
| D. | 0.5279 and 0.546 |
| Answer» D. 0.5279 and 0.546 | |
| 1541. |
The deformation of a bar under its own weight as compared to that when subjected to a direct axial load equal to its own weight will be: |
| A. | The same |
| B. | One-fourth |
| C. | Half |
| D. | Double |
| Answer» D. Double | |
| 1542. |
The length of the chest-expander spring when it is unstretched, is 0.6 m and its stiffness is 10 N/mm The work done in stretching it to 1 m will be: |
| A. | 800 J |
| B. | 1600 J |
| C. | 3200 J |
| D. | 6400 J |
| Answer» B. 1600 J | |
| 1543. |
A tapering bar (diameters of end sections being \[{{d}_{1}}\] and\[{{d}_{2}}\]) and a bar of uniform cross-section ?d? have the same length and are subjected to the same axial pull. Both the bars will have the same extension if ?d' is equal to: |
| A. | \[\frac{{{d}_{2}}+{{d}_{2}}}{2}\] |
| B. | \[\sqrt{{{d}_{1}}{{d}_{2}}}\] |
| C. | \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\] |
| D. | \[\sqrt{\frac{{{d}_{1}}+{{d}_{2}}}{2}}\] |
| Answer» C. \[\sqrt{\frac{{{d}_{1}}{{d}_{2}}}{2}}\] | |
| 1544. |
What is the work done if a bucket of water weighing 10 N is pulled up from a well 20 m deep by a rope weighing 1 N/m? |
| A. | 200 N-m |
| B. | 400 N-m |
| C. | 500 N-m |
| D. | 600 N-m |
| Answer» C. 500 N-m | |
| 1545. |
A body moves down a smooth inclined plane and if same body is dropped vertically down from the same height as that of the inclined plane top, then following parameters on reaching the ground will be same: |
| A. | Velocity |
| B. | Momentum |
| C. | Kinetic energy |
| D. | All of the above |
| Answer» E. | |
| 1546. |
When a mass is rotating in a plane about a fixed point, its angular momentum is directed along: |
| A. | The radius |
| B. | The tangent to the orbit |
| C. | A line perpendicular to the plane of rotation |
| D. | None of the above. |
| Answer» E. | |
| 1547. |
A particle of mass m has momentum p. Its kinetic energy is: |
| A. | \[\text{mp}\] |
| B. | \[{{p}^{2}}m\] |
| C. | \[{{\text{p}}^{\text{2}}}\text{/m}\] |
| D. | \[{{\text{p}}^{\text{2}}}\text{/(2m)}\] |
| Answer» C. \[{{\text{p}}^{\text{2}}}\text{/m}\] | |
| 1548. |
When two bodies stick together after collision, the collision is said to be: |
| A. | Perfectly elastic |
| B. | partially elastic |
| C. | Completely inelastic |
| D. | plastic |
| Answer» D. plastic | |
| 1549. |
Which one of the following principles cannot be used to solve problems involving friction? |
| A. | D' Alembert's principle |
| B. | Equations of Motion |
| C. | Principle of work and energy |
| D. | Conservation of energy |
| Answer» C. Principle of work and energy | |
| 1550. |
Which of the following cannot be increased by using an appropriate machine? |
| A. | Force |
| B. | torque |
| C. | Velocity |
| D. | work |
| Answer» E. | |