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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.
| 2651. |
The buckling load will he maximum for a column, if: |
| A. | One end of the column is clamped and the other end is free |
| B. | Both ends of the column are clamped |
| C. | Both ends of the column are hinged |
| D. | One end of the column is hinged and the other end is free |
| Answer» C. Both ends of the column are hinged | |
| 2652. |
A metal pipe of 1 m diameter contains a fluid having a pressure of \[10\,\,\text{kgf/c}{{\text{m}}^{\text{2}}}\text{.}\] If the permissible tensile stress in the metal is \[200\,\,\text{kgf/c}{{\text{m}}^{\text{2}}}\] then the thickness of the metal required for making the pipe would be: |
| A. | 5 mm |
| B. | 10 mm |
| C. | 20 mm |
| D. | 25 mm |
| Answer» E. | |
| 2653. |
A length of 10 mm diameter steel wire is coiled to a close coiled helical spring having 8 coils of 75 mm mean diameter, and the spring has a stiffness k. If the same length of wire is coiled to 10 coils of 60 mm mean diameter, then the spring stiffness will be: |
| A. | k |
| B. | 1.25 k |
| C. | 1.56 k |
| D. | 1.95 k |
| Answer» D. 1.95 k | |
| 2654. |
A simply supported beam of rectangular section 4 cm by 6 cm carries a mid-span concentrated load such that the 6 cm side lies parallel to line of action of loading; deflection under the load is\[\delta \]. If the beam is now supported with the 4cm side parallel to line of action of loading, the deflection under the load will be: |
| A. | 0.44 \[\delta \] |
| B. | 0.67 \[\delta \] |
| C. | 1.5 \[\delta \] |
| D. | 2.25 \[\delta \] |
| Answer» E. | |
| 2655. |
The number of independent elastic constants required to express the stress strain relationship for a linearly elastic isotropic materials is |
| A. | One |
| B. | Two |
| C. | Three |
| D. | Four |
| Answer» C. Three | |
| 2656. |
Match List-I with List-II and select correct answer using the codes given below the lists: List-II (Condition of beam) List-II (Bending moment diagram) A. Subjected to bending moment at the end of a cantilever. 1. Triangle B. Cantilever carrying uniformly distributed load over the whole length 2. Cubic parabola C. Cantilever carrying linearly varying load from zero at the fixed end to maximum at the support. 3. Parabola D. A beam having load at the centre and supported at the ends 4. Rectangle Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]2, D\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]1, D\[\to \]2 |
| Answer» C. A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 | |
| 2657. |
Two coiled springs, each having stiffness K, are placed in parallel. The stiffness of the combination will be: |
| A. | \[4K\] |
| B. | \[2K\] |
| C. | \[\frac{K}{2}\] |
| D. | \[\frac{K}{4}\] |
| Answer» C. \[\frac{K}{2}\] | |
| 2658. |
Principal stresses at a point in plane stressed element are \[{{\sigma }_{x}}={{\sigma }_{y}}=500k\text{g/c}{{\text{m}}^{\text{2}}}.\] Normal stress on the plane inclined at \[45{}^\circ \] to x-axis will be: |
| A. | 0 |
| B. | \[500\,k\text{g/c}{{\text{m}}^{\text{2}}}\] |
| C. | \[707\,k\text{g/c}{{\text{m}}^{\text{2}}}\] |
| D. | \[1000\,k\text{g/c}{{\text{m}}^{\text{2}}}\] |
| Answer» C. \[707\,k\text{g/c}{{\text{m}}^{\text{2}}}\] | |
| 2659. |
When \[\sigma \] and Young's Modulus of Elasticity constant, the energy-absorbing capacity subject to dynamic forces, is a function of its. |
| A. | Length |
| B. | cross-section |
| C. | Volume |
| D. | none of the above |
| Answer» D. none of the above | |
| 2660. |
A circular solid shaft is subjected to a bending 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 o- 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. \[\frac{11}{6}\] | |
| 2661. |
The maximum shear occurs on the outermost of a circular shaft under torsion. In a close helical spring, the maximum shear stress occurs the |
| A. | Outermost fibres |
| B. | Fibres at mean diameter |
| C. | Innermost fibres |
| D. | End coils |
| Answer» D. End coils | |
| 2662. |
A thin cylinder with both ends closed is subjected internal pressure p. The longitudinal stress at 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. | |
| 2663. |
If a thick cylindrical shell is subjected to internal pressure, then hoop stress, radial stress and longitudinal stress at a point in the thickness will be |
| A. | Tensile, compressive and tensile respectively |
| B. | All compressive |
| C. | All tensile |
| D. | Tensile, compressive and compressive respectively. |
| Answer» E. | |
| 2664. |
A bar of length L and of uniform cross-section are A and second moment of area l is subjected to a pull P. If Young's modulus of elasticity of the bar material is E, the expression for strain energy stored in the bar will be |
| A. | \[\frac{{{P}^{2}}L}{2AE}\] |
| B. | \[\frac{P{{L}^{2}}}{2EI}\] |
| C. | \[\frac{P{{L}^{2}}}{AE}\] |
| D. | \[\frac{{{P}^{2}}L}{AE}\] |
| Answer» B. \[\frac{P{{L}^{2}}}{2EI}\] | |
| 2665. |
A short column of external diameter D and internal diameter d carries an eccentric load d. The greatest eccentricity which the load can have without producing tension on the cross- section of the column would be |
| A. | \[\frac{d+D}{8}\] |
| B. | \[\frac{{{d}^{2}}+{{D}^{2}}}{8d}\] |
| C. | \[\frac{{{d}^{2}}+{{D}^{2}}}{8d}\] |
| D. | \[\sqrt{\frac{{{d}^{2}}+{{D}^{2}}}{8}}\] |
| Answer» C. \[\frac{{{d}^{2}}+{{D}^{2}}}{8d}\] | |
| 2666. |
Maximum shear stress in a solid shaft of diameter D and length L twisted through an angle \[\theta \] is \[\tau \] A hollow shaft of same material and length having outside and inside diameters of D and D/2 respectively is also twisted through the same angle of twist \[\theta .\] The value of maximum shear stress in the hollow shaft will be. |
| A. | \[\frac{16}{15}\tau \] |
| B. | \[\frac{8}{7}\tau \] |
| C. | \[\frac{4}{3}\tau \] |
| D. | \[\tau \] |
| Answer» C. \[\frac{4}{3}\tau \] | |
| 2667. |
The ratio of the compressive critical load for a long column fixed at both the ends and a column with one end fixed and the other end free is: |
| A. | 0.0840277777777778 |
| B. | 0.167361111111111 |
| C. | 0.334027777777778 |
| D. | 0.667361111111111 |
| Answer» E. | |
| 2668. |
A cantilever beam of rectangular cross-section is subjected to a load W at its free end. If the depth of the beam is doubled and the load is halved, the deflection of the free end as compared to original deflection will be |
| A. | Half |
| B. | One-eighth |
| C. | One-sixteenth |
| D. | Double |
| Answer» D. Double | |
| 2669. |
In the case of a flywheel of mass moment of intertia 'I' rotating at an angular velocity \[\omega \] the expression \[\frac{1}{2}\,I{{\omega }^{2}}\] represents the: |
| A. | Centrifugal force |
| B. | angular momentum |
| C. | Torque |
| D. | Kinetic energy |
| Answer» E. | |
| 2670. |
Match List-I (Governing Equations of Heat Transfer) with List-II (Specific Case of Heat Transfer) and select the correct answer using the code given below the lists: List-I (Governing Equations of Heat Transfer) List-II (Specific Cass of Heat Transfer) A. \[\frac{{{d}^{2}}T}{d{{r}^{2}}}\,+\,\frac{2dT}{rdr}\,=\,0\] 1. Pin fin 1-D case B. \[\frac{{{\partial }^{2}}T}{\partial {{x}^{2}}}\,+\,\frac{1}{\alpha }\,\frac{\partial T}{dt}\] 2. 1-D conduction in cylinder C. \[\frac{{{d}^{2}}T}{d{{r}^{2}}}\,+\,\frac{1}{r}\,\frac{dT}{dr}\,=\,0\] 3. 1-D conduction in sphere D. \[\frac{{{d}^{2}}\theta }{d{{x}^{2}}}-{{m}^{2}}\theta =0\] 4. Plane slab Codes: |
| A. | A\[\to \]2, B\[\to \]4, C\[\to \]3, D\[\to \]1 |
| B. | A\[\to \]3, B\[\to \]1, C\[\to \]2, D\[\to \]4 |
| C. | A\[\to \]2, B\[\to \]1, C\[\to \]3, D\[\to \]4 |
| D. | A\[\to \]3, B\[\to \]4, C\[\to \]2, D\[\to \]1 |
| Answer» E. | |