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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.
| 1. |
Match List-I (Scientist) with List-II (Research work) and select the correct answer using the codes given below the lists: List-I List-II A. Schewart 1. Less function in B. Taguchi quality B. Taguchi 2. Queuing model. C. Erlang 3. Zero defect 4. Control charts Codes: |
| A. | A\[\to \]3, B\[\to \]1, C\[\to \]2 |
| B. | A\[\to \]4, B\[\to \]3, C\[\to \]1 |
| C. | A\[\to \]3, B\[\to \]1, C\[\to \]2 |
| D. | A\[\to \]4, B\[\to \]4, C\[\to \]1 |
| Answer» C. A\[\to \]3, B\[\to \]1, C\[\to \]2 | |
| 2. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I List-II A. Heat 1. PMM-2 B. Engine 2. High grade energy C. Stirring work 3. Variable flow D. Mechanical work 4. Nernst-Simon statement 5. Dissipative 6. Inexact differential 7. PMM-1 Codes: |
| A. | A\[\to \]2, B\[\to \]5, C\[\to \]4, D\[\to \]3 |
| B. | A\[\to \]2, B\[\to \]1, C\[\to \]5, D\[\to \]7 |
| C. | A\[\to \]6, B\[\to \]5, C\[\to \]4, D\[\to \]2 |
| D. | A\[\to \]6, B\[\to \]1, C\[\to \]5, D\[\to \]2 |
| Answer» E. | |
| 3. |
The temperature stress is a function of 1. Coefficient of linear expansion 2. Temperature rise 3. Modulus of elasticity The correct answer is: |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 4. |
Which of the following bearing is suitable for fluctuating demands? |
| A. | Needle roller bearing |
| B. | Ball bearing |
| C. | Tapered bearing |
| D. | Cylindrical bearing |
| Answer» B. Ball bearing | |
| 5. |
W. The solution in a transportation model (of dimension m x n) is said to be degenerate it has? |
| A. | Exactly \[(m+n\,-1)\] allocations |
| B. | Fewer than \[(m+n\,-1)\] allocations |
| C. | more than \[(m+n\,-1)\] allocations |
| D. | \[(m\times n)\] allocations |
| Answer» C. more than \[(m+n\,-1)\] allocations | |
| 6. |
A Solution is not a basic feasible solution in a transportation problem if after allocations: |
| A. | There is not closed loop |
| B. | There is a closed loop |
| C. | Total number of allocations is one less than the sum of number of sources and destinations |
| D. | There is degeneracy. |
| Answer» B. There is a closed loop | |
| 7. |
Consider the following statements. State of stress at a point when completely specified, enables one to determine the 1. Principal stresses at the point. 2. Maximum shearing stress at the point 3. Stress components on any arbitrary plane containing the point Of these statements: |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | 1 and 2 are correct |
| Answer» B. 1 and 3 are correct | |
| 8. |
A steel hub of 100 mm internal diameter and uniform thickness of 10 mm was heated to a temperature \[300{}^\circ C\] to shrink-fit on a shaft. On cooling, a crack developed parallel to the direction of the length of the hub. Consider the following factors in this 1. Tensile hoop stress 2. Tensile radial stress 3. Compressive hoop stress 4. Compressive radial stress The cause of failure is attributable to: |
| A. | 1 alone |
| B. | 1 and 3 |
| C. | 1, 2 and 4 |
| D. | 2, 3 and 4 |
| Answer» B. 1 and 3 | |
| 9. |
An axial flow fan balanced at one speed often exhibits substantial vibrational effect when operated at other speeds, mainly due to: |
| A. | Primary critical speed effect |
| B. | Secondary critical speed effect |
| C. | Unbalanced parts of the fan |
| D. | Aerodynamic unbalance |
| Answer» C. Unbalanced parts of the fan | |
| 10. |
Phenomenon of choking in compressor means: |
| A. | No flow of air. |
| B. | Fixed mass flow rate regardless of pressure ratio. |
| C. | Reducing mass flow rate with increase in pressure ratio |
| D. | Increased inclination of the chord with air steam. |
| Answer» C. Reducing mass flow rate with increase in pressure ratio | |
| 11. |
If air resistance is neglected while it is executing small oscillations, the acceleration of the bob of a simple pendulum at the midpoint of its swing will be: |
| A. | Zero |
| B. | A minimum but not equal to zero |
| C. | A maximum |
| D. | Not determinable unless the length of the pendulum and the mass of the bob are known |
| Answer» B. A minimum but not equal to zero | |
| 12. |
Stirling and Ericsson cycles are: |
| A. | irreversible cycles |
| B. | quasi - static cycles |
| C. | semi - reversible cycles |
| D. | reversible cycles |
| Answer» E. | |
| 13. |
Which one of the following is the third basic component of robots besides power supply and control (memory) console? |
| A. | Software |
| B. | Coaxial cable |
| C. | Mechanical unit arm |
| D. | Microcomputer |
| Answer» D. Microcomputer | |
| 14. |
If a gas obeys van-der Waals' equation at the critical point, then \[\frac{R\,{{T}_{c}}}{{{p}_{c}}\,{{v}_{c}}}\] is equal to which one of the following? |
| A. | 0 |
| B. | 1 |
| C. | 1.5 |
| D. | 2.67 |
| Answer» E. | |
| 15. |
In milk chilling plants, the usual secondary refrigerant is: |
| A. | Ammonia solution |
| B. | Sodium Silicate |
| C. | Glycol |
| D. | Brine |
| Answer» D. Brine | |
| 16. |
Lewis equation in case of gears is used to find the: |
| A. | Bending stress |
| B. | Tensile stress |
| C. | compressive stress |
| D. | All of these |
| Answer» B. Tensile stress | |
| 17. |
An ideal heat pump and an ideal refrigerator, which are reversible in operation, operate between same upper and lower temperature limits. If the coefficient of performance of the refrigerator is 4.5, then what is the coefficient of performance of the heat pump |
| A. | 3.5 |
| B. | 5.5 |
| C. | 2.5 |
| D. | 6.5 |
| Answer» C. 2.5 | |
| 18. |
Consider the following characteristics: 1. Multiple operations can he performed 2. Operator's fatigue is greatly reduced 3. Ideally suited for batch production 4. A breakdown in one machine does not affect the flow of products 5. Can accommodate modifications in design of components, within certain limits. The characteristics which can he attributed to special purpose machines would include |
| A. | 1, 3 and 4 |
| B. | 1, 2 and 4 |
| C. | 2, 3 and 5 |
| D. | 1, 2 and 5 |
| Answer» D. 1, 2 and 5 | |
| 19. |
Match List-I with List-II and select the correct answer using the codes given below the lists: List-I(A function connected with NC m/c tool) List-II (Associate parameter) A. interpolation 1. Tape preparation B. Parity check 2. Canned cycle C. Preparatory function 3. Drilling D. Point-to-point 4. Controlling 5. Turning Codes: |
| A. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]3 |
| B. | A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]5 |
| C. | A\[\to \]5, B\[\to \]1, C\[\to \]3, D\[\to \]2 |
| D. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| Answer» B. A\[\to \]4, B\[\to \]1, C\[\to \]2, D\[\to \]5 | |
| 20. |
For a given lift of the follower in a given angular motion of the cam, the acceleration/ retardation the follower will be the least when the profile of the cam during the rise portion is: |
| A. | Such that the follower motion is simple harmonic |
| B. | Such that the follower motion has a constant velocity from start to end |
| C. | A straight line, it being a tangent cam |
| D. | Such that the follower velocity increases linearly for half the rise portion and then decreases linearly for the remaining half of the rise portion |
| Answer» C. A straight line, it being a tangent cam | |
| 21. |
A wooden beam of rectangular cross-section 10 cm deep by 5 cm wide carries maximum shear force of 2000 kg. Shear stress at neutral axis of the beam section is: |
| A. | Zero |
| B. | \[40\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\] |
| C. | \[60\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\] |
| D. | \[80\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\] |
| Answer» D. \[80\,\,kgf\text{/c}{{\text{m}}^{\text{2}}}\] | |
| 22. |
When two mutually perpendicular principal stresses are unequal but alike, the maximum shear stress represented by: |
| A. | The diameter of the Mohr's circle |
| B. | Half the diameter of the Mohr's circle |
| C. | One-third the diameter of the Mohr's circle |
| D. | One-fourth the diameter of the Mohr's circle |
| Answer» C. One-third the diameter of the Mohr's circle | |
| 23. |
Reciprocating compressors are provided with: |
| A. | Simple disc/plate valve |
| B. | Poppet valve |
| C. | Spring-loaded disc valve |
| D. | Solenoid valve |
| Answer» B. Poppet valve | |
| 24. |
Which one of the following is realized by hydraulic dashpot shock absorbers? |
| A. | Viscous damping |
| B. | Structural damping |
| C. | Coulomb damping |
| D. | spring damping |
| Answer» B. Structural damping | |
| 25. |
A system in dynamic balance implies that: |
| A. | The system is critically damped |
| B. | There is no critical speed in the system |
| C. | The system is also statically balanced |
| D. | There will be absolutely no wear of bearings |
| Answer» D. There will be absolutely no wear of bearings | |
| 26. |
Plane stress at a point in a body is defined by principal stresses \[3\sigma \] and \[\sigma .\] The ratio of the maximum normal stress to the maximum shear stress on the plane of maximum shear stress is: |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 27. |
In an axial flow compressor, stalling is the phenomenon of: |
| A. | Air motion at some velocity |
| B. | Air stream blocking the passage |
| C. | Reversed flow of air |
| D. | Air stream not following the blade contour |
| Answer» E. | |
| 28. |
Clapeyron's equation is used for finding out the: |
| A. | 'Dryness fraction of steam only |
| B. | Entropy of superheated vapour only |
| C. | Specific volume at any temperature and pressure. |
| D. | Total heat of superheated steam only |
| Answer» D. Total heat of superheated steam only | |
| 29. |
Diamond pin location is used in a fixture because: |
| A. | It does not wear out |
| B. | It takes care of any variation in centre distance between two holes |
| C. | It is easy to clamp the part on diamond pins |
| D. | It is easy to manufacture |
| Answer» C. It is easy to clamp the part on diamond pins | |
| 30. |
Transfer machines can be denned as: |
| A. | Material processing machines |
| B. | Material handling machines |
| C. | Material processing and material handling machines |
| D. | Component feeders for automatic assembly |
| Answer» C. Material processing and material handling machines | |
| 31. |
The assignments algorithm is applicable to which of the following combined situations for the purpose of improving productivity? 1. Identification of sales force market. 2. Scheduling of operator market 3. Fixing machine location Select the correct answer using the codes given below: |
| A. | 1, 2 and 3 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 1 and 2 |
| Answer» D. 1 and 2 | |
| 32. |
Which of the following pair, a ball and socket joint forms? |
| A. | Spherical pair |
| B. | Rolling pair |
| C. | Turning pair |
| D. | Sliding pair |
| Answer» B. Rolling pair | |
| 33. |
Feed drives in CMC milling machines are provided by: |
| A. | Synchronous motors |
| B. | Induction motors |
| C. | Stepper motors |
| D. | Servo-motors |
| Answer» E. | |
| 34. |
In a transfer line: |
| A. | All the machine tools must be automatic |
| B. | The work stations must form a closed-loop |
| C. | The cycle time if total time taken by all the machining operations |
| D. | All the machine tools must he of conventional and general purpose type. |
| Answer» D. All the machine tools must he of conventional and general purpose type. | |
| 35. |
Which of the following is not an extensive property |
| A. | entropy |
| B. | enthalpy |
| C. | internal energy |
| D. | density |
| Answer» E. | |
| 36. |
Reaction turbine discharges 3 m/s of water under a head of 10 m with an overall efficiency of 92%. The power developed is: |
| A. | 295.2 kW |
| B. | 237.0 kW |
| C. | 271.0 kW |
| D. | 265.2 kW |
| Answer» D. 265.2 kW | |
| 37. |
A heat engine using lake water at \[12{}^\circ C\] as source and the surrounding atmosphere at \[2{}^\circ C\] as sink executes 1080 cycles per minute. If amount of heat supplied per cycle is 57 J, what is the output of the engine? |
| A. | 66 W |
| B. | 56 W |
| C. | 46 W |
| D. | 36 W |
| Answer» E. | |
| 38. |
A feasible solution to the linear programming problem should: |
| A. | Satisfy the problem constraints |
| B. | Optimize the objective function |
| C. | Satisfy the problem constraints and non-negativity restrictions |
| D. | Satisfy the non-negativity restrictions |
| Answer» B. Optimize the objective function | |
| 39. |
If the arrival takes place every 10 minutes with a service time 4 minutes per unit then the mean arrival rate, mean service at and the probability that one would have to wait will be respectively: |
| A. | 10, 4 and 0.25 |
| B. | 0.1, 0.25 and 0.4 |
| C. | 10, 0.4 and 0.25 |
| D. | 0.1, 0.25 and 0.1 |
| Answer» C. 10, 0.4 and 0.25 | |
| 40. |
A two-stage compressor takes in air at 1.1 bars and, discharges at 20 bars. For maximum efficiency, the intermediate pressure is: |
| A. | 10.55 bars |
| B. | 7.33 bars |
| C. | 5.5 bars |
| D. | 4.7 bars |
| Answer» E. | |
| 41. |
The critical value of Mach number for a subsonic airfoil is associated with sharp increase in drag due to local shock formation and its interaction with the boundary layer. A typical value of tills critical Mach number is of the order of |
| A. | 0.4 to 0.5 |
| B. | 0.75 to 0.85 |
| C. | 1.1 to 1.3 |
| D. | 1.5 to 2.0 |
| Answer» D. 1.5 to 2.0 | |
| 42. |
Which of the following in an irreversible process? |
| A. | Isothermal process |
| B. | Isentrobic process |
| C. | Isoparic process |
| D. | Isenthalpic process |
| Answer» E. | |
| 43. |
Roots blower is an example of: |
| A. | Reciprocating (positive displacement) compressor |
| B. | Rotary (positive displacement) compressor |
| C. | Centrifugal compressor |
| D. | Axial compressor |
| Answer» C. Centrifugal compressor | |
| 44. |
Consider the following statements: 1. Critical or whirling speed of the shaft is the speed at which it tends to vibrate violently in the transverse direction. 2. To find the natural frequency of a shaft carrying several loads, the energy method gives approximate results. 3. Dunkerley's method gives accurate results of the natural frequency of a shaft carrying several loads. Which of these statements is/are correct? |
| A. | 1 only |
| B. | 2 and 3 |
| C. | 1 and 3 |
| D. | 1, 2 and 3 |
| Answer» B. 2 and 3 | |
| 45. |
A fixed gear having 200 teeth is in mesh with another gear having 50 teeth. The two gears are connected by an arm. The number of turns made by the smaller gear for one revolution of arm about the centre of the bigger gear is: |
| A. | \[\frac{2}{4}\] |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 46. |
In a CNC machine tool, encoder is used to sense and control: |
| A. | Table position |
| B. | table velocity |
| C. | Spindle speed |
| D. | coolant flow |
| Answer» B. table velocity | |
| 47. |
For a cantilever beam of length 'L' flexural rigidity El and loaded at its free end by a concentrated load 'M' match list-I with list-II and select the correct answer: List-I List-II A. maximum bending moment 1. WL B. Strain energy 2. \[\text{W}{{\text{L}}^{\text{2}}}\text{/2EI}\] C. Maximum slope 3. \[\text{W}{{\text{L}}^{3}}\text{/2EI}\] D. Maximum deflection 4. \[{{\text{W}}^{2}}{{\text{L}}^{2}}\text{/6EI}\] Codes: |
| A. | A\[\to \]1, B\[\to \]4, C\[\to \]3, D\[\to \]2 |
| B. | A\[\to \]1, B\[\to \]4, C\[\to \]2, D\[\to \]3 |
| C. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 |
| D. | A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]2 |
| Answer» C. A\[\to \]4, B\[\to \]2, C\[\to \]1, D\[\to \]3 | |
| 48. |
For lightly damped heavy rotor systems, resonance occurs when the forcing co is equal to: Where \[{{\omega }_{cr}}\] is the critical speed. |
| A. | \[2\,\,{{\omega }_{cr}}\] |
| B. | \[\sqrt{2}\,\,{{\omega }_{cr}}\] |
| C. | \[{{\omega }_{cr}}\] |
| D. | \[\frac{1}{2}\,\,{{\omega }_{cr}}\] |
| Answer» D. \[\frac{1}{2}\,\,{{\omega }_{cr}}\] | |
| 49. |
Consider the following operations and time required on a multi-spindle automatic machine to produce a J particular job: 1. Turning - 1.2 minutes 2. Drilling - 1.6 minutes 3. Forming - 0.2 minute 4. Parting - 0.6 minute The time required to make one piece (cycle time) will be: |
| A. | 0.6 minute |
| B. | 1.6 minutes |
| C. | 3.6 minutes |
| D. | 0.9 minute |
| Answer» D. 0.9 minute | |
| 50. |
Which of the following mechanisms are suitable for indexing the table of rotary transfer line? 1. Rack and pinion 2. Ratchet and pawl 3. Lead screw 4. Geneva mechanism Select the correct answer by using the codes given below: Codes: |
| A. | 1, 2 and 3 |
| B. | 2, 3 and 4 |
| C. | 1, 3 and 4 |
| D. | 1, 2 and 4 |
| Answer» B. 2, 3 and 4 | |