MCQOPTIONS
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MCQOPTIONS
This section includes 55 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following statements is true for structure/speed diagrams? |
| A. | Structure diagrams gives range ratio of spindle speeds |
| B. | Speed diagrams do not give range ratio of spindle speeds |
| C. | Speed diagrams consider motor speed |
| D. | All of the above |
| Answer» D. All of the above | |
| 2. |
Which of the following statements is/are false if separate cylinder liner is pressed inside the cylinder of large engines? |
| A. | Easy replacement of liner in case of wear and tear |
| B. | Cheap grade material cannot be used for jacket |
| C. | Liner is to be made of heat resistant cast iron |
| D. | None of the above |
| Answer» C. Liner is to be made of heat resistant cast iron | |
| 3. |
Which of the following statements is/are true about safety/risk? |
| A. | Risk is potential for damage |
| B. | Hazard is likely hood of damage |
| C. | Danger is combination of risk and hazard |
| D. | All of the above |
| Answer» D. All of the above | |
| 4. |
Which stress is induced in cylinder wall due to side thrust of the piston? |
| A. | Axial stress |
| B. | Circumferential stress |
| C. | Longitudinal stress |
| D. | Bending stress |
| Answer» E. | |
| 5. |
Which type of cylinder liners are used in engines having bore diameter more than 125 mm? |
| A. | Dry liners |
| B. | Wet liners |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 6. |
Which type of welded joints are not included in class 3 pressure vessels? |
| A. | Double welded butt joint with full penetration |
| B. | Single welded but joint with back strip |
| C. | Single full fillet lap joints |
| D. | None of the above |
| Answer» D. None of the above | |
| 7. |
Why is autofrettage process used in pressure vessels? |
| A. | Increase fatigue lifetime |
| B. | To enhance carrying capacity |
| C. | To introduce compressive residual stress in them |
| D. | All of the above |
| Answer» E. | |
| 8. |
Which of the following statements is false for troughed belt conveyors? 1. Troughed belt conveyors use flexible belts 2. They contain five idlers 3. Depth of trough decreases with increasing number of idlers 4. Flexibility of belt increases as depth of trough decreases |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | None of the above |
| Answer» D. None of the above | |
| 9. |
Which of the following processes is used for surface finishing? |
| A. | Shaping |
| B. | Broaching |
| C. | Lapping |
| D. | All of the above |
| Answer» D. All of the above | |
| 10. |
Which of the following principle recognizes human capabilities and limitations using design effective handling equipment? |
| A. | Safety principle |
| B. | Obsolescence principle |
| C. | Ecology principle |
| D. | Ergonomic principle |
| Answer» E. | |
| 11. |
Which of the following parts of piston act as bearing for connecting rod side thrust? |
| A. | Reinforcing ribs |
| B. | Piston barrel |
| C. | Piston gudgeon |
| D. | Piston skirt |
| Answer» E. | |
| 12. |
Which of the following parameters are to be considered for parts with non rotational symmetry in machining process? |
| A. | Avoid long parts |
| B. | Avoid tin parts |
| C. | Machined surfaces should be parallel to each other and with the base |
| D. | All of the above |
| Answer» E. | |
| 13. |
Which of the following methods is most efficient method of design of experiments (DOE)? |
| A. | Factorial design |
| B. | Fractional factorial design |
| C. | Taguchi method |
| D. | All of the above |
| Answer» D. All of the above | |
| 14. |
Which of the following materials are used for cylinder liners? |
| A. | Alloy cast iron |
| B. | Grey cast iron |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 15. |
Which of the following is not expressed by primary design equation? |
| A. | Functional parameters |
| B. | Material parameters |
| C. | Geometrical parameters |
| D. | None of the above |
| Answer» E. | |
| 16. |
Which of the following is not an unfired pressure vessel? |
| A. | Heat exchanger |
| B. | Storage vessels |
| C. | Steam boilers |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
Which of the following is not a hoisting equipment with lifting gear? |
| A. | Cage elevators |
| B. | Jib cranes |
| C. | Pulleys |
| D. | Troughed belts |
| Answer» E. | |
| 18. |
Which of the following is a property of bulk load? |
| A. | Hardness |
| B. | Cake forming tendency |
| C. | Suspension part |
| D. | Weight |
| Answer» C. Suspension part | |
| 19. |
Which of the following ergonomic factors are encountered in engineering applications? |
| A. | Thermal radiations |
| B. | Lubrication failure |
| C. | Fatigue |
| D. | Corrosion |
| Answer» D. Corrosion | |
| 20. |
Which of the following curves have the mean value equal to zero in the graph of frequency vs random variable? |
| A. | Normal distribution curve |
| B. | Standard normal distribution curve |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» C. Both a. and b. | |
| 21. |
Which of the following belt conveyors have low volume carrying capacity? |
| A. | Flat belts |
| B. | Troughed belts |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Troughed belts | |
| 22. |
Which equation is used to determine wall thickness for brittle materials? |
| A. | Brinie's equation |
| B. | Claviro's equation |
| C. | Lame's equation |
| D. | All of the above |
| Answer» D. All of the above | |
| 23. |
Which equation is used to calculate thickness of an alloy steel cylinder with open ends? |
| A. | Clavarino's equation |
| B. | Birnie's equation |
| C. | Lame's equation |
| D. | None of the above |
| Answer» C. Lame's equation | |
| 24. |
Which discharge method provides only intermediate discharge for low speed flat belt conveyor? |
| A. | Plow discharge |
| B. | Tripper discharge |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» B. Tripper discharge | |
| 25. |
Which criteria of failure is used to indicate St Venent's theory? |
| A. | Maximum principle stress theory |
| B. | Maximum principle strain theory |
| C. | Shear stress theory |
| D. | None of the above |
| Answer» C. Shear stress theory | |
| 26. |
Which belt conveyor prevents sliding down of material at an inclination of 55° with horizontal? |
| A. | Flat belt conveyor |
| B. | Troughed belt conveyor |
| C. | Blanket belt conveyor |
| D. | Woven wire belt conveyors |
| Answer» D. Woven wire belt conveyors | |
| 27. |
What will be the number of tests required in an experiment to obtain maximum information based on factorial design if, number of levels and number of factors are 2 and 5 respectively? |
| A. | 32 |
| B. | 25 |
| C. | 10 |
| D. | None of the above |
| Answer» B. 25 | |
| 28. |
What is the weld joint efficiency if pressure vessel is fabricated with single full fillet lap joint? |
| A. | 1.0 |
| B. | 0.55 |
| C. | 0.65 |
| D. | 0.85 |
| Answer» C. 0.65 | |
| 29. |
What is the relation between standard deviation(σ) and arithmetic mean (μ) to determine coefficient of variation (C)? |
| A. | C = σ + μ |
| B. | C = σ – μ |
| C. | C = σ / μ |
| D. | C = σ x μ |
| Answer» D. C = σ x μ | |
| 30. |
What is the purpose of using a gear box? |
| A. | To increase torque |
| B. | To increase speed |
| C. | Converts single input speed into multiple output speeds |
| D. | All of the above |
| Answer» E. | |
| 31. |
What is the maximum percentage loss of economic cutting speed if geometric progression ratio = 1.06 ? |
| A. | 17.0 % |
| B. | 11.5 % |
| C. | 5.7 % |
| D. | 2.9 % |
| Answer» E. | |
| 32. |
What is the geometric progression ratio if maximum and minimum spindle speeds are 500 r.p.m and 300 r.p.m respectively? (Number of speed steps = 7) |
| A. | 0.91 |
| B. | 1.5 |
| C. | 1.08 |
| D. | 2.0 |
| Answer» D. 2.0 | |
| 33. |
What is the function of gudgeon pin? |
| A. | Acts as stiffeners |
| B. | Supports piston head |
| C. | Connects piston to connecting rod |
| D. | All of the above |
| Answer» D. All of the above | |
| 34. |
What is meant by mean time to failure (MTTF)? |
| A. | Mean time between two successive failure components |
| B. | Maximum time between two successive failure components |
| C. | Sum of survival time for number of components divided by number of failures |
| D. | Sum of number of failures divided by survival time for number of components |
| Answer» D. Sum of number of failures divided by survival time for number of components | |
| 35. |
What is harmonic progression? |
| A. | Difference between reciprocal of two successive spindle speeds is constant |
| B. | Difference between two successive spindle speeds is constant |
| C. | Ratio of two successive spindle speeds is constant. |
| D. | Ratio of two successive spindle speeds is variable. |
| Answer» B. Difference between two successive spindle speeds is constant | |
| 36. |
What does DFMA stand for? |
| A. | Design for Manual Assembly |
| B. | Design for Manufacture and Assembly |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 37. |
What does Ψ mean in Lagrange's equation (LE = U + λΨ)? |
| A. | Lagrange's multipliers |
| B. | Functional constraints |
| C. | Multiple variable objective |
| D. | None of the above |
| Answer» C. Multiple variable objective | |
| 38. |
What causes infant mortality in mechanical equipments? |
| A. | Design errors |
| B. | Manufacturing defects |
| C. | Installation defects |
| D. | All of the above |
| Answer» E. | |
| 39. |
What are the factors affecting selection of casting process? |
| A. | Tolerances |
| B. | Surface finish |
| C. | Both a. and b. |
| D. | None of the above |
| Answer» D. None of the above | |
| 40. |
What are bulk loads? |
| A. | Lump of material |
| B. | Single rigid mass |
| C. | Homogeneous particles |
| D. | Heterogeneous particles |
| Answer» C. Homogeneous particles | |
| 41. |
Thermal stress in cylinder liners can be reduced by _______ |
| A. | increasing the wall thickness of cylinder liner |
| B. | increasing velocity of flowing water through jacket |
| C. | both a. and b. |
| D. | none of the above |
| Answer» C. both a. and b. | |
| 42. |
Ratio of two spindle speeds is constant in _________ progression. |
| A. | Arithmetic |
| B. | Geometric |
| C. | Harmonic |
| D. | None of the above |
| Answer» C. Harmonic | |
| 43. |
Maximum and minimum diameter of a shaft to be machined is 100 mm and 80 mm respectively. What is the maximum spindle speed if cutting velocity is 40 m/min? |
| A. | 120 r.p.m |
| B. | 127 r.p.m |
| C. | 160 r.p.m. |
| D. | 636 r.p.m. |
| Answer» D. 636 r.p.m. | |
| 44. |
In which of the following designs, system provides its minimum critical function even after failure of the component? |
| A. | Fail passive design |
| B. | Fail active design |
| C. | Fail operational design |
| D. | None of the above |
| Answer» D. None of the above | |
| 45. |
In unfired pressure vessels, category A consists of _________ |
| A. | joints connecting flanges and flat heads |
| B. | welded joints connecting nozzles with main shell |
| C. | circumferential welded joints joints |
| D. | longitudinal welded joints |
| Answer» E. | |
| 46. |
In forging process, forging plane is the plane __________ |
| A. | parallel to die motion |
| B. | perpendicular to die motion |
| C. | where two die halves meet |
| D. | none of the above |
| Answer» C. where two die halves meet | |
| 47. |
If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves? |
| A. | 111 |
| B. | 100 |
| C. | 10 |
| D. | 11 |
| Answer» E. | |
| 48. |
Economic cutting speed is minimum if geometric ratio is _________ |
| A. | minimum |
| B. | maximum |
| C. | equal to economic cutting speed |
| D. | none of the above |
| Answer» B. maximum | |
| 49. |
Due to which effect, compressive residual stress of strain-hardening model is smaller than elastic-perfectly plastic model? |
| A. | Seeback effect |
| B. | Peltier effect |
| C. | Bauschinger effect |
| D. | None of the above |
| Answer» D. None of the above | |
| 50. |
Diameter range is high in geometric progression due to _________ spindle speed. |
| A. | low |
| B. | high |
| C. | constant |
| D. | none of the above |
| Answer» B. high | |