MCQOPTIONS
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MCQOPTIONS
This section includes 1003 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The bearings of medium series have capacity __________ over the light series. |
| A. | 10 to 20% |
| B. | 20 to 30% |
| C. | 30 to 40% |
| D. | 40 to 50% |
| Answer» D. 40 to 50% | |
| 2. |
The antifriction bearings |
| A. | have low starting and low running friction at moderate speeds |
| B. | have high initial cost |
| C. | can carry both radial and thrust loads |
| D. | all of these |
| Answer» E. | |
| 3. |
In a partial journal bearing, the angle of contact of the bearing with the journal is |
| A. | 120° |
| B. | 180° |
| C. | 270° |
| D. | 360° |
| Answer» B. 180° | |
| 4. |
A shaft coupling should |
| A. | be easy to connect or disconnect |
| B. | transmit full power of the shaft |
| C. | hold the shafts in perfect alignment |
| D. | all of these |
| Answer» E. | |
| 5. |
Which of the following property is desirable in parts subjected to shock and impact loads? |
| A. | Strength |
| B. | Stiffness |
| C. | Brittleness |
| D. | Toughness |
| Answer» E. | |
| 6. |
In block brakes, the ratio of shoe width to wheel diameter is taken between |
| A. | 0.1 and 0.25 |
| B. | 0.25 and 0.50 |
| C. | 0.50 and 0.75 |
| D. | 0.75 and 1 |
| Answer» C. 0.50 and 0.75 | |
| 7. |
Oldham coupling is used to transmit power between two parallel shafts which are slightly offset. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
A shaft is subjected to fluctuating loads for which the normal torque () and bending moment () are 1000 N-m and 500 N-m respectively. If the combined shock and fatigue factor for bending is 1.5 and combined shock and fatigue factor for torsion is 2, then the equivalent twisting moment for the shaft is |
| A. | 2000 N-m |
| B. | 2050 N-m |
| C. | 2100 N-m |
| D. | 2136 N-m |
| Answer» E. | |
| 9. |
The major diameter of a screw thread is also known as core or root diameter. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 10. |
The initial tension (in newtons) in a bolt used for making a fluid tight joint like steam engine cover joints, is calculated by the relation (where = Nominal diameter of bolt in mm) |
| A. | 1420 |
| B. | 1680 |
| C. | 2080 |
| D. | 2840 |
| Answer» E. | |
| 11. |
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called |
| A. | plasticity |
| B. | elasticity |
| C. | ductility |
| D. | malleability |
| Answer» D. malleability | |
| 12. |
When a machine member is subjected to torsion, the torsional shear stress set up in the member is |
| A. | zero at both the centroidal axis and outer surface of the member |
| B. | maximum at both the centroidal axis and outer surface of the member |
| C. | zero at the centroidal axis and maximum at the outer surface of the member |
| D. | maximum at the centroidal axis and zero at the outer surface of the member |
| Answer» D. maximum at the centroidal axis and zero at the outer surface of the member | |
| 13. |
A pressure vessel is said to be a thin shell, if the ratio of wall thickness to its diameter is equal to 1/10. |
| A. | Yes |
| B. | No |
| Answer» C. | |
| 14. |
In order to withstand resistance to wear, the best profile of gear is |
| A. | full depth involute tooth |
| B. | 20° full depth involute tooth |
| C. | 20° involute stub tooth |
| D. | stub tooth |
| Answer» B. 20° full depth involute tooth | |
| 15. |
A key is normally made from a cold rolled mild steel bars. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 16. |
Which of following statement is correct, for the two shafts connected in parallel? |
| A. | Torque in each shaft is the same |
| B. | Shear stress in each shaft is the same |
| C. | Angle of twist of each shaft is the same |
| D. | Torsional stiffness of each shaft is the same |
| Answer» D. Torsional stiffness of each shaft is the same | |
| 17. |
Lewis form factor for the 20° full depth involute system is equal to 0.154 - 0.841/. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 18. |
The railway carriage couplings have |
| A. | square threads |
| B. | acme threads |
| C. | knuckle threads |
| D. | buttress threads |
| Answer» D. buttress threads | |
| 19. |
The taper on cotter and slot is made on both the sides. |
| A. | Agree |
| B. | Disagree |
| Answer» C. | |
| 20. |
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where = Diameter of the shaft) |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 21. |
The acme threads are usually found on |
| A. | spindles of bench vices |
| B. | railway carriage couplings |
| C. | feed mechanism of machine tools |
| D. | screw cutting lathes |
| Answer» E. | |
| 22. |
The springs mostly used in machinery have spring index less than 3. |
| A. | Correct |
| B. | Incorrect |
| Answer» C. | |
| 23. |
Factor of safety for fatigue loading is the ratio of |
| A. | elastic limit to the working stress |
| B. | elastic limit to the yield point |
| C. | endurance limit to the working stress |
| D. | Young's modulus to the ultimate tensile strength |
| Answer» D. Young's modulus to the ultimate tensile strength | |
| 24. |
The shafts of larger diameter are usually forged and turned to size in a lathe. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 25. |
The draw of cotter should not be more than |
| A. | 3 mm |
| B. | 6 mm |
| C. | 8 mm |
| D. | 12 mm |
| Answer» B. 6 mm | |
| 26. |
The bolts of smaller diameter than M16 are not permitted in making fluid tight joints. |
| A. | Correct |
| B. | Incorrect |
| Answer» B. Incorrect | |
| 27. |
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than |
| A. | 1.5 |
| B. | 2 |
| C. | 2.5 |
| Answer» D. | |
| 28. |
The spigot and socket joint is mostly used for pipes which are burried in the earth. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 29. |
The permissible stress in the fillet weld is 100 N/mm. The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is |
| A. | 7.5 kN |
| B. | 10.6 kN |
| C. | 15 kN |
| D. | 22.5 kN |
| Answer» C. 15 kN | |
| 30. |
Two shafts and under pure torsion are of identical length and identical weight and are made of the same material. The shaft is solid and the shaft is hollow. We can say that |
| A. | shaft |
| B. | is better than shaft |
| C. | shaft |
| D. | is better than shaft |
| E. | both the shafts are equally good |
| Answer» B. is better than shaft | |
| 31. |
According to Unwin's formula, the relation between the diameter of rivet hole () and the thickness of plate () is given by (where and are in mm) |
| A. | = |
| B. | = 1.6 |
| C. | = 2 |
| D. | = 6 |
| Answer» E. | |
| 32. |
In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where = Diameter of rivet hole) |
| A. | 1.5 |
| B. | 2 |
| C. | 2.5 |
| Answer» C. 2.5 | |
| 33. |
A flanged pipe joint will be a leak-proof joint, if the circumferential pitch of the bolts is (where = Diameter of bolt hole) |
| A. | less than 20 |
| B. | greater than 30 |
| C. | between 20 |
| D. | and 30 |
| E. | equal to inside diameter of pipe |
| Answer» D. and 30 | |
| 34. |
A locking device extensively used in marine type connecting rod ends is a |
| A. | jam nut |
| B. | castle nut |
| C. | sawn nut |
| D. | ring nut |
| Answer» E. | |
| 35. |
The V-belts are particularly suitable for __________ drives. |
| A. | short |
| B. | long |
| Answer» B. long | |
| 36. |
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle |
| A. | increases |
| B. | decreases |
| C. | remains unchanged |
| Answer» B. decreases | |
| 37. |
In cylindrical cams, the follower moves |
| A. | in a direction perpendicular to the cam axis |
| B. | in a direction parallel to the cam axis |
| C. | in any direction irrespective of cam axis |
| D. | along the cam axis |
| Answer» C. in any direction irrespective of cam axis | |
| 38. |
The included angle for the acme thread is 29°. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 39. |
The velocity factor for very accurately cut and ground metallic gears operating at velocities upto __________ is equal to 6/6 + . |
| A. | 10 m/s |
| B. | 12.5 m/s |
| C. | 15 m/s |
| D. | 20 m/s |
| Answer» E. | |
| 40. |
Guest's theory is used for |
| A. | brittle materials |
| B. | ductile materials |
| C. | elastic materials |
| D. | plastic materials |
| Answer» C. elastic materials | |
| 41. |
The square threads are usually found on |
| A. | spindles of bench vices |
| B. | railway carriage couplings |
| C. | feed mechanism of machine tools |
| D. | screw cutting lathes |
| Answer» D. screw cutting lathes | |
| 42. |
According to Clavarino's equation, the thickness of a cylinder is equal to (where = Inner diameter of cylinder, = Internal pressure, and μ = Poisson's ratio. ) |
| A. | none of these |
| Answer» B. | |
| 43. |
For general industrial machinery, the ratio of the length of journal to its diameter is taken as |
| A. | 0.5 to 1 |
| B. | 1 to2 |
| C. | 3 to 5 |
| D. | 5 to 10 |
| Answer» C. 3 to 5 | |
| 44. |
The spring mostly used in gramophones is |
| A. | helical spring |
| B. | conical spring |
| C. | flat spiral spring |
| D. | volute spring |
| Answer» D. volute spring | |
| 45. |
The power transmitted by means of a belt depends upon |
| A. | velocity of the belt |
| B. | tension under which the belt is placed on the pulleys |
| C. | arc of contact between the belt and the smaller pulley |
| D. | all of the above |
| Answer» E. | |
| 46. |
Which of the following coupling is used to connect two shafts which have both lateral and angular misalignment ? |
| A. | Bushed pin type coupling |
| B. | Universal coupling |
| C. | Oldham coupling |
| D. | all of these |
| Answer» E. | |
| 47. |
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to |
| A. | reduce vibration |
| B. | reduce slip |
| C. | ensure uniform loading |
| D. | ensure proper alignment |
| Answer» D. ensure proper alignment | |
| 48. |
A steel containing 0.8% carbon is known as |
| A. | eutectoid steel |
| B. | hyper-eutectoid steel |
| C. | hypo-eutectqid steel |
| D. | none of these |
| Answer» B. hyper-eutectoid steel | |
| 49. |
A screw is said to be over hauling screw, if the |
| A. | friction angle is less than helix angle |
| B. | friction angle is more than helix angle |
| C. | friction angle is equal to helix angle |
| D. | efficiency of screw is 100% |
| Answer» B. friction angle is more than helix angle | |
| 50. |
Oldham coupling is used to connect two shafts |
| A. | which are perfectly aligned |
| B. | which are not in exact alignment |
| C. | which have lateral misalignment |
| D. | whose axes intersect at a small angle |
| Answer» D. whose axes intersect at a small angle | |