MCQOPTIONS
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MCQOPTIONS
This section includes 509 Mcqs, each offering curated multiple-choice questions to sharpen your Machine Design knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The critical speed of a shaft can be increased by |
| A. | shaft diameter may be increased |
| B. | bearings may be brought closer together |
| C. | Increasing the diameter of threaded portion |
| D. | frictionless bearings be used |
| E. | reciprocating load may be applied |
| Answer» C. Increasing the diameter of threaded portion | |
| 2. |
Which type of bearing is provided at the big end of connecting rod? |
| A. | Ball bearing |
| B. | Needle bearing |
| C. | Cast iron bearing |
| D. | Roller bearing |
| E. | Ball bearing |
| Answer» F. | |
| 3. |
A rope sheave of balance weight for the cage is supported on an axle 25 cm. The maximum tension in the rope is 1500 kg. For safe design the point of application of the load should be considered at |
| A. | Anywhere along the span |
| B. | Case should be analysed for various positions of load along the span |
| C. | Data should be taken from hand books |
| D. | End points |
| E. | Middle of span |
| Answer» F. | |
| 4. |
The bearing used in railway wagons are |
| A. | Roller bearings |
| B. | Ball bearings |
| C. | Bush bearings |
| D. | Journal bearings |
| E. | Thrust bearings |
| Answer» B. Ball bearings | |
| 5. |
A block weighing 1000 kg rests on a horizontal surface. The coefficient of friction is 0.3 (both static and kinetic). What frictional force will be developed if the force applied to the block in the direction parallel to the horizontal surface is 40 kg |
| A. | 40 kg |
| B. | 33.33 kg |
| C. | 30 kg |
| D. | 10 kg |
| E. | 12 kg |
| Answer» D. 10 kg | |
| 6. |
Sintered bearing |
| A. | Increasing the diameter of threaded portion |
| B. | high rpm applications |
| C. | find application is instruments |
| D. | are self-lubricating type suitable for placs where regular maintensance is difficult |
| E. | are used for under water applications |
| Answer» E. are used for under water applications | |
| 7. |
Which type of coupling will be preferred for connecting two shafts having relative speed? |
| A. | Flange coupling |
| B. | Flexible flange coupling |
| C. | Muff coupling |
| D. | Fluid coupling |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 8. |
In rolling bearings lubricant viscosity |
| A. | is decided on the basis of load |
| B. | decides the life of bearing |
| C. | is not determined by load |
| D. | Increasing the diameter of threaded portion |
| E. | is determined by operating speed |
| Answer» D. Increasing the diameter of threaded portion | |
| 9. |
Hysteresis and eddy current losses in bearings are typical to |
| A. | high speed bearings |
| B. | bearings for induction motors |
| C. | electromagnetic bearings |
| D. | Increasing the diameter of threaded portion |
| E. | foil bearings |
| Answer» D. Increasing the diameter of threaded portion | |
| 10. |
In a tap set, the first tap used in thread cutting is |
| A. | Any one |
| B. | Taper tap |
| C. | Straight tap |
| D. | Bottom tap |
| E. | Plug tap |
| Answer» C. Straight tap | |
| 11. |
Which of the following fits can be used for selective assembly? |
| A. | Loose fit |
| B. | 10 kg |
| C. | Shrink fit |
| D. | Free fit |
| E. | Medium fit |
| Answer» D. Free fit | |
| 12. |
An induction motor meant for operation on 60 cycles per second is connected to a supply having 50 cycles per second. What will happen |
| A. | The motor will not start |
| B. | The motor will run with peculiar noise |
| C. | The motor will get burnt |
| D. | The motor will not take load |
| E. | The operating speed of the motor will be less than the rated |
| Answer» F. | |
| 13. |
The pressure angle an involute gear profile gear |
| A. | Changes with position |
| B. | Depends on speed of operation |
| C. | Depends on gear pitch and clearance |
| D. | Remains constant |
| E. | None of the above |
| Answer» E. None of the above | |
| 14. |
Which dynamometer will be most suitable for measuring the BHP of an automobile engine? |
| A. | Electrical generator type |
| B. | Electrical resistance type |
| C. | None of the above |
| D. | Hydraulic type |
| E. | None of the above |
| Answer» E. None of the above | |
| 15. |
A belt when struck vibrates at a particular frequency determined by |
| A. | shape of bell |
| B. | size of ball |
| C. | material of bell |
| D. | All of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» E. Increasing the diameter of threaded portion | |
| 16. |
The buckling load depends on |
| A. | Modulus of elasticity |
| B. | Slendemess ratio |
| C. | Cross-sectional area |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 17. |
Fatigue failure starts at some |
| A. | hole |
| B. | Increasing the diameter of threaded portion |
| C. | star |
| D. | point |
| E. | discontinuity |
| Answer» F. | |
| 18. |
A 3 mm diameter rivet must be squeezed to form a head. When yield stress in tension for this alloy is 125 Kpa, the minimum value of initiating force must be not less than |
| A. | 500 N |
| B. | 5000 N |
| C. | 1000 N |
| D. | Increasing the diameter of threaded portion |
| E. | 100 N |
| Answer» B. 5000 N | |
| 19. |
When both pinion and gear are made of the same material, then from the design point of view |
| A. | Pinion is the determining factor |
| B. | Gear is the determining factor |
| C. | Any one of the two may be taken as determining factor |
| D. | Criteria is strength of any one of the teeth |
| E. | None of the above |
| Answer» B. Gear is the determining factor | |
| 20. |
The basic shaft is |
| A. | One which has no upper deviation |
| B. | One which has no lower deviation |
| C. | One which has least deviation on both upper and lower side |
| D. | Does not exist |
| E. | None of the above |
| Answer» B. One which has no lower deviation | |
| 21. |
Which of the following is a positive drive? |
| A. | Rope drive |
| B. | Flat belt drive |
| C. | Gear drive |
| D. | V-belt drive |
| E. | None of the above |
| Answer» D. V-belt drive | |
| 22. |
A chain drive is used for |
| A. | Distance is no criteria for such drives |
| B. | Medium distance |
| C. | Long distance |
| D. | Very short distance |
| E. | Short distance |
| Answer» B. Medium distance | |
| 23. |
How many revolutions per minute one radian per second is equal to |
| A. | 3.6 |
| B. | 5.949 |
| C. | 9.549 |
| D. | 1/3.6 |
| E. | 1 |
| Answer» D. 1/3.6 | |
| 24. |
The column which has the highest equivalent length has |
| A. | Both ends fixed |
| B. | One end fixed and other end free |
| C. | Both ends hinged and pin joined |
| D. | One end fixed and other end hinged |
| E. | None of the above |
| Answer» B. One end fixed and other end free | |
| 25. |
Gantry girders are invariably designed to resist |
| A. | transverse and lateral loads |
| B. | Increasing the diameter of threaded portion |
| C. | transverse, lateral and axial load |
| D. | lateral loads only |
| E. | transverse loads only |
| Answer» D. lateral loads only | |
| 26. |
The size of the fillet weld is given by |
| A. | throat of the fillet |
| B. | Increasing the diameter of threaded portion |
| C. | smaller size of the plate welded |
| D. | smaller side of the triangle |
| E. | hypotenuse of the triangle |
| Answer» E. hypotenuse of the triangle | |
| 27. |
As far as possible adhesive joints should be loaded in |
| A. | shear |
| B. | torsion |
| C. | compression |
| D. | Any of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. torsion | |
| 28. |
Rankine formula is valid upto slenderness ratio of |
| A. | 100 |
| B. | 150 |
| C. | 60 |
| D. | 120 |
| E. | 80 |
| Answer» E. 80 | |
| 29. |
Size of rivet is specified by |
| A. | Weight |
| B. | Shape |
| C. | Volume |
| D. | Shank diameter |
| E. | Diameter of head |
| Answer» E. Diameter of head | |
| 30. |
IC engine cylinders are lubricated by |
| A. | thin film lubricated |
| B. | thick film lubrication |
| C. | either of (A) and (B) above |
| D. | none of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» B. thick film lubrication | |
| 31. |
Tack welding |
| A. | Is a process of TIG welding |
| B. | Is a type of weld |
| C. | Is used for non-ferrous materials |
| D. | Is a preparation for welding |
| E. | None of the above |
| Answer» C. Is used for non-ferrous materials | |
| 32. |
Which of the following is not a symmetrical section |
| A. | Circular |
| B. | 1 beam with equal flanges |
| C. | Equal angle iron |
| D. | All of the above |
| E. | 10 kg |
| Answer» D. All of the above | |
| 33. |
Springs are used |
| A. | To store energy |
| B. | To reduce the magnitude of the transmitted force due to impact orshock |
| C. | To alter vibratory characteristics of a member |
| D. | To apply force or control motion |
| E. | Any of the above |
| Answer» F. | |
| 34. |
Hydraulic testing of boilers is done at pressures |
| A. | Slightly above atmospheric pressure |
| B. | Below and above atmosphere |
| C. | At half the working pressure of boiler |
| D. | At 1 |
| E. | At working pressure of boiler |
| Answer» E. At working pressure of boiler | |
| 35. |
Cast iron bearings are used |
| A. | for reciprocating and oscillating motions only |
| B. | Increasing the diameter of threaded portion |
| C. | when space is the major consideration |
| D. | when cost is the major consideration |
| E. | for under water applications |
| Answer» E. for under water applications | |
| 36. |
Splined shafts are most commonly used in |
| A. | aircrafts |
| B. | machine tools |
| C. | automobiles |
| D. | none of the above |
| E. | Cast steel |
| Answer» D. none of the above | |
| 37. |
M 10 secrews have a pitch of |
| A. | 0.5 mm |
| B. | 1.25 mm |
| C. | 5.00 mm |
| D. | 10 mm |
| E. | 2.50 mm |
| Answer» C. 5.00 mm | |
| 38. |
A steel that has been deoxidized with a strong de-oxidizing agent, such as Silicon or Aluminium in order to eliminate a reaction between C and O2 during solidification, is known as |
| A. | Soft steel |
| B. | Kolled steel |
| C. | De-oxidised steel |
| D. | Oxidised steel |
| E. | Anodised steel |
| Answer» C. De-oxidised steel | |
| 39. |
In case of pressure vessels having open ends the fluid pressure induces |
| A. | shear stress |
| B. | Increasing the diameter of threaded portion |
| C. | circumferential stress |
| D. | longitudinal compressive stress |
| E. | longitudinal tensile stress |
| Answer» D. longitudinal compressive stress | |
| 40. |
The rated life of a ball bearing vaires |
| A. | Inversely as cube of load |
| B. | Directly as load |
| C. | Directly as square of load |
| D. | Directly as cube of load |
| E. | Inversely as square of load |
| Answer» B. Directly as load | |
| 41. |
A boiler shell 280 cm diameter and plate thickness 12 mm is subjected to an internal pressure of 1.2 MN/m2. The hoop stress will be |
| A. | 155.5 N/m2 |
| B. | 60 N/m2 |
| C. | 45 N/m2 |
| D. | 135 N/m2 |
| E. | 180 N/m2 |
| Answer» C. 45 N/m2 | |
| 42. |
Lowest value of joint efficiency is assumed in case of |
| A. | Single riveted butt joints |
| B. | Double riveted butt joints |
| C. | Single riveted lap joints |
| D. | Double riveted lap joints |
| E. | None of the above |
| Answer» D. Double riveted lap joints | |
| 43. |
For a circular section the ratio of the plastic moment capacity to the yield moment capacity is |
| A. | 1.44 |
| B. | 1.1 |
| C. | Increasing the diameter of threaded portion |
| D. | 1.86 |
| E. | 1.7 |
| Answer» F. | |
| 44. |
Which of the following is used as bearing lines |
| A. | Brass |
| B. | Cast iron |
| C. | Babbit metal |
| D. | Cast steel |
| E. | Aluminium |
| Answer» D. Cast steel | |
| 45. |
On a triple thread screw |
| A. | Lead = 2 x pitch |
| B. | Lead = 3 x pitch |
| C. | Lead = pitch |
| D. | Pitch = 3 x lead |
| E. | Pitch = 2 x lead |
| Answer» C. Lead = pitch | |
| 46. |
The amount of energy required upto fracture is known as |
| A. | Fatigue strength |
| B. | Chrome steel |
| C. | Toughness |
| D. | Damping effect |
| E. | Creep strength |
| Answer» D. Damping effect | |
| 47. |
A bushed pin flexible type coupling is used to join two shafts which |
| A. | Are not in exact alignment |
| B. | Are not coplanar |
| C. | Change position during operation |
| D. | Are inclined |
| E. | None of the above |
| Answer» B. Are not coplanar | |
| 48. |
The column splice is used to increase |
| A. | strength of the column |
| B. | cross-sectional area of the column |
| C. | length of the column |
| D. | all of the above |
| E. | Increasing the diameter of threaded portion |
| Answer» D. all of the above | |
| 49. |
Resilience : Strain energy : |
| A. | Increasing the diameter of threaded portion |
| B. | Velocity : Kinetic energy |
| C. | Bulk modulus : Elasticity |
| D. | Potential energy : Kinetic energy |
| E. | Moment : Momentum |
| Answer» C. Bulk modulus : Elasticity | |
| 50. |
Key normally used in wrist watch is |
| A. | Kenned key |
| B. | Sunk key |
| C. | Tangent key |
| D. | Woodruff key |
| E. | None of the above |
| Answer» F. | |