Machine Design MCQs

1. Which of the following is not a factor considered in machine design? A) Material selection B) Functionality C) Cost D) Production volume Answer: D) Production volume 2. What is the purpose of a safety factor in machine design? A) To increase production speed B) To ensure the machine lasts longer C) To account for uncertainties and variations D) To reduce material costs Answer: C) To account for uncertainties and variations 3. What type of load causes a machine component to stretch or compress? A) Torsional load B) Shear load C) Axial load D) Bending load Answer: C) Axial load 4. Which material property indicates a material’s ability to resist deformation under load? A) Hardness B) Ductility C) Elasticity D) Toughness Answer: C) Elasticity 5. What is the main function of bearings in machine design? A) To reduce friction B) To provide electrical insulation C) To increase temperature resistance D) To improve aesthetics Answer: A) To reduce friction 6. Which gear type is most commonly used for transmitting power between parallel shafts? A) Spur gears B) Helical gears C) Bevel gears D) Worm gears Answer: A) Spur gears 7. Which force causes a gear tooth to bend? A) Torsional force B) Axial force C) Bending force D) Shear force Answer: C) Bending force 8. What is the purpose of a flywheel in a machine? A) To store energy B) To reduce vibrations C) To increase speed D) To cool down the machine Answer: A) To store energy 9. Which of the following is not a type of belt drive? A) V-belt drive B) Flat belt drive C) Chain drive D) Friction drive Answer: D) Friction drive 10. Which type of welding process is commonly used in machine fabrication? A) Arc welding B) Gas welding C) Laser welding D) Ultrasonic welding Answer: A) Arc welding 11. Which type of fastener provides a permanent joint? A) Bolt B) Screw C) Rivet D) Nut Answer: C) Rivet 12. What is the main purpose of a machine guard? A) To improve aesthetics B) To reduce noise C) To protect operators from hazards D) To increase production speed Answer: C) To protect operators from hazards 13. Which type of coupling allows for slight misalignment between shafts? A) Rigid coupling B) Flexible coupling C) Flange coupling D) Gear coupling Answer: B) Flexible coupling 14. What does the term “moment of inertia” refer to in machine design? A) A measure of a material’s hardness B) A measure of a material’s resistance to deformation C) A measure of a body’s resistance to rotational motion D) A measure of a body’s ability to conduct heat Answer: C) A measure of a body’s resistance to rotational motion 15. Which type of bearing requires lubrication to reduce friction? A) Plain bearing B) Roller bearing C) Magnetic bearing D) Ball bearing Answer: A) Plain bearing 16. Which type of motion does a cam and follower mechanism produce? A) Linear motion B) Rotary motion C) Reciprocating motion D) Oscillating motion Answer: C) Reciprocating motion 17. What is the function of a clutch in a machine? A) To reduce vibrations B) To control power transmission C) To increase torque D) To cool down the machine Answer: B) To control power transmission 18. Which material property determines a material’s resistance to fracture under tension? A) Hardness B) Toughness C) Ductility D) Elasticity Answer: B) Toughness 19. Which type of gear train is used to change the direction of rotation between two shafts? A) Simple gear train B) Compound gear train C) Epicyclic gear train D) Reverted gear train Answer: D) Reverted gear train 20. What does the term “creep” refer to in machine design? A) Sudden failure of a material B) Gradual deformation under constant load C) Abrasive wear of a surface D) Impact loading on a component Answer: B) Gradual deformation under constant load 21. Which type of material is commonly used for making springs in machines? A) Aluminum B) Copper C) Steel D) Titanium Answer: C) Steel 22. Which type of lubrication system is used in high-speed machinery? A) Splash lubrication B) Mist lubrication C) Grease lubrication D) Oil bath lubrication Answer: B) Mist lubrication 23. What is the function of a governor in a machine? A) To control speed B) To reduce friction C) To increase torque D) To improve stability Answer: A) To control speed 24. Which factor does not affect the fatigue life of a machine component? A) Material properties B) Operating temperature C) Production volume D) Surface finish Answer: C) Production volume 25. What is the primary purpose of a gearbox in a machine? A) To increase efficiency B) To reduce noise C) To change speed and torque D) To improve aesthetics Answer: C) To change speed and torque 26. Which type of brake uses fluid pressure to apply force? A) Drum brake B) Disc brake C) Hydraulic brake D) Mechanical brake Answer: C) Hydraulic brake 27. What does the term “eccentricity” refer to in machine design? A) Off-center displacement B) Material strength C) Surface roughness D) Temperature variation Answer: A) Off-center displacement 28. Which type of bearing has the lowest friction coefficient? A) Plain bearing B) Roller bearing C) Magnetic bearing D) Ball bearing Answer: D) Ball bearing 29. Which type of gear train is used to increase torque between two shafts? A) Simple gear train B) Compound gear train C) Epicyclic gear train D) Reverted gear train Answer: B) Compound gear train 30. What is the purpose of a shock absorber in a machine? A) To reduce vibrations B) To control power transmission C) To increase torque D) To absorb sudden impact forces Answer: D) To absorb sudden impact forces 31. Which type of thread profile provides better load-bearing capacity? A) Square thread B) Acme thread C) V-thread D) Buttress thread Answer: D) Buttress thread 32. What does the term “creepage” refer to in electrical machine design? A) Movement of gears in a gearbox B) Gradual deformation of materials C) Distance over an insulating surface D) Wear of bearing surfaces Answer: C) Distance over an insulating surface 33. Which type of material is commonly used for bearings in high-temperature applications? A) Aluminum B) Copper C) Steel D) Ceramic Answer: D) Ceramic 34. What is the function of a silencer in a machine? A) To reduce vibrations B) To control noise C) To increase torque D) To improve aesthetics Answer: B) To control noise 35. Which type of lubrication system is suitable for heavy-duty machinery? A) Splash lubrication B) Mist lubrication C) Grease lubrication D) Oil bath lubrication Answer: D) Oil bath lubrication 36. Which type of bearing is suitable for high-speed applications? A) Plain bearing B) Roller bearing C) Magnetic bearing D) Ball bearing Answer: D) Ball bearing 37. What is the purpose of a cam in a machine? A) To control power transmission B) To convert rotary motion to linear motion C) To store energy D) To increase speed Answer: B) To convert rotary motion to linear motion 38. Which type of coupling is used to transmit torque between shafts at an angle? A) Rigid coupling B) Flexible coupling C) Flange coupling D) Gear coupling Answer: D) Gear coupling 39. What is the function of a solenoid in a machine? A) To convert electrical energy to mechanical energy B) To store energy C) To reduce friction D) To control fluid flow Answer: A) To convert electrical energy to mechanical energy 40. Which type of belt drive is most suitable for long-distance power transmission? A) V-belt drive B) Flat belt drive C) Chain drive D) Toothed belt drive Answer: C) Chain drive 41. What is the primary function of a gearbox in a motor vehicle? A) To increase torque B) To reduce noise C) To change speed and direction D) To improve fuel efficiency Answer: C) To change speed and direction 42. Which type of material is commonly used for gears in high-temperature applications? A) Aluminum B) Copper C) Steel D) Brass Answer: C) Steel 43. What does the term “torsion” refer to in machine design? A) Bending stress B) Twisting stress C) Shearing stress D) Compressive stress Answer: B) Twisting stress 44. Which type of welding process is suitable for joining dissimilar metals? A) Arc welding B) Gas welding C) Friction welding D) Laser welding Answer: C) Friction welding 45. What is the main function of a governor in an engine? A) To control speed B) To increase torque C) To reduce emissions D) To improve fuel efficiency Answer: A) To control speed 46. Which type of brake is commonly used in bicycles? A) Drum brake B) Disc brake C) Coaster brake D) Hydraulic brake Answer: C) Coaster brake 47. What is the function of a bearing in a rotating shaft? A) To reduce friction B) To increase speed C) To store energy D) To control temperature Answer: A) To reduce friction 48. Which type of gear train is used to transmit power between non-parallel shafts? A) Simple gear train B) Compound gear train C) Worm gear train D) Bevel gear train Answer: D) Bevel gear train 49. What is the primary purpose of a clutch in a vehicle transmission system? A) To control power distribution B) To reduce noise C) To engage and disengage power flow D) To improve fuel efficiency Answer: C) To engage and disengage power flow 50. Which material property is crucial for determining a material’s resistance to wear? A) Hardness B) Ductility C) Elasticity D) Toughness Answer: A) Hardness

Machine Design MCQs

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