About Machine Design

Machine design is a critical component of many industries, including the automotive, aerospace, and medical device industries. Machine designers use their knowledge of mechanics, materials science, and manufacturing processes to create products that meet the needs of their customers

In the automotive industry, machine designers work on projects such as the development of new engines or the design of new vehicles. In the aerospace industry, machine designers may work on projects such as the development of new aircraft or the design of new spacecraft. In the medical device industry, machine designers may work on projects such as the development of new prosthetic devices or the design of new medical devices

Machine designers must have a strong understanding of physics and mathematics in order to be successful in their field. They must also be able to communicate effectively with other members of the engineering team, as well as with customers and suppliers. Machine designers must be able to work independently and within a team environment. Machine design is a challenging field, but it is also an exciting one. Those who are interested in pursuing a career in machine design should consider taking the Machine Design MCQ

The Machine Design MCQ is a multiple-choice test that is used to assess a machine designer's knowledge of physics and mathematics

Following are some of the multiple choice questions on the Machine Design with answers that will help the students in developing their knowledge.

Machine Design MCQ

1. In the levers of first type, the mechanical advantage is ________ one.

  • Less than
  • Equal to
  • More than
  • None of these

2. The power transmitted by means of a belt depends upon

  • Velocity of the belt
  • Tension under which the belt is placed on the pulleys
  • Arc of contact between the belt and the smaller pulley
  • All of the above

3. The buckling load will be maximum for a column, if

  • One end of the column is clamped and the other end is free
  • Both ends of the column are clamped
  • Both ends of the column are hinged
  • One end of the column is hinged and the other end is free

4. Which of the following screw thread is used for power transmission in one direction only?

  • Square threads
  • Multiple threads
  • Acme threads
  • Buttress threads

5. Gears are casted by

  • Sand mould casting
  • Slush casting
  • Permanent mould casting
  • Centrifugal casting

6. The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called

  • Working depth
  • Clearance
  • Backlash
  • Face width

7. The size of a cam depends upon

  • Base circle
  • Pitch circle
  • Prime circle
  • Pitch curve

8. Rivets are generally specified by

  • Thickness of plates to be riveted
  • Length of rivet
  • Diameter of head
  • Nominal diameter

9. In a flange coupling, the bolts are subjected to

  • Tensile stress
  • Compressive stress
  • Shear stress
  • None of these

10. The V-belts are particularly suitable for __________ drives.

  • Short
  • Long
  • Both A and B
  • None of these

11. Which one of the following is a positive drive?

  • V-belt drive
  • Rope drive
  • Crossed flat belt drive
  • Chain drive

12. The rolling contact bearings as compared to sliding contact bearings have

  • Low starting and low running friction except at very high speeds
  • Accuracy of shaft alignment
  • Small overall dimensions
  • All of the above

13. A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

  • √2P/s.l
  • P/2.s.l
  • P/√2.s.l
  • 2P/s.l

14. The centrifugal tension in belts

  • Decreases the power transmitted
  • Increases the power transmitted
  • Increase the wrap angle
  • Increases the belt tension without increasing power transmission

15. In case of pressure vessels having closed ends, the fluid pressure induces

  • Longitudinal stress
  • Shear stress
  • Circumferential stress
  • None of these

16. The yield point in static loading is __________ as compared to fatigue loading.

  • Higher
  • Lower
  • Same
  • None of these

17. For high speed engines, the cam follower should move with

  • Uniform velocity
  • Simple harmonic motion
  • Uniform acceleration and retardation
  • Cycloidal motion

18. Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

  • Twice
  • Four times
  • Eight times
  • Sixteen times

19. For maximum power, the velocity of the belt will be

  • √(T/m)
  • √(T/2m)
  • √(T/3m)
  • None of these

20. A saddle key __________ power through frictional resistance only.

  • Transmits
  • Does not transmit
  • Either A or B
  • None of these

21. When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

  • Knuckle threads
  • Square threads
  • Acme threads
  • Buttress threads

22. The stress induced in the belt is,

  • Tensile stress
  • Compressive stress
  • Direct shear stress
  • Torsional shear stress

23. In levers, leverage is the ratio of

  • Load lifted to the effort applied
  • Mechanical advantage to the velocity ratio
  • Load arm to the effort arm
  • Effort arm to the load arm

24. When a close coiled helical spring is compressed, its wire is subjected to

  • Tension
  • Shear
  • Compression
  • All of the above

25. If a load W is applied instantaneously on a bar; Then the stress induced in bar will

  • Be independent of ratio of mass of load W to mass of bar (y)
  • Increase with increase in y
  • Decrease with decrease in y
  • Depend on other considerations

26. Plastic flow in ductile materials

  • Increases the seriousness of static loading stress concentration
  • Lessens the seriousness of static loading stress concentration
  • Has no effect on it
  • Depends on other considerations

27. I.S. specifies following total number of grades of tolerances

  • 18
  • 16
  • 20
  • 22

28. When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

  • 0.5 d
  • 0.75 d
  • d
  • 1.25 d

29. The function of cutting oil when threading a pipe is to

  • Provide cooling action
  • Lubricate the dies
  • Help removes chips
  • All of the above

30. The dedendum is the radial distance from the

  • Pitch circle to the top of a tooth
  • Pitch circle to the bottom of a tooth
  • Top of a tooth to the bottom of a tooth
  • Addendum circle to the clearance circle

31. If threads on a bolt are left hand, threads on nut will be

  • Right hand with same pitch
  • Left hand with same pitch
  • Could be left or right hand
  • Right hand with fine pitch

32. The following type of nut is used with alien bolt

  • Hexagonal nut
  • Slotted nut
  • Castle nut
  • Any one of the above

33. According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

  • Equating tearing resistance of the plate to the shearing resistance of the rivets
  • Equating tearing resistance of the plate to the crushing resistance of the rivets
  • Equating shearing resistance to the crushing resistance of the rivets
  • None of the above

34. According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

  • Equating tearing resistance of the plate to the shearing resistance of the rivets
  • Equating tearing resistance of the plate to the crushing resistance of the rivets
  • Equating shearing resistance to the crushing resistance of the rivets
  • None of the above

35. In second type of levers,

  • Load is in between the fulcrum and effort
  • Effort is in between the fulcrum and load
  • Fulcrum is in between the load and effort
  • None of these

36. A circular shaft can transmit a torque of 5 kN-m. If the torque is reduced to 4 kN-m, then the maximum value of bending moment that can be applied to the shaft is

  • 1 kN-m
  • 2 kN-m
  • 3 kN-m
  • 4 kN-m

37. Shaft coupling is used in machinery to

  • Introduce mechanical flexibility
  • Introduce protection against over loads
  • Reduce the transmission of shock loads
  • All of these

38. A connecting rod subjected to an axial load may buckle with

  • X-axis as neutral axis
  • Y-axis as neutral axis
  • X-axis or Y-axis as neutral axis
  • Z-axis

39. Wire ropes as compared to cotton ropes

  • Are lighter in weight
  • Offer silent operation
  • Can withstand shock loads
  • All of these

40. In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

  • Combined effect of transverse shear stress and bending stress in the wire
  • Combined effect of bending stress and curvature of the wire
  • Combined effect of transverse shear stress and curvature of wire
  • Combined effect of torsional shear stress and transverse shear stress in the wire

41. Stress concentration factor is defined as the ratio of

  • Maximum stress to the endurance limit
  • Nominal stress to the endurance limit
  • Maximum stress to the nominal stress
  • Nominal stress to the maximum stress

42. If d is the normal diameter of a bolt in mm, then the initial tension in kg in a bolt used for making a fluid tight joint as for steam engine cover joint is calculated by the relation

  • 124 d
  • 138 d
  • 151 d
  • 168 d

43. Which is correct statement? Stress concentration in cyclic loading is

  • Very serious in brittle materials and less serious in ductile materials
  • Very serious in ductile materials and less serious in brittle materials
  • Equally serious in both types of materials
  • Seriousness would depend on other factors

44. Which of the following statement is correct, for two shafts connected in parallel?

  • Torque in each shaft is the same
  • Shear stress in each shaft is the same
  • Angle of twist of each shaft is the same
  • Torsional stiffness of each shaft is the same

45. The value of stress concentration factor depends upon

  • Material and geometry of the part
  • Geometry of the part
  • Material of the part
  • None of these

46. Cold working

  • Increases the fatigue strength
  • Decreases the fatigue strength
  • Has no influence on fatigue strength
  • Alone has no influence on fatigue strength

47. At low temperatures (say 75°C) the notched bar impact value of steel

  • Increases markedly
  • Decreases markedly
  • Remain same
  • Depends on heat treatment carried out

48. While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

  • Both the ends fixed
  • Both the ends hinged
  • One end fixed and the other end hinged
  • One end fixed and the other end free

49. The shock resistance of steel is increased by adding

  • Nickel
  • Chromium
  • Nickel and chromium
  • Cobalt and molybdenum

50. A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

  • τ/2
  • τ
  • 2 τ
  • 4 τ

Enjoyed the Quiz. Share this with friends

Comments

Add Your Review

Your email address will not be published.

Subscribe to Newsletter!

Subscribe to get latest updates and information.