CEED - Machine Design 1000+ MCQ [Solved] PDF Download

1. Endurance limit or fatigue limit is the maximum stress that a member can withstand for an infinite number of load applications without failure when subjected to
A. Dynamic loading
B. Static loading
C. Combined static and dynamic loading
D. Completely reversed loading
Answer : D

2. In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as
A. Helix angle
B. Pressure angle
C. Pitch lead angle
D. None of these
Answer : A

3. In designing thick cylinders, the equation used is
A. Lame's equation
B. Birnie's equation
C. Clavarinos' equation
D. All of these
Answer : D

4. In order to remove internal stresses produced by hardening the steel, the process usually adopted is
A. Tempering
B. Normalising
C. Annealing
D. Spheroidising
Answer : A

5. For unequal width of butt straps, the thicknesses of butt straps are
A. 0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
B. 0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
C. 0.75 t for both the straps on the inside and outside
D. 0.625 t for both the straps on the inside and outside
Answer : B

6. For a square key made of mild steel, the shear and crushing strength are related as
A. Shear strength is equal to crushing strength
B. Shear strength is greater than crushing strength
C. Shear strength is less than crushing strength
D. None of the above
Answer : A

7. Screws used for power transmission should have
A. Low efficiency
B. High efficiency
C. Very fine threads
D. Strong teeth
Answer : B

8. A connecting rod is designed as a
A. Long column
B. Short column
C. Strut
D. All of these
Answer : C

9. According to Indian standard specifications, a grey cast iron designated by 'FG 200' means that the
A. Carbon content is 2%
B. Maximum compressive strength is 200 N/mm²
C. Minimum tensile strength is 200 N/mm²
D. Maximum shear strength is 200 N/mm²
Answer : C

10. If a material fails below its yield point, failure would be due to
A. Straining
B. Fatigue
C. Creep
D. Sudden loading
Answer : B

11. In worm, gears, pitch lead angle is
A. Half the angle between two inclined faces in axial plane
B. The angle between the tangent to the pitch helix and the plane of rotation
C. The angle between the tangent to the pitch helix and an element of the cylinder
D. None of the above
Answer : B

12. In thrust bearings, the load acts
A. Along the axis of rotation
B. Parallel to the axis of rotation
C. Perpendicular to the axis of rotation
D. In any direction
Answer : A

13. The plasticity is the property of a material which enables it to
A. Regain its original shape after deformation when the external forces are removed
B. Draw into wires by the application of a tensile force
C. Resist fracture due to high impact loads
D. Retain deformation produced under load permanently
Answer : D

14. At low temperatures (say 75°C) the notched bar impact value of steel
A. Increases markedly
B. Decreases markedly
C. Remain same
D. Depends on heat treatment carried out
Answer : B

15. Which is positive drive?
A. Flat belt drive
B. V-belt drive
C. Crossed belt drive
D. Timing belt
Answer : D

16. The permissible stress for carbon steel under static loading is generally taken as
A. 2000-3000 kg/m²
B. 3000-4000 kg/cm²
C. 4000-4500 kg/cm²
D. 7500-10,000 kg/cm²
Answer : C

17. The modulus of elasticity for mild steel is approximately equal to
A. 80 kN/mm²
B. 100 kN/mm²
C. 110 kN/mm²
D. 210 kN/mm²
Answer : D

18. The draw of cotter need not exceed
A. 3 mm
B. 5 mm
C. 10 mm
D. 20 mm
Answer : A

19. The designation M 33 × 2 of a bolt means
A. Metric threads of 33 numbers in 2 cm
B. Metric threads with cross-section of 33 mm
C. Metric threads of 33 mm outside diameter and 2 mm pitch
D. Bolt of 33 mm nominal diameter having 2 threads per cm
Answer : C

20. Which of the following statement is correct?
A. The distance from a point on one thread to the corresponding point on the next thread is called pitch
B. The distance which a screw thread advances axially in one rotation of the nut is called lead
C. In single start threads, lead is equal to pitch
D. All of the above
Answer : D

21. The included angle for the British Association thread is
A. 29°
B. 55°
C. 47.3°
D. 60°
Answer : B

22. A steel containing __________ 0.8% carbon is known as hypoeutectoid steel.
A. Equal to
B. Less than
C. Greater than
D. None of these
Answer : B

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 : C

24. 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
A. Equating tearing resistance of the plate to the shearing resistance of the rivets
B. Equating tearing resistance of the plate to the crushing resistance of the rivets
C. Equating shearing resistance to the crushing resistance of the rivets
D. None of the above
Answer : C

25. I.S. specifies following total number of grades of tolerances
A. 18
B. 16
C. 20
D. 22
Answer : A

26. For same pulley diameters, center distance, belt speed and belt and pulley materials,
A. Open belt drive transmits more power than crossed belt drive
B. Crossed belt drive transmits more power than open belt drive
C. Open and crossed belt drives transmit same power
D. Power transmission does not depend upon open and crossed types of constructions
Answer : B

27. In unilateral system of tolerance, the tolerance is allowed on
A. Both sides of the actual size
B. One side of the actual size
C. One side of the nominal size
D. Both sides of the nominal size
Answer : C

28. A bench vice has following type of threads
A. Metric
B. Square
C. Buttress
D. Acme
Answer : D

29. Which of the following statement is correct?
A. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials
B. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials
C. The toughness of a material increases when it is heated
D. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres
Answer : B

30. The objective of crowning of the flat pulleys of belt drive is to
A. Prevent the belt from running off the pulley
B. Increase the power transmission capacity
C. Increase the belt velocity
D. Prevent the belt joint from damaging the belt surface
Answer : A

31. A double strap butt joint (with equal straps) is
A. Always in single shear
B. Always in double shear
C. Either in single shear or double shear
D. Any one of these
Answer : B

32. Plastic flow in ductile materials
A. Increases the seriousness of static loading stress concentration
B. Lessens the seriousness of static loading stress concentration
C. Has no effect on it
D. Depends on other considerations
Answer : B

33. A chain drive transmits __________ power as compared to belt drive.
A. More
B. Less
C. Same
D. None of these
Answer : A

34. In hydrodynamic bearings
A. The oil film pressure is generated only by the rotation of the journal
B. The oil film is maintained by supplying oil under pressure
C. Do not require external supply of lubricant
D. Grease is used for lubrication
Answer : A

35. A screw is said to be a self locking screw, if its efficiency is
A. Less than 50 %
B. More than 50 %
C. Equal to 50 %
D. None of these
Answer : A

36. The included angle for the V-belt is usually
A. 10°-20°
B. 30°-40°
C. 40°-60°
D. 60°-80°
Answer : B

37. The shock resistance of steel is increased by adding
A. Nickel
B. Chromium
C. Nickel and chromium
D. Cobalt and molybdenum
Answer : C

38. In leaf springs, the longest leaf is known as
A. Master leaf
B. Lower leaf
C. Upper leaf
D. None of these
Answer : A

39. A universal coupling is used to connect two shafts
A. Which are not in exact alignment
B. Which are perfectly aligned
C. Whose axes intersect at a small angle
D. Have lateral misalignment
Answer : C

40. In helical gears, the distance parallel to the axis, between similar faces of adjacent teeth, is called
A. Normal pitch
B. Axial pitch
C. Diametral pitch
D. Module
Answer : B

41. According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by
A. 0.5 mm upto rivet diameter of 24 mm
B. 1 mm for rivet diameter from 27 mm to 36 mm
C. 2 mm for rivet diameter from 39 mm to 48 mm
D. All of the above
Answer : C

42. Wahl's stress factor __________ very rapidly as the spring index decreases.
A. Increases
B. Decreases
C. Remain same
D. None of these
Answer : A

43. In a transverse fillet welded joint, the size of weld is __________ the throat of weld.
A. 0.5 times
B. Equal to
C. 2 times
D. Double
Answer : C

44. Basic hole is one
A. Whose upper deviation is zero
B. Whose lower deviation is zero
C. Whose lower as well as upper deviations are zero
D. Does not exist
Answer : B

45. Multiple threads are used to secure
A. Low efficiency
B. High efficiency
C. High load lifting capacity
D. High mechanical advantage
Answer : B

46. The fatigue stress concentration factor is defined as
A. The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
B. The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
C. The product of the endurance limits with and without stress concentration
D. All of the above
Answer : B

47. For maximum power, the velocity of the belt will be
A. ?(T/m)
B. ?(T/2m)
C. ?(T/3m)
D. None of these
Answer : C

48. A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,
A. Hollow saddle key
B. Hollow key
C. Soft key
D. None of these
Answer : A

49. The number of slots in a 25 mm castle nut is
A. 8
B. 4
C. 2
D. 6
Answer : D

50. Oil in journal bearing should be applied at the point where load is
A. Nil or lightest
B. Maximum
C. Average
D. Any one of the above
Answer : A