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2. Which among the following types of bevel gear connects two shafts whose axes intersect at right angles?
Answer
Correct Answer:
Mitre gear
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3. Calculate the heat generated in a bearing, given that the coefficient of the friction of the bearing is 5. The load on the bearing is 10 newtons and the rubbing velocity is 5 meters per second.
Answer
Correct Answer:
250 newton meters per second
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4. In a single start threaded worm gear, the lead is _________ the axial pitch.
Answer
Correct Answer:
two times
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5. Calculate the centrifugal tension in a belt, given that the mass of the belt per unit length is 2 pounds and the linear velocity of the belt is 10 meters per second.
Answer
Correct Answer:
200 newtons
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6. Which type of rivet among the following is extensively used for structural work and machine riveting?
Answer
Correct Answer:
snap head rivet
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7. If the velocity factor of a gear is 20 and the allowable static stress is 100 newtons per square millimeter, calculate the permissible working stress of the gear.
Answer
Correct Answer:
2000 newtons per square millimeter
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8. Calculate the circular pitch of a gear whose pitch circle diameter is 100 millimeters and which has 50 teeth.
Answer
Correct Answer:
6.28 millimeters
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9. The distance between the center of adjacent rivets on adjacent gauge lines is known as ________.
Answer
Correct Answer:
diagonal pitch
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10. Calculate the polar moment of inertia of the shaft having a diameter of 20 millimeters.
Answer
Correct Answer:
15700 (millimeter)4
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11. Calculate the strength factor of a gear, given that the maximum bending stress is 40 newtons per square millimeter and the Lewis form factor is 10?
Answer
Correct Answer:
400
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12. Which type of belt is used for shafts which rotate in opposite direction?
Answer
Correct Answer:
twist belt drive
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13. The pitch of the rivet should never be less than ________. Here d is the diameter of the rivet
Answer
Correct Answer:
2d
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14. The module of a gear is 10 millimeters and the number of teeth is 25. Calculate the pitch circle diameter of the gear
Answer
Correct Answer:
250 millimeters
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15. The power transmitted is maximum in a belt drive, when the maximum tension in the belt is _______ the centrifugal tension.
Answer
Correct Answer:
three times
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16. Calculate the radius of curvature of a beam on which a bending stress of 1000 newtons per square meter is applied. The distance from extreme fiber to the neutral axis of the beam is 50 meters and the value of the Youngs modulus for the material of the beam is 2 x 105 newtons per square meter.
Answer
Correct Answer:
2000 meters
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17. Calculate the tensile strength of a double transverse fillet weld, given that the size of the weld is 5 millimeters and the length of the weld is 10 millimeters. The shear stress on the weld is 100 newtons per square millimeter.
Answer
Correct Answer:
7070 newtons
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18. Calculate the bearing characteristic number, given that the absolute viscosity of the lubricant is 10 pounds per meter second. The speed of the journal is 20 rpm and the bearing pressure is 10 newtons per square millimeter?
Answer
Correct Answer:
20
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19. Calculate the diameter of the rivet hole if the thickness of the plate to be riveted is 9 millimeters.
Answer
Correct Answer:
18 millimeters
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20. In the above diagram, "s" is the length of the weld and "t" is the thread thickness. If "s" is 5 millimeters and "t" is 10 millimeters, calculate the area at the throat.
Answer
Correct Answer:
50 millimeters
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21. The value of the lateral strain in a steel rod is 100 meters and the value of the linear strain in the same rod is 300 meters. Calculate the Poissons ratio.
Answer
Correct Answer:
1/3
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22. The length of a weld under static loading is 70 millimeters and under fatigue loading is 150 millimeters. Calculate the effective length of the weld.
Answer
Correct Answer:
220 millimeters
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23. Which type of coupling is used when two shafts intersect at a small angle?
Answer
Correct Answer:
Hooke's joint coupling
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24. The value of the notch sensitivity factor of the material of the shaft is given below. Which value is the most desirable for the construction of the shaft?
Answer
Correct Answer:
5
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25. In a long bearing, the ratio of the length of the journal to the diameter of the journal is ________
Answer
Correct Answer:
greater than 1
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26. What is the value of margin of a riveted joint which is kept to prevent the tearing of the riveted plates at the edges? Here d is the diameter of the rivet hole
Answer
Correct Answer:
1.5d
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27. If the strength of the key and the shaft is equal, then the length of the key will be _________.
Answer
Correct Answer:
1.2 times the diameter of the shaft
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28. Which among the following is the correct expression for equivalent twisting moment? Here, M is the bending moment and T is the twisting moment
Answer
Correct Answer:
√M2 + T2
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29. ____________ are used to connect two non-parallel or intersecting shafts which are coplanar in nature.
Answer
Correct Answer:
Bevel gears
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30. Calculate the solid length of a spring, given that the number of coils in the spring is 10 and the diameter of the spring wire is 2 millimeters.
Answer
Correct Answer:
20 millimeters
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31. __________ is fixed at one end and free at the other end.
Answer
Correct Answer:
Cantilever beam
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32. Which bearing among the following is a hydrodynamic lubricated bearing?
Answer
Correct Answer:
thick film bearing
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33. Calculate the bending stress induced in the shank of the bolt, given that the length of the bolt is 10 millimeters, Youngs modulus of material of bolt is 2 x 105 newtons per square millimeter and the difference in height between the extreme corners of the nut is 3 millimeters.
Answer
Correct Answer:
3 x104 newtons per square millimeter
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34. The mean diameter of the coil of a spring is 10 millimeters and the diameter of the spring wire is 5 millimeters. Calculate the spring index.
Answer
Correct Answer:
2
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35. Calculate the shear modulus in a material which undergoes a shear strain of 10 meters. The shear stress applied on the material is 20 newtons per square meter.
Answer
Correct Answer:
2 newtons per meter
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36. The modulus of elasticity of material A is 100 newtons per square meter and of material B is 200 newtons per square meter. Calculate the modular ratio between the two materials
Answer
Correct Answer:
0.5
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37. __________ is the value of ratio of the maximum shear stress with load acting parallel to the weld to the maximum shear stress when load acts perpendicular to the weld.
Answer
Correct Answer:
0.875
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38. Which type of belt among the following will give maximum efficiency, when used?
Answer
Correct Answer:
belt having a coefficient of friction of 4
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39. Calculate the attitude of a hydrodynamic journal bearing, given that the eccentricity of the bearing is 10 and the radial clearance is 5.
Answer
Correct Answer:
2
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40. Calculate the power transmitted by a shaft, given that the twisting moment in the shaft is 20 newton meters and the speed of rotation of the shaft is 60 rpm.
Answer
Correct Answer:
126.6 watts
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41. In a full journal bearing, the angle of contact of the bearing with the journal is ________.
Answer
Correct Answer:
360°
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42. The included angle in a British Standard Whitworth thread is __________.
Answer
Correct Answer:
55°
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43. Calculate the maximum shear stress developed in a rectangular cross sectional beam having an average shear stress of 50 newtons per square meter.
Answer
Correct Answer:
75 newtons per square meter
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44. _________ is used only for the transmission of bending moment
Answer
Correct Answer:
Axle
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45. The value of the included angle for a V-belt is _________.
Answer
Correct Answer:
30° to 40°
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46. Which among the following is used for obtaining constant velocity ratios?
Answer
Correct Answer:
chains
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47. A feather key permits _____________.
Answer
Correct Answer:
axial moment
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48. In a screw thread, the nominal diameter represents the _________.
Answer
Correct Answer:
major diameter
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49. In a helical gear, the helix angle for a single helical gear ranges from _______.
Answer
Correct Answer:
20° to 35°
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50. The efficiency of a riveted joint is __________.
Answer
Correct Answer:
strength of a riveted joint / strength of unriveted plates
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51. Calculate the twisting moment acting on the shaft which undergoes a torsional shear stress of 21 newtons per square millimeter. The diameter of the shaft is 300 millimeters and the polar moment of inertia of the shaft is 100 (millimeter)4.
Answer
Correct Answer:
7 newton millimeters
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52. If the diameter of the rivet hole is 10 millimeters, calculate the shearing area at the cross section of the rivet.
Answer
Correct Answer:
78.5 millimeters
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53. Calculate the flexural rigidity of a beam, given that the bending moment of the beam is 20, Youngs modulus is 2 x 105 newtons per square meter and the moment of inertia is 20 (millimeter)4.
Answer
Correct Answer:
40 x 105 newtons per square meter
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54. If the rivet hole diameter is 19.5 millimeters, calculate the nominal diameter of the rivet.
Answer
Correct Answer:
18 millimeters
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55. The diameter of a shaft is 100 millimeters. Calculate the width of the key.
Answer
Correct Answer:
25 millimeters
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56. Calculate the maximum shear stress in a circular fillet weld made between a circular rod of 50 millimeters diameter and a plate subjected to a torsional moment of 100 newton millimeters. The size of the weld is 5 millimeters and the diameter of the circular rod is 2 millimeters.
Answer
Correct Answer:
4.5 newtons per square millimeter
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57. In the above drawn Mohrs circle for stress, which is the angle of obliquity?
Answer
Correct Answer:
angle BEA
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58. In which among the following types of gear does the pressure angle remains constant?
Answer
Correct Answer:
involute gear
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59. Calculate the factor of safety of a key in crushing, given that the yield stress in crushing is 400 newtons per square millimeter and crushing stress induced in the key is 100 newtons per square millimeter
Answer
Correct Answer:
4
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60. Which type of nut among the following is used on objects which are subjected to sudden shocks and vibrations?
Answer
Correct Answer:
Castle nut
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61. Calculate the crushing area per rivet, given that the diameter of the rivet hole is 20 millimeters and the thickness of the plate on which the riveting is done is 30 millimeters.
Answer
Correct Answer:
600 square millimeters
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62. What is the value of impact stress on gradually applied loads?
Answer
Correct Answer:
1
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63. Calculate the resilience of a body having a volume of 1000 cubic meters, which is subjected to a stress of 60 newtons per square meter. The Youngs modulus for the material of the body is 2 x 105 newtons per square meter.
Answer
Correct Answer:
9 newtons per meter
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64. __________ theory is relevant to ductile materials.
Answer
Correct Answer:
Von mises
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65. The value of the stress concentration factor for static loading for a lap joint or a butt joint is _____.
Answer
Correct Answer:
1
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66. The value of taper of a gib head key is ___________.
Answer
Correct Answer:
1:100
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67. If the tension on the tight side of a belt is 10 newtons, the tension on the slack side is 5 newtons and the velocity of the belt is 10 meters per second, calculate the power transmitted by the belt.
Answer
Correct Answer:
50 watts
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68. If the shaft diameter is 20 millimeters, calculate the pitch circle diameter of the bolts for a flange coupling.
Answer
Correct Answer:
120 millimeters
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69. If the twisting moment in the hollow shaft is _______ the twisting moment of the solid shaft, then the strength of the hollow shaft becomes equal to the strength of the solid shaft.
Answer
Correct Answer:
equal to
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70. Which property among the following should have the lowest value while selecting a material for sliding contact bearing?
Answer
Correct Answer:
coefficient of thermal expansion
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71. The resistance of a bolt can be increased by _________.
Answer
Correct Answer:
increasing the length of the bolt
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72. Calculate the length of the shaft on which a torque of 10 newton millimeters is applied. The polar moment of inertia on the shaft is 10 (millimeter)4. The angle of twist of the shaft is 10 radians and the modulus of rigidity is 10 newtons per square millimeter.
Answer
Correct Answer:
100 millimeters
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73. If the diameter of a thread is 100 millimeters calculate the core diameter of the thread.
Answer
Correct Answer:
84 millimeters
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74. Calculate the pitch of a thread, given that the number of threads per unit length of screw is 10.
Answer
Correct Answer:
0.1
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75. For a plate thickness ranging between 10 millimeters to 16 millimeters, the minimum weld size will be __________.
Answer
Correct Answer:
6 millimeters
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76. Calculate the bending moment of a circular fillet weld made between a rod of 20 millimeters diameter and a plate. The maximum bending stress on the fillet weld is 100 newtons per square millimeter. The size of the weld is 10 millimeters.
Answer
Correct Answer:
2.2 x 105 newton millimeters
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77. The value of the groove angle of the pulley for rope drive is ___________.
Answer
Correct Answer:
45°
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