Question 51 : A bolt of uniform strength can be developed by
1. keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
2. keeping the core diameter smaller than the diameter of the unthreaded portion
3. keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
4. none of the above
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Question 52 : The ratio of endurance limit in shear to the endurance limit in flexure is
1. 0.25
2. 0.55
3. 0.7
4. 0.4
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Question 53 : Tapered roller bearings can take
1. both radial and axial loads and the ratio of these being greater than unity
2. axial load only
3. radial load only
4. both radial and axial loads and the ratio of these being less than unity
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Question 54 : If a bearing is designated by the number 305, it means that the bearing is of
1. light series whose bore is 5 mm
2. light series whose bore is 25 mm
3. medium series whose bore is 5 mm
4. medium series whose bore is 25 mm
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Question 55 : In order to remove internal stresses produced by hardening the steel, the process usually adopted is
1. annealing
2. normalising
3. spheroidising
4. tempering
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Question 56 : Which of the following statement is correct ?
1. The toughness of a material increases when it is heated.
2. The shear stress in a beam varies from zero at the neutral surface and maximum at the outer fibres.
3. The stress concentration in static loading is more serious in brittle materials and less serious in ductile materials.
4. The stress concentration in static loading is more serious in ductile materials and less serious in brittle materials.
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Question 57 : The radial distance of a tooth from the pitch circle to the top of the tooth is called
1. clearance
2. dedendum
3. working depth
4. addendum
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Question 58 : In a gear, having involute teeth, the normal to the involute is a tangent to the
1. pitch circle
2. base circle
3. addendum circle
4. dedendum circle
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Question 59 : A sliding bearing which operates without any lubricant present, is called
1. zero film bearing
2. hydrostatic lubricated bearing
3. boundary lubricated bearing
4. hydrodynamic lubricated bearing
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Question 60 : The difference between the tooth space and the tooth thickness as measured on the pitch circle, is called
1. working depth
2. face width
3. clearance
4. backlash
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