Question 31 : The backlash for spur gears depends upon
1. pitch line velocity
2. both module and pitch line velocity
3. module
4. tooth profile
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Question 32 : Which of the following statement is wrong ?
1. he power transmitted by V-belts is less than flat belts for the same coefficient of friction, arc of contact and allowable tension in the belts
2. The V-belt drive is used with large centre distance
3. The V-belt may be operated in either direction with tight side of the belt at the top or bottom
4. The ratio of driving tensions in V-belt drive is more than flat belt drives
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Question 33 : The load cup of a screw jack is made separate from the head of the spindle to
1. prevent the rotation of load being lifted
2. reduce the effort needed for lifting the working load
3. reduce the value of frictional torque
4. enhance the load carrying capacity of the jack
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Question 34 : In a hydrodynamic lubricated bearing
1. there is a thick film of lubricant between the journal and the bearing
2. there is no lubricant between the journal and the bearing
3. the lubricant is forced between the journal and the bearing, by external pressure
4. there is a thin film of lubricant between the journal and the bearing
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Question 35 : Stress concentration is caused due to
1. variations in properties of materials in a member
2. abrupt change of cross-section
3. variations in load acting on a member
4. all of these
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Question 36 : Which of the following statement is correct for gears?
1. The pitch circle diameter is equal to the product of module and number of teeth
2. The pitch circle is always greater than the base circle
3. all of the above
4. The addendum is less than dedendum
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Question 37 : The constant factor in case of R10 series of preferred numbers is
1. 1.06
2. 1.12
3. 1.58
4. 1.26
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Question 38 : The pipe joint mostly used for pipes carrying water at low pressures is
1. spigot and socket joint
2. nipple joint
3. union joint
4. socket joint
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Question 39 : Surface endurance limit of gear material is dependent upon its
1. yield strength
2. toughness
3. elastic strength
4. brinell hardness number
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Question 40 : In unilateral system of tolerance, the tolerance is allowed on
1. one side of the actual size
2. one side of the nominal size
3. both sides of the actual size
4. both sides of the nominal size
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