Question 21 : The maximum normal stress theory is used for
1. ductile materials
2. non-ferrous materials
3. brittle materials
4. plastic materials
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Question 22 : The rolling contact bearings as compared to sliding contact bearings have
1. accuracy of shaft alignment
2. small overall dimensions
3. low starting and low running friction except at very high speeds
4. all of the above
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Question 23 : When the bearing is subjected to large fluctuations of load and heavy impacts, the bearing characteristic number should be __________ the bearing modulus.
1. 15 times
2. 10 times
3. 20 times
4. 5 times
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Question 24 : Which of the following screw thread is used for power transmission in one direction only.
1. Multiple threads
2. Buttress threads
3. Acme threads
4. Square threads
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Question 25 : The size of a gear is usually specified by
1. circular pitch
2. pitch circle diameter
3. pressure angle
4. diametral pitch
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Question 26 : The taper on cotter varies from
1. 1 in 32 to 1 in 24
2. 1 in 48 to 1 in 24
3. 1 in 24 to 1 in 20
4. 1 in l5 to 1 in 10
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Question 27 : In leaf springs, the longest leaf is known as
1. master leaf
2. none of these
3. lower leaf
4. upper leaf
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Question 28 : The bearings of heavy series have capacity __________ over the medium series.
1. 20 to 30%
2. 30 to 40%
3. 10 to 20%
4. 40 to 50%
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Question 29 : The rolling contact bearings are known as
1. thin lubricated bearings
2. plastic bearings
3. antifriction bearings
4. thick lubricated bearings
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Question 30 : The resistance to fatigue of a material is measured by
1. Young's modulus
2. endurance limit
3. ultimate tensile strength
4. elastic limit
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