Machine Design

121. The ultimate strength of steel in tension in comparison to shear is in the ratio of

1. 1 : l
2. 2 : 1
3. 3 : 2
4. 2 : 3
5. 1 : 2

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122. The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

1. 0.01 micron
2. 0.1 micron
3. 1 micron
4. 10 microns
5. 25 microns.

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123. The valve rod in a steam engine is connected to an eccentric rod by

1. cotter joint
2. bolted joint
3. kunckle joint
4. universal coupling
5. gib and cotter joint.

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124. Three different weights fall from a certain height under vacuum. They will take

1. same time to reach earth
2. times proportional to weight to reach earth
3. times inversely proportional to weight to reach earth
4. unpredictable
5. none of the above.

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125. Transverse fillet welded joints are designed for

1. tensile strength
2. compressive strength
3. shear strength
4. bending strength
5. torsional strength.

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126. Turn buckle has

1. right hand threads on bout ends
2. left hand threads on both ends
3. left hand threads on one end and right hand threads on other end
4. no threads
5. threads in middle portion.

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127. When a bolt is subjected to shock loading, the resilience of the bolt should be considered in order to prevent breakage at

1. shank
2. head
3. in the middle
4. at the thread
5. anywhere in the bolt.

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128. When a close coiled helical spring is compressed, its wire is subjected to

1. tension
2. shear
3. compression
4. all of the above
5. none of the above.

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129. When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads

1. compression
2. tension
3. shear
4. combined loads
5. all of the above.

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130. When two springs are in series (having stiffness K), the equivalent stiffness will be

1. K
2. K/2
3. 2K
4. KIA
5. UK.

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