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Engineering :: Machine Design

161.  The surface endurance limit of gear material is dependent on its
A. Elastic strength B. Coefficient of friction
C. Surface lubrication D. Surface hardness
E. Toughness    
162.  The maximum efficiency of a scres jack provided with square threads and angle of friction 30? will be
A. 25% B. 33%
C. 41% D. 47%
E. 55.50%    
163.  When the bolt is subjected to shock loading the resilience of the bolt should be considered in order to prevent breakege at
A. Head B. Shank
C. Transition between head and shank D. Threaded portion
E. Anywhere    
164.  When large quantities of bolts are to be purchased the quantity is usually specified in terms of
A. Number B. Volume
C. Packets D. Weight
E. None of the above    
165.  A pivoted segment type thrust bearing is used in order to provide
A. Uniform velocity B. Balanced lead
C. Uniform wear D. Uniform frictional forces
E. A converging film of oil    
166.  By using large thread angles in lifting machine
A. The mechanical advantage will be high B. The load will be sustained in absence of the other
C. The load will be easily lifted D. The mechanical advantage will be low
E. While unloading, little effort will be required    
167.  When a nut is tightened by placing a washer below it, the bolt will be subjected to
A. Compression B. Tension
C. Shear D. BI-axial stress
E. Torque    
168.  Self-tapping screws are generally used in
A. Shear metal work B. Machine tools
C. Automobiles D. Aeroplanes
E. None of the above    
169.  The period during which a cam follower does not move is known as
A. Stationary period B. Free period
C. Constant period D. Fixed period
E. Swell period    
170.  100 m of water column is equal to
A. 10 kN/m2 B. 100 kN/m2
C. 1000 kN/m2 D. 1 kN/m2
E. 0.1 kN/m2    

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