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Engineering :: Machine Design


541.  Treads in tyres are provided to
A. increase tyre grip on the road B. prevent skidding on dusty roads
C. prevent skidding on wet roads D. none of the above

542.  The most common material for the balls and races of ball bearings is
A. High carbon steel B. High speed steel
C. high chromium steel D. none of the above

543.  The holding power of sunk key is due to the resistance it differs in
A. shear only B. crushing only
C. tension only D. shear and crushing

544.  Splined shafts are most commonly used in
A. aircrafts B. machine tools
C. automobiles D. none of the above

545.  A shaft coupling should
A. hold the two shafts in perfect alignment B. transmit full power of the shaft
C. have no projecting parts D. have all the above characteristics

546.  A coupling used to connect two perfectly aligned shafts is
A. bush pin coupling B. Oldham coupling
C. rigid tlange coupling D. none of the above

547.  In door shutters, the type of the spring used is
A. close coiled helical spring B. spiral spring
C. conical helical spring D. helical torsion spring

548.  In watches and gramophones, which spring is most commonly used
A. Flat spiral spring B. torsion helical spring
C. conical helical spring D. none of the above

549.  The material of a flt spiral spring is in a state of
A. pure torsion B. pure bending
C. torsion and bending D. none of the above

550.  When a nut is tightened by placing a washer under it, the bolt tends to fall in
A. compression B. tension
C. shear D. none of the above




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