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Engineering :: Machine Design


61.  According to Indian Boiler Regulations the essential requirement of any safety valve is that
A. It should have good appearance B. It should be located outside the boiler room
C. It should be costly D. It should be visible to boiler operator from all positions in the boiler room
E. Its area should be sufficient to discharge the steam as quickly as it is generated with rise in pressure not more than 10% of the safety valve blow off pressure    

62.  The blow off pressure of a safety valve is
A. Slightly above atmospheric pressure B. Half of the boiler working pressure
C. Boiler working pressure D. 106% of boiler working pressure
E. 2 x boiler working pressure    

63.  In case of a cotter joint the compressive load is transmitted from one rod to another rod
A. Directly B. Via cotter
C. Via cotter pin D. Via collar
E. None of the above    

64.  In a cotter joint in order to ensure that cotter does not work back
A. Shear pins should be applied on the cotter B. Cotter should be made thick
C. Cotter should be made of stronger material D. The taper on cotter should not exceed 1 in 24
E. The taper on cotter should be more than 1 in 24    

65.  A foundation bolt with a circular end is secured to the floor by means of a steel cotter. If the pull on the bolt is 14000 kg, the diameter of the bolt should be
A. 10 mm B. 20 mm
C. 30 mm D. 50 mm
E. Double shear    

66.  In case of a knuckle joint the pin is likely to fail in
A. Compression B. Crushing
C. Tension D. Shear
E. Double shear    

67.  The pin supporting the exhaust iever of an internal combustion engine is subjected to a shear load of 400 kg/sq-cm the diameter of the pin should be
A. 1 cm B. 1.5 cm
C. 2 cm D. 4 cm
E. 6 cm    

68.  In case of a Saddle key
A. The key way is cut in shaft only B. The key way is cut in both shaft and hub
C. The key is welded to shaft D. The key ways is cut in hub only
E. The key is made of flexible material    

69.  The holding power of a saddle key is due to
A. Tensile force B. Compressive force
C. Torsion D. Shear force
E. Friction force    

70.  In case of sunk key
A. The key way is cut in shaft only B. The key way is cut in bub only
C. The key way is cut in both shaft and hub D. The key way is helical along the shaft
E. The key is in two parts    




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