73.
The rotating shafts tend to vibrate violently at whirling speeds because

74.
In a screw jack, the effort required to lift the load W is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

75.
The efficiency of a screw jack is maximum, when (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)

77.
The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft and $$\alpha $$ = Semi-angle of the cone)

79.
The Whitworth quick return motion mechanism is formed in a slider crank chain when the

80.
The arrangement is called bevel gearing, when two __________ are connected by gears.

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