Machine Design
A long helical spring having a spring stiffness of 12 kN/m and number of turns 20, breaks into two parts with number of turns 10 each in both the parts. If the two parts are connected in series, then the softness of the resultant spring will be

30 kN/m
24 kN/m
6 kN/m
12 kN/m

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Machine Design
The creep in the belt is due to

Unequal extensions in the belt due to tight and slack side tensions
Stresses beyond elastic limit of belt material
Material of belt
Effect of temperature on belt

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