Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F + P
F.P
F
P

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Spring index is

Its capability of storing energy
Indication of quality of spring
Load required to produce unit deflection
Ratio of coil diameter to wire diameter

ANSWER DOWNLOAD EXAMIANS APP