Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter smaller than the diameter of the unthreaded portion

ANSWER DOWNLOAD EXAMIANS APP

Machine Design
Spring index is

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

ANSWER DOWNLOAD EXAMIANS APP