Theory of Machine
A simple spring-mass vibrating system has a natural frequency of fn. If the spring stiffness is halved and the mass is doubled, then the natural frequency will become

fn/2
4 fn
2 fn
8 fn

ANSWER DOWNLOAD EXAMIANS APP

Theory of Machine
The maximum fluctuation of energy is the

Variations of energy above and below the mean resisting torque line
Difference between the maximum and minimum energies
Sum of the maximum and minimum energies
Ratio of the mean resisting torque to the work-done per cycle

ANSWER DOWNLOAD EXAMIANS APP