Question

The oscillation analog control element for a translational damper is ________.
1. damper
2. torque
3. inertia
4. spring

Answer 1

Correct Answer - Option 1 : damper

Damping Torque:

• If the moving system is acted upon by deflecting and controlling torques alone, then the pointer, due to inertia, will oscillate about its final deflected position for quite some time before coming to rest.
• This is often undesirable because it makes it difficult to obtain quick and accurate readings.
• In order to avoid these oscillations of the pointer and to bring it quickly to its final deflected position, a damping torque is provided in the indicating instruments.
• This damping torque acts only when the pointer is in motion and always opposes the motion.
• The position of the pointer when stationary is, therefore, not affected by damping.
• The degree of damping decides the behavior of the moving system either translational or rotational.
• If the instrument is under-damped, the pointer will oscillate about the final position for some time before coming to rest.
• If the instrument is over-damped, the pointer will become slow and lethargic.
• However, if the degree of damping is adjusted to such a value that the pointer comes up to the correct reading quickly without passing beyond it or oscillating about it, the instrument is said to be dead-beat or critically damped.