Question: if a current of 1 µ A is passed through the coil. The spring stiffness is 2 × 10<sup>-6</sup> Nm/rad and the displacement constant is 2 Nm/A. the time period of free oscillations in a galvanometer having a relative damping of 0.6 is 2 s. the frequency of damped oscillation is :
Answer:
MCQ: if a current of 1 µ A is passed through the coil. The spring stiffness is 2 × 10<sup>-6</sup> Nm/rad and the displacement constant is 2 Nm/A. the time period of free oscillations in a galvanometer having a relative damping of 0.6 is 2 s. the frequency of damped oscillation is :
Correct Answer:
A. 0.5 rad/s
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Related Questions
- 1. The relative damping in a galvanometer is 0.8 its logarithmic decrement is approximately
- 2. In a critically damped galvanometer the deflection at a time 0.9 times the time of free oscillations after a current is passed through the moving coil is approximately
- 3. The resistance required for critical damping in a circuit is 1000Ω. The galvanometer circuit has a resistance of 800 Ω. Is the galvanometer circuit :
- 4. A galvanometer has a ratio of 0.9 for damped frequency oscillations to undamped frequency of oscillations. Suppose moment of inertia, stiffness constant and damping constant is made twice their original value that would be the new ratio of damped frequency oscillations to undamped frequency oscillations.
- 5. A circuit of 2 µ A is passed through the moving coil of an undamped d’Arsonval galvanometer which has a displacement constant of 2 Nm/A and a control constant of 10 ×10<sup>-6 </sup>Nm/rad. The moving oscillates with an amplitude of :
- 6. If the damping in the d’Arsonval galvanometer is only due to electromagnetic effects,the resistance required for critical damping is _________Where G = displacement constant ; Nm/A, K = control constant ; Nm/rad and J = inertia constant ; kg-m<sup>2</sup>.
- 7. A d’arsonval galvanometer uses a lamp and scale arrangement. Its current sensitivity is 250 mm/µ if the resistance of the coil is 100 Ω. And the external resistance required for critical damping is 900 Ω (which is connected in the circuit), the voltage sensitivity is
- 8. Ayrton shunt is used in d’Arsonval galvanometers so as to limit the current in the galvanometer coil to its maximum permissible value. The relative value of current through the galvanometer coil and the shunt
- 9. A ballistic galvanometer should be designed with
- 10. In a flux meter
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