Question: In d’Arsonval galvanometer, an iron core is usually used between the permanent magnet pole faces. This is used so that
Answer:
MCQ: In d’Arsonval galvanometer, an iron core is usually used between the permanent magnet pole faces. This is used so that
Correct Answer:
A. Flux density in the air gap becomes high therby a large deflecting torque is produced
Discuss a Question
Related Questions
- 1. Sometimes, d’Arsonval galvanometers, do not use ferromagnetic cores between poles of the permanent magnet. In this case
- 2. A d’Arsonval galvanometer uses a light and scale arrangement. The light source is placed 1 m away from the moving system of galvanometer. The arrangement uses a circular scale calibrated in mm. the deflection indicated by the scale is
- 3. 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 :
- 4. The relative damping in a galvanometer is 0.8 its logarithmic decrement is approximately
- 5. 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
- 6. The resistance required for critical damping in a circuit is 1000Ω. The galvanometer circuit has a resistance of 800 Ω. Is the galvanometer circuit :
- 7. 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.
- 8. 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 :
- 9. 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>.
- 10. 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
You may be interested in:
Electrical and Electronics Measurements and Instrumentation MCQsRecently Added Articles
How Do Java Development Teams Use Docker and Kubernetes to Deploy Applications?
Last updated on: April 24, 2026Posted by: ExamRadar
AI vs Machine Learning: Key Differences Every Professional Should Know
Last updated on: February 13, 2026Posted by: ExamRadar
Office Cleaning Services That Elevate Sydney Offices
Last updated on: February 11, 2026Posted by: ExamRadar
What You Actually Learn About Exam Patterns From RBI Grade B Previous Year Papers?
Last updated on: February 9, 2026Posted by: ExamRadar
Mental Health Support That’s Closer Than You Think
Last updated on: January 7, 2026Posted by: ExamRadar
Transform Your Home’s Exterior with Columbus roofing company
Last updated on: November 27, 2025Posted by: ExamRadar
