A moving coil mili voltmeter has a resistance of 20 ohm and full scale deflection of 120 degrees is reaches when the p.d of 100V is applied across it's terminals. The moving coil has effective dimensions of 3.1cm x2.6cm and wound with 120 turns. The flux density in the air gap is 0.15 Weber per meter squared. Determine the control constant of the spring and suitable diameter of copper wire for a coil winding if 55% of the total instrument resistance is due to coil winding given resistivity of 1.73*10-8 ohm meter

A moving coil mili voltmeter has a resistance of 20 ohm and full scale deflection of 120 degrees is reaches when the p.d of 100V is applied across it's terminals. The moving coil has effective dimensions of 3.1cm x2.6cm and wound with 120 turns. The flux density in the air gap is 0.15 Weber per meter squared. Determine the control constant of the spring and suitable diameter of copper wire for a coil winding if 55% of the total instrument resistance is due to coil winding given resistivity of 1.73*10-8 ohm meter

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter8: Basic Electric Motors

Section: Chapter Questions

Problem 3RQ

See similar textbooks

Similar questions

10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature coefficient at 15'C is equal to 1/254.5 per °C
Q9 / What are the function of brushes , pole and commutator in DC machine
An iron ring elecromagnet has a relative permeability of 1250 when it is excited by a coil having 500 turns at 0.8 A. the mean length of iron parts is 48 cm, the cross-section of the core is 10 square cm and the air gap is 0.5 cm. What is its total reluctance?
In a coil with radius of 6 cm and 400 turns, there is a magnetic field leaving in a direction perpendicular to the area of the turn with a value of de 0.232t + 4x10-5t4. The resistance of the coil is 100 2. Find the EMF after 10 s.
Solve it quickly please
A magnetic coil produces 100,000 maxwell with 2000 turns and with a current of a 2A. The current is cut-off and the flux collapse in 0.01 sec. What is the average voltage that will appear across the coil?
Help fast pls
A magnetic ring has reluctance of 1.675 × 10⁰ AT weber. The flux to be produced by the coil is 800 x 10 webers, then the AT required for the m.m.f. will be
A toroidal coil, with a circular cross-sectional area of 0.2m2. The coil inductance is 0.28H. The coil has 500 turns. How much current should flow in the coil to get a flux linkage of 498? a. 498.000 A b. 140.000 A c. 1778.571 A d. 249000.000 A e. 889285.714 A
Answer the question quecly please High voltage
A current in a 250 turn coil is 2.25A, wound in a core that has a reluctance of 12,000 AT/Wb. What is the resulting flux density (in Tesla), if the area of the core is 8cm²?
A coil is used for producing a flux of 0.24 x 10 webers. If the current flowing in the coil is 2 amp and the coil has 200 turns. the total m.m.f required to produce the flux will be