Q3 If the resistance of the moving coil device 20 2 and the total deviation of theindex is 120 degree when shedding effort 100 mV across both ends of the deviceand the dimensions of the file were 2.6 * 3.1 em, the number of turns 120 and thedensity of the electromagnetic flux 0.15 wb/m1- Calculate the control constant of the spring at rest.2- List the two types of moving coil instruments.

The objective of the question is to calculate the control constant of the spring at rest in a moving…

Answered: Q3 If the resistance of the moving coil…

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 17SQ

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Shown magnetic circuit has current 10 A in the coil of 2000 turns. Assume all branches have the same cross-section of 2 cm2 and material of the core is iron with ur-1500. a) Draw the equivalent electrical circuit. 10 cm 12 cm 1 cm 2 cm 0.6 cm
A)The left hand rule for a coil is such that if you were to hold a coil in your left hand with your fingers pointing in the direction of the electron flow, your thumb would point in the direction of thea) electron flow b) flow lines c) face of the north pole d) none of the above. B) What is a magnetic flux line?a) It is the space around a magnet or the space in which the magnetic forces act.b) It is the magnetic force that has a definite direction at all points along a curved line from the north to south pole.c) It is the ability of a magnetic material to be easily magnetized.d) none of the above C)It is believed that a magnetic material is .........a) consists of a single large magnetic molecule b) is composed of many tiny magnetic molecules c) consists of a single non-magnetic molecule d) none of the above
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?
Consider Figure 3.5. Match the following, those on the left to those on the right. (i) Im (a) Exciting current (ii) Ic (b) Magnetizing Current (iii) Ie (c) core loss current
What is the difference between a thermal overload and a magnetic overload? Draw the symbol for each.
Look carefully at the figure and answer the following questions. For your answers choose between on the right, on the left and it is zero; there are no more options. Clearly explain your answers. A) When the switch is closed i. Where does the current flow in the battery? ii. Where is the magnetic flux going in the bar on the left? iii. Where is the magnetic flux going in the bar on the right? iv. Towards where the current flows in the resistor?
Please answer it in 30 mins. thank youu write your soln neat and complte
3. How does a split ring commutator work? * Coll rotation Coil Commutator a) Swaps the contact every full turn, so that the left-hand and right-hand arms of t coil always experience a force in the same direction. b) Swaps the contact every half turn, so that the left-hand and right-hand arms of coil do not experience a force in the same direction. c) Swaps the contact every half turn, so that the left-hand and right-hand arms of coil always experience a force in the same direction.
The magnetic Frame shown is built up of iron of square cross-section, 3cm side. Each air gap is 2mm wide. Each of the coil is wound with 1000 turns and exciting current is 1.0 A. The relative permeability o part A and part B may be taken as 1000 and 1200 respectively. Calculate the flux set-up in the circuit. Part-A 3 cm 2 mm K -Part-B 20 cm 10 cm-
A resistance of the coil is 500 and the number of turns 200 turns, connecting in a row with a resistive galvanometer 3000, and placed in the magnetic field amount of 2 mWb. Find the value of current in the coil when moving during 0.2 sec to 0.6 mWb.
Determine the current, I, in figure 3 required to establish a flux in the gap of fg=2´10-4 Wb in the magnetic circuit of the following figure.
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