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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(3) Please don't write on a paper. I can't understand handwritten. 3. HOW MANY NUMBERS OF TURNS PER METER SHOULD BE THERE FOR THE INNER COIL WITH AN AMPERE RATING OF 6A TO CANCEL THE MAGNETIC FIELD STRENGTH OF THE OUTER COIL THAT HAS 35 TURNS PER CENTIMETER AND A CURRENT RATING OF BA?
How can the polarity of an electromagnet be determined if the direction of current flow is known? 2. Define the following terms: 3. flux density 4. Permeability 5. Reluctance 6. Saturation Unit 13 Magnetic Induction 7. Name three factors that determine the amount of induced voltage in a coil. 8. What is the effect on induced voltage of adding more turns of wire to a coil? 9. Into how many time constants is an exponential curve divided? 10. Each time constant of an exponential curve is equal to what percentage of the maximum amount of charge? 11. An inductor has an inductance of 0.025 H and a wire resistance of 3 . How long will it take the current to reach its full Ohm's law value? Unit 15 Alternating Current . 12 What is the most common type of AC waveform? 13 How many degrees are there in one complete sine wave? 14 At what angle does the voltage reach its maximum negative value on a sine wave? 15 A sine wave…
How long a wire is needed to coil a spring having a mean diameter of 1 inch if there are 8 active coils?
What are the two necessary conditions for a thyristor to begin conduction?and Once a thyristor begins to conduct, what condition(s) is necessary to cease conduction? Also, why is the conduction angle greater with an inductive load than with a purely resistive load?
State the Method of connection of different field coils
1. What are the two necessary conditions for a thyristor to begin conduction? 2. Once a thyristor begins to conduct, what condition(s) is necessary to cease conduction? 3. Why is the conduction angle greater with an inductive load than with a purely resistive load?
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. (a) When the switch is “open” i. Where does the current flow in the battery? ii. Where is the magnetic flux going in the bar on the left? iii. Where does the magnetic flux go in the bar on the right? iv. Where does the current flow in the resistor?
The capacitor in the rectifier is chosen such that O a. Time constant CR is ten times of that AC output Supply O b. Time constant CR is ten times of that AC input Supply
Using figures (a) and (b), a magnetic flux density of 0.1 Wb in the air gap Determine the current I in the coil with 200 turns required to produce
Which of the following is NOT a variable in voltametric methods? A. How the current is applied B. How the potential is applied C. The inclusion of convection D. All the above E. Type of working electrode
1. What is the reluctance of 10 cm diameter silicon steel of 2500 permeability with a mean length of 20 cm? A. 0.000201 cgs B. 0.000102 cgs C. 0.000212 cgs D. 0.000123 cgs 2. At what rate the flux must be varied to measure 12 V across the terminal of 300 turns coil? A. 0.05 Wb/s B. 0.04 Wb/s C. 0.03 Wb/s D 0.02 Wb/s
1.Consider the magnetic core below.All dimensions are shown on the figure. The core is made up of legs with 2 different cross-sectional areas.The depth of core is 10cm.The relative permeability of the core is 2000. The current in the magnetising coil is 1 A. The number of turns of the coil is 2000.Calculate: (i)the reluctances and draw the magnetic circuit (ii)the flux in the core (iii)Flux densities B and field intensities H in legs having different cross-sectional areas. (iv)Verify Ampere's Law. Depth: 10 cm I=1A 20cm 2000 Turns 65cm 15cm 15cm 50cm 15cm ndo un of

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