Calculate the no-load speed of a permanent magnet DC motor which runs at 932 rpm under rated load and has a speed regulation of 7.3%.
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- A DC motor has a rotor and field coils connected in series with a resistance of 3.2 Ω. When it spins at full load on a 120 V line, the emf rotor is equal to 105 V. (a) What is the current that the motor receives from the line? (b) What is the power required for the engine? (c) What is the mechanical power developed by the engine?When you move a magnet through a 1 loop coil you detect a voltage of 0.001 volts, what voltage would you read if you move the same magnet at the same velocity through a coil with 1000 loops (assume the radius of the loops in the coil is the same as the one in the single loop wire)a Figure 9 shows a single-loop DC motor. Determine the direction of rotation of the loop. (12.6) Figure 9 b) What should the external magnet poles be in order for the motor in Figure 10 to spin counterclockwise? (12.6) TA Figure 10
- A solenoid (made as a long coil) is a type of electromagnet, the purpose of which is to generate a controlled magnetic eld through a coil wound into a tightly packed helix. Now calculate the self-inductance if the number of windings are 100 of a 5.0 cm long solenoid with cross-sectional area of 0.30 cm2.An inductor consists of 100 turns of wire tightly wound about an insulating core. It is attached to a power supply and when the current through it is increased from 0 to 5 A in 3, s an induced emf of 5 V is measured. Find the inductance of this device and the magnetic flux and the energy stored in the magnetic field when the current is held steady at 5 A.Sign in to O X Interval Spo X O Apr. 9: Fara X O Faraday.pdf x Faraday.pdf x HW 19 in mechanical X M (no subject) x PDF File | C:/Users/Colin/Downloads/Faraday.pdf 2) A rectangular coil with resistance R has N turns (loops), each of length e and width w as shown in the figure. The coil moves into a uniform magnetic field B with constant velocity v. Find the magnitude and direction of the total magnetic force on the coil (a) as it enters the magnetic field (i.e. partially immersed), and (b) as it moves (totally immersed) within the magnetic field. B. Pexternal 8:08 AM O Type here to search 62% hulu 4/9/2021 7.
- Suppose you have a motor with a power factor significantly less than 1. Explain why it would be better to improve the power factor as a method of improving the motor’s output, rather than to increase the voltage input.What is wrong with this scheme? To generate electricity without fuel, arrange a motor to operate a generator that will produce electricity that is stepped up with transformers so that the generator can operate the motor and simultaneously furnish electricity for other uses.A motor is designed to operate on 117 V and draws a current of 12.2 A when it first starts up. At its normal operating speed, the motor draws a current of 2.30 A. Obtain (a) the resistance of the armature coil,(b) the back emf developed at normal speed, and (c) the current drawn by the motor at one-third of the normal speed.
- A coil with a self-inductance of 3.0 H and a resistance of 100 Ω carries a steady current of 2.0 A. (a) What is the energy stored in the magnetic field of the coil? (b) What is the energy per second dissipated in the resistance of thecoil?A motor is designed to operate on 117 V and draws a current of 9.39 A when it first starts up. At its normal operating speed, the motor draws a current of 1.73 A. Obtain (a) the resistance of the armature coil, (b) the back emf developed at normal speed, and (c) the current drawn by the motor at one-third normal speed.A dc motor with its rotor and field coils connected in series has an internalresistance of 2.00 Ω. When running at full load on a 120 V line, itdraws a 4.00 A current. What is the mechanical power developed?