Can you please answer these three questions. Name three types of de motors and make asketch of the connections.Explain what is meant by the generator ef-fect in a motor.What determines the magnitude and polar-ity of the counter-emf in a de motor?

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Answered: Name three types of de motors and make…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter30: Dc Motors

Section: Chapter Questions

Problem 3RQ

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the magnetic strengh of the field poles on a perment magnet DC motor cannot be varied a- true b- false
a. Explain how a rotating magnetic field is produced in a three-phase induction motor. b. Explain the rotor action on a three-phase squirrel cage motor when the load increases from NO-LOAD to rated FULL- LOAD
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1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th contact drop per brush is 1V. then the full-load speed of the motor is -- a) 675 r.p.m. b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
True or fulse
If current taken by series motor is increased from 10 A to 13 A, the percentage increase in its torque is percent, neglecting saturation. О 80 O 39 O 69 O 44 In a DC generator, the effect of armature reaction on the main field is to reverse it distort it O reduce it both (b) and (c)
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M1. Which of the following is the preferred method of changing the direction of rotation of a DC compound motor? a) by reversing the direction of current flow in the armature conductors b) by reversing the polarity of the magnetic field poles c) either "a" or "b" d) neither "a" nor "b M2. If the resistance of a DC motor's shunt-field circuit is increased, what happens to the speed of the motor? a) it speed decreases b) it stays the same c) it speed increases d) none of the above M3. What is a common method of controlling the speed of a DC shunt motor? a) by adding rheostat in series with the armature b) by adding rheostat in series with the shunt field c) could be either "a" and "b" d) neither "a" nor "b"
9. The synchronous speed of a three-Phase induction motor depends on the number of magnetic poles in the machine and the actual speed of rotation the actual speed of rotation and the applied Voltage in RMS the actual speed of rotation and number of magnetic poles intensity on the rotating magnetic field and the applied Voltage in RMS frequency of the applied voltage and the number of magnetic poles in the machine
Please answer question number 3
need asap A dc series motor runs at 1000 rpm when taking 20-A at 200-V. Armature resistance is 0.5-ohm. Series field resistance is 0.02-ohm. Find the speed for a total current of 20-A when a diverter resistor of 0.2-ohm is used across the series field. Flux for a field current of 10-A is 70 % of that for 20-A.

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Name three types of de motors and make a sketch of the connections. Explain what is meant by the generator ef- fect in a motor. What determines the magnitude and polar- ity of the counter-emf in a de motor?