SUBJECT = ELECTRIC MACHINE When an Induction motor starts, the rotor follows the direction of the rotating magnetic field and starts running in the same direction. Explain the statement by giving proper reason.

The armature of a four-pole 200 V, lap wound generator has 400 conductors and runs of 300 rpm. Determine the useful flux per pole. If the number of turns in each field coil is 900, what is the average induced emf in each field coil on breaking its connection if the magnetic flux set-up by it dies away completely in 0.1 second? *

A motor can have different torque characteristics depending on the resistance of the rotor bars and the inductive reactance of the rotor. With this in mind, which of the following is a true statement? A - The resultant flux density in the air gap between the rotor and the stator approaches zero as torque increases. B - As the motor speeds up, inductance is increased because slip and the frequency of the induced EMF is improved. C - The phase angle of the rotor affects the amount of induced current that flows in the rotor and the impedance between the rotor current and induced voltage. D - The impedance of the rotor affects the amount of induced current that flows in the rotor and the phase angle between the rotor current and induced voltage.

A 3-phase, 6-pole, 25 Hz, Y-connected AC generator has a stator with 48 slots, each slot contains 20 conductors. The coils of each phase are connected in series. The flux density is 0.5 T. What is the speed of rotation of the stator magnetic field in RPM? Answer: The speed is: RPM.

I need a clear expert solution, preferably a concise answer supported by the law. a. What is the principle of DC Generators that converts mechanical motion to electrical power? b. Which rule should you use to determine the direction of induced emf across a coil? c. What is the purpose of the commutator? d. Why there is no induced emf across a rotating coil when it passes through the neutral plane? e. What is the component causing a generator to produce de voltage rather than ac voltage at its output terminals? f. At what point should brush contact change from one commutator segment to the next one? j. how many pulsations per revolution should an elementary, single coil, de generator have with output voltage? h. How many commutator segments are required in a two-coil generator? q. How can field strength be varied in a practical de generator? n. What causes sparking between the brushes and the commutator? m. What is armature reaction? 1. What is the purpose of interpoles? p. What is the…

The current generated by the waterwheel generator changes direction as the wheel rotates, that is, it is an alternating current.  Could you design a simple generator like this that would induce a current that continuously flowed in one direction (a DC current)?  If not, explain why not.  If so, describe and sketch your model solution below.