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- What is the difference between wound rotor induction machines and squirrel cage machines(2) lehäi Q5// A 4 pole lap - winding dc shunt generator has an armature winding consisting of 220 turns each of 0.004 ohm. the armature resistance * is 0.5 ohm 1 ohm O 0.025 ohm O 0.055 ohm O (2) abäi Q6// in shunt circuit output to * input is Vla/Eala VIL/Eala Eala/Vla none of the above ORotor speed at no load.
- Why does the speed change as the load changes in the D.C series motorA 3-0, 6 pole, 50 Hz IM has a rotor speed of 987 rpm. Find rotor frequency? E) 60 Hz. F) 0.65 Hz. G) 0.75 Hz. H) 0.70 Hz.A 1-φ induction motor is being used to pump water in a multi-storied building. You need to select a starting method for the motor. Justify your selection with proper reasons
- As speed of D.C motor is increased the back EMF --and current drawn - decreases, decreases O decreases , increases increases , decreases O increases, increases The speed of a d.c. motor is Inversely proportional to the applied voltage Directly proportional to flux per pole None of the answers O Inversely proportional to flux per pole7- Does the frequency of the generated voltage depend on the rotor speed? Explain. 8- Draw the circuit diagram onous generator workWhat can you learn about parallel and series connection in making a wind turbine?
- Why does a salient rotor have ?more polesWhy do motors have gaps or breaks throughout the rotor and commutator? It makes the motor cheaper since not as much material is needed. Only some sections of the rotor will act as electromagnets, causing the rotor to always be pushed in the same direction. It allows some of the magnetic field to escape so that rotor doesn't get too stressed. It lets air into the motor to keep it cool since the electricity can make it hot. It happens when rotors don't use enough oil, so they crack.3.4 The rotor power output of 3-phase induction motor is 15 k. The rotor copper losses at a slip of 4% will be (a) 600 W (c) 650 W (b) 625 W (d) 700 W