Identify a possible input and possible output for a rotational generator of electricity
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- 23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -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 turnA 240 V, 50 Hz, single-phase capacitor start a.c. motor is loaded such that the ship is 6% The motor constants referred to the stator are: Stator resistance = 2-22; Rotor resistance = 3-852 Stator reactance = 3.0; Rotor reactance = 2-12 Magnetising reactance = 862; Iron and friction loss = 50 W Draw the equivalent circuit and from it find the output power and efficiency at the given loading.
- Which one of the following statements is not correct about synchronous machine Select one: O a. The rotor dc current is required only for synchronous generator O b. The induced voltage in the stator depends on the rotor dc current O. The resistance of the stator windings can be neglected compared with the value of the synchronous reactance If the synchronous motor is overexcited, then: Select one: O a. The motor will absorb reactive power to the source. O b. The motor will operate at unity power factor. O c. The motor will deliver reactive power to the source. O d. The motor will deliver real power to the source.The DC shunt generator with the terminal voltage 300 V, armature drop 9 V and the total brush drop 4 V, then the value of generated emf isWhat is the basic different between the internal characteristics and the external characteristics of d.c shunt generator?