Question

POR2-QUESTIONS FOR GENERATORS Answer True or False for the following. (Mechancal inbo Eleetvical) 1) Generators Convert Thermal energy into Electrical energy. x 2) Increasing the speed of rotation of the magnet increases the rate of change of flux and higher voltage is induced. The same increase in voltage may be accomplished with out changing the speed, but by using a strong magnet. 3) The order or sequence in which the voltage waves of the three phases reach their max positive values is called the phase Sequence. 4) The links are provided in the insulated phase bus duct to allow complete isolation of the generator from external parts. 5) In our plant we have two gas turbines and three steam turbines. 6) The advantage of stationary armature and rotating field in Generators is to provide Slip ring/brush arrangement for the out put terminals. 7) When Generator excitation is varied the load on the Generator also varies accordingly. lagging power factor on infinite bus if the 8) When the M/c is operating excitation is goes on reduced the power factor will go to leading. on 9) The brush gear comprises plug in brush holders enabling worn carbon brushes to be replaced during operation at full speed and load. 10) The cooling air for the generator is drawn by axial- flow fans arranged on the rotor via lateral openings in the stator housing. The cooling air flow is divided into three flow paths after each fan. 11) De humidifier intended to maintain the temperature of the air in the generator above the dew point level, and to prevent any condensation in the generator interior while the unit in service. 12) All generator bearings are provided with a hydraulic shaft lift oil system to reduce bearing friction during startup and turning gear operation 13) In our plant the rotor earth fault protection is of injection method not the potentiometer method type of protection.

Answer 1

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