How and when synchronous generator acts as a synchronous condenser?
Latest Answer: When synchronous generator is over exited by connecting an induction motor parallel to it, the generator gives a leading power factor which act as asynchrous condenser, it used where most of load are pure inductive (like motor). ...
Consider you have a tripper at your house. The instant you switch on your motor, the tripper drops. What could be the problem?
Latest Answer: The tripper drops because the motor is an pure inductive load & when we switch ON it, as the properties of inductive load define it oppose sudden change in current so the tripper drops when motor switch is ON. ...
We know synchronous machine run at a constant speed.Consider Synchronous motors, If you load the machine, will the speed reduce? If it does so, then it prohibits the property of synchronism. So Explain
Latest Answer: Synchronous machines cannot self start, it can start only by separate excitation for field windings (Rotor) , by using DC Supply/AC motor/Grid or DAMPER Winding on Poles. ...
Why capacitors are used in 1 phase induction motors?
Latest Answer: In single phase induction motor polyphase winding are used for producing rotating magnetic field (single phase produces alternating flux only) to make motor self startingSince capacitor is used for increasing the starting torque of motor. ...
Why capacitors are not used in 3 phase induction motors?
Latest Answer: In three phase induction motors, capacitors are not needed, because when the current passes through three wires, three magnetic fields will be produced. Due to the interaction between those magnetic fields, RMF will be produced automatically without ...
How many units will a 40W tube consume in 1hr 15 minutes 20 seconds?
Latest Answer: 1 unit=1000 watts.Therefore 40 watts=0.04 units.(40/1000)If the light consumes 0.04 units for 1 hour.then for 15 min it is (0.04/4)=0.01 unitsI calculated this way(1 hr=4*15 min...Then for 15 min(divide 4)).Then for 1 min(0.04/60)=6.66*e-4...Then total ...
Calculate Power Transformer Design for 25kva 33kv/400v
Why transformer does not rotate like induction motor. Inspite both having same principle?
Latest Answer: In induction motor the 3 phase windings are distributed windings where as in a transformer the windings are concentrated windings , a 3 phase distributed winding produces rotating magnetic field where as 3 phase concentrated windind can't. So Rotating ...
Why magnets are used in audio speaker?
Latest Answer: We know audio signals are going be as signals (ac signals are those whose
amplitudes are constantly changing).
The speaker system employs 2 magnets. 1-Electromagnet, 2-Permanant Magnet.
When 2 magnets interact, we know it is subjected to attraction ...
Is current a Vector quantity? If yes, then two wires on 90 degree angle must have resulting current equal to zero.
Latest Answer: According to me, current is neither scalar nor vector completely. It does not obey, vector law of addition. We know kirchoff's law, Current leaving = current entering. So if load is connected at the junction (where 2 wires placed at right angle) current ...
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