If False please provide the reason I will rate the answer th

If False please provide the reason. I will rate the answer that get\'s the most correct as I can check instantly once I submit the answer. Thank you.

Question: In a synchronous generator... Answer (a) True (b) False (a) True (b) False (a) Yes (b) No (a) True (b) False The rotor angular velocity is synchronized with the grid frequency 2.2 An over excited generators has a positive power factor angle 2.3 Change in the field winding current effects the induced armature voltage 2.4 If the mechanical power in a generator shaft is kept constant, the power angle will not change 2.5 The \'pullout power\' refers to the minimal power for which the system will fail and shutoff (a) True (b) False

Solution

2.1 ) True

because in synchronisation the frequency of generator should be synchronized with grid frequency

as frequency depends on velocity of rotor they should be synchronised

2.2) False

Over excited generator supplies lagging current to the system which means angle is negative with respect to voltage.From the vector diagram one can prove this

2.3)Yes

Change in field current changes flux as induced voltage proportional to flux as per faradays law ,voltage changes

2.4)True

To run generator in stable condition input power equal to output power +losses,as input mechanical power is kept constant the power angle should be constant for stable operation to maintain constant output power

2.5)True

The reason is as given in the statement