Alternators MCQs

3-phase Y-connected synchronous generator has a rated voltage of 21.5 kV at 0.85 pf. The line current when operating at full load rated

In relation to the synchronous machines, which one of the following statements is false?

The voltage across the open-circuited field terminals of a synchronous machine under slip test is

In a synchronous generator operating at zero pf !aging, the effect of armature reaction is

Following a sudden short-circuit at the terminals of a 3-phase unloaded synchronous generator, the initial effect of the pole-face damper winding, is to

Short-circuit ratio of a synchronous machine is the ratio of the

For proper synchronisation of a large synchronous machine to a bus, the frequency of the incoming machine

A 3-phase alternator delivers power to a balanced 3-phase load of power factor 0.707 lagging. It is observed that the open-circuit emf phasor leads the corresponding terminal voltage phasor by 15?. Neglecting the effect of harmonics, the angle between the axis of the main field mmf and the axis of the armature mmf will be

A 3-phase, 400 V, delta connected alternator has a synchronous impedance 01 (0 +j20) ohms per phase. If it delivers a balanced load of 12 kVA at zero power factor leading, then the percentage voltage regulation of the alternator is equal to