The figure shows the single-line diagram of a synchronous generator delivering  of power at unity power factor to an infinite bus.

 denotes the stator current phasor. If the field excitation is increased, which one of the following options correctly describes its effect on the stator current, power factor, and load angle of the machine?

The induced emf in a  pole, 3-phase star connected synchronous motor is considered to be equal and in phase with the terminal voltage under no load condition. On application of a mechanical load, the induced emf phasor is deflected by an angle of  mechanical with respect to the terminal voltage phasor. If the synchronous reactance is , and stator resistance is negligible, then the motor armature current magnitude, in ampere, during loaded condition is closest to, _________ (round off to two decimal places).

A three-phase, 50 Hz, star-connected cylindrical-rotor synchronous machine is running as a motor. The machine is operated from a 6.6 kV grid and draws current at unity power factor (UPF). The synchronous reactance of the motor is  per phase. The load angle is 30 degrees. The power delivered to the motor in kW is __________.

(Give the answer up to one decimal place).

A three-phase, 11 kV, 50 Hz, 2pole, star connected, and cylindrical rotor synchronous motor is connected to an 11kV, 50 Hz source. Its synchronous reactance is  per phase, and its stator resistance is negligible. The motor has a constant field excitation. At a particular load torque, its stator current is 100A at unity power factor. If the load torque is increased so that the stator current is 120 A, then the load angle (in degrees) at this load is __________.

A synchronous generator is connected to an infinite bus with excitation voltage . The generator has a synchronous reactance of 1.1pu and is delivering real power (P) of 0.6 pu of the bus. Assume the infinite bus voltage to be 1.0pu. Neglect stator reactance. The reactive power (Q) in pu supplied by the generator to the bus under this condition is _______________.

A 1000 kVA, 6.6 kV, 3-phase star connected cylindrical pole synchronous generator has a synchronous reactance of 20 Ω. Neglect the armature resistance and consider operation at full load and unity power factor.        

The power (or torque) angle is close to?

A 5 MVA, 11 kV, 3-phase star connected alternator is synchronized to the bus bars and is operating with an induced EMF of 125% of the rated voltage. If the load current is 500A, what is the power factor of operation? The machine has a synchronous reactance of 5Ω and negligible resistance per phase.

A synchronous motor on load draws a current at a leading power factor angle . If the internal power factor angle- which is the phase angle between the excitation e.m.f. and current in the time phasor diagram is  then the air gap excitation m.m.f lags the armature m.m.f by

The torque angle of a synchronous machine operating from a constant voltage bus, is usually defined as the space angle between