Synchronizing Power and Synchronizing Torque

As load angle is increased, degree of stability _________

For a 4-pole 3 phase, 400V alternator has synchronizing power of 300 units. Then the synchronizing power per mechanical degree is

The coupling angle or load angle of a synchronous motor is defined as the space angle between

Which motor can conveniently operate at lagging as well as leading power factor?

Synchronizing power is
(i) Stiffness coefficient of electromagnetic coupling between stator and rotor
(ii) Stability measure of synchronous machine
(iii) Power consumption factor

Synchronizing power is

In a synchronous motor the back emf peak set up in the stator depends on

Which of the following makes synchronizing power to come to play in the machine

An over excited synchronous machine is more stable than under excited

Which of the following is/are used in synchronous machines to maintain mechanical stability?

Variation in the dc excitation of a synchronous motor causes variation in

The operation of a synchronous motor operating on constant excitation across infinite bus will not be stable if power angle δ

Electromagnetic torque is present in rotating machines when

Large stiffness coefficient represents

Consider the below remarks for an alternator
(i) An over excited machine is more stiff
(ii) Machine with longer air-gap is less stable than one with smaller air-gap