What are synchronous machines that rotate at a speed fixed by the supply frequency and the number of poles called?

Synchronous machines

Fill in the blank: The field winding on the rotor of a synchronous machine is always energized with ______.

Direct current

True or False: The armature winding in synchronous machines is typically on the rotor.

False. The armature winding is on the stator, while the field winding is on the rotor.

What type of synchronous machine typically has a uniform air gap?

Cylindrical rotor synchronous machine

Riddle: I am a device that maintains a constant speed regardless of load changes, thanks to my magnetic field. What am I?

Synchronous motor

Which excitation type allows a synchronous motor to operate at leading power factor?

Overexcited

Fill in the blank: The synchronous speed of a machine is given by the equation Ns = ______.

120f/P

True or False: The generated emf in a synchronous machine lags behind the field flux by 90 degrees.

True

What is the primary advantage of having the armature winding on the stator in synchronous machines?

Better insulation for higher voltages

What does the term 'synchronous reactance' refer to in synchronous machines?

The total reactance presented by the armature winding, including both armature reaction and leakage reactance.

Fill in the blank: The characteristic curve that plots armature current against field current for a synchronous motor is called ______.

V-curve

True or False: Synchronous machines can operate both as motors and as generators.

True

What type of synchronous machine is typically used for high-speed operation?

Cylindrical rotor machine

Riddle: I am the component that helps a synchronous machine start by providing initial torque, but I am not the main motor. What am I?

Damper winding

What happens to the terminal voltage of a synchronous generator when connected to an infinite bus?

It remains constant regardless of the load.