ALTERNATOR MODULE 1

Alternator is a

• AC MOTOR

• AC GENERATOR

• AC AND DC GENERATOR

• DC GENERATOR

The output of alternator is taken from

• Rotor

• Stator

• Shaft

• Slip ring

The direction of induced emf in a alternator can be found out using

• Fradays law of electromagnetic induction

• Flemings Right hand rule

• Fllemings Left hand rule

• None of these

Which formula is used to calculate EMF/phase in a ideal alternator?

• 𝐸=𝜙𝐹𝑇 / 2.22​  

• 𝐸=𝜙𝐹𝑇/4.44

• 𝐸=4.44𝜙𝐹𝑇

• 𝐸=2.22𝜙𝐹𝑇

What is the supply frequency of an alternator having 6 poles runs at 1000 rpm

• 25Hz

• 50Hz

• 25Hz

• 40Hz

What is the supply frequency in Hertz of an alternator having 4 poles runs at 50 revolutions per second

Name the type of rotor shown in figure

• Cylindrical rotor

• Salient pole type rotor

• Squirrel cage rotor

• Slip ring rotor

What is the name of the equipment that provides D.C to the rotor of alternator?

• Synchroniser

• Exciter

• Inverter

• Converter

The type of Alternator used in power plant shown is

• Cylindrical rotor type

• Salient pole type

• Squirrel cage type

• None of these

In synchronous machines, the salient poles are

• stationary field winding

• rotating field winding

• rotating armature winding

• stationary armature winding