MCQs on Alternator
1. Alternator operates on the principle of
- electromagnetic induction
- self induction
- mutual induction
- self or mutual induction
2. In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is
- synchronous motor
- synchronous generator
- asynchronous motor
- asynchronous generator
3. The armature of an alternator
- is a stationary member
- is a revolving member
- is the frame
- consists of the winding into which current is induced
4. In modern alternators, the rotating part is
- field system
- armature
- armature as well as field system
- none of the above
5. The current from the stator of an alternator is taken out to the external load circuit through
- slip rings
- commutator segments
- solid connections
- carbon brushes
6. Which one of the following is the primary reason for placing field on rotor in an alternator?
- small power in the field circuit
- insulation of high voltage is made easy on stator than on rotor
- large power in stator
- large current in stator
7. Which type of alternator is used in hydroelectric power stations?
- non-salient pole alternator
- turbo generator
- salient pole alternator
- steam turbine alternator
8. In a synchronous machine, the stator frame is made of
- stainless steel
- CRGOS
- cast iron or welded steel plates
- laminated silicon steel
9. The stator core of an synchronous machine is built up of ______ laminations
- stainless steel
- silicon steel
- cast iron
- cast steel
10. The stator core stampings also have openings which make ______ ventilating ducts to provide efficient cooling.
- axial
- radial
- axial as well as radial
- none of the above