#Easa part 66 B1,B2 MODULES EXAM MCQs QUESTION BANK

Difference Between AC and DC Generator

1. Design of AC and DC Generator

The stator in DC generators is in form of a hollow roller with magnetic poles on the inside. The rotor consists of a core, a shaft, a winding and a collector. The core consists of mutually insulated dynamo sheets with grooves. The grooves are wrapped in copper wire whose ends are connected to the collector. The collector is in the form of slices attached to the shaft. Carbon brushes move along the collector and can charge/discharge current. The stator of AC generators has on the inside of the roller a longitudinal grooves in which there are windings, in contrast to a DC electromotor where magnetic poles are located. When the current flows through the windings in the stator, a magnetic field appears. The rotor is similar to that of a DC generator, only instead of the collector on the shaft there are two mutually isolated rings. Rotating of the rotor creates alternating current in the stator coils which is passed to the receiver.

2. Application of AC and DC Generator

Dc power machines can work both as a motor and generator. DC generators suppressed the semiconductor rectifier use. AC generators are vastly used for electrical energy generating/transmitting.

AC vs. DC Generator: Comparison to show the difference between AC and DC Generator

..C Generator

1. Current flows in one direction
2. coil is fixed but magnet is rotating
3. power up applances ,electricty generation

..C Generator

1. Current flow periodically changes  direction
2. coil rotates in fixed field
3. power up motors ,battery charging , small power supply