Table of Contents
- 1 What is the difference between a shunt generator and a series generator?
- 2 What is the practical difference between a separately excited and a shunt de motor?
- 3 What is the difference between separately excited and self excited DC generator?
- 4 What is the purpose of an exciter?
- 5 What is the difference between the DC series motor and the DC separately excited motor in view of torque and armature current?
- 6 What is difference between DC machine and synchronous machine?
- 7 How are the field windings connected in a DC shunt generator?
- 8 What is the difference between shunt wound generator and series wound generator?
What is the difference between a shunt generator and a series generator?
Shunt DC generators are one which has resistance in parallel(shunt) to the armature. Series DC generators are one which has resistance in series to the armature.
What is the practical difference between a separately excited and a shunt de motor?
A separately excited dc motor is a motor whose field circuit is supplied from a separate constant-voltage power supply, while a shunt dc motor is a motor whose field circuit gets its power directly across the armature terminals of the motor.
What is the difference between a DC series motor and a DC shunt motor?
A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque.
What are the main differences between DC generator and synchronous generator?
The output frequency varies (mostly 50Hz to 60Hz). DC generators produce a low voltage when compared to AC generator which is constant in amplitude and time i.e. output frequency is zero….Also Check:
| Alternating Current (AC) and Direct Current (DC) | Electric Generator |
|---|---|
| The Electric Motor | Electromagnetic Induction |
What is the difference between separately excited and self excited DC generator?
In a separately excited (S.E.) machine, the field winding is connected to a separate voltage source while, in a self excited generator field winding is connected across the armature terminals (provides its exciting current) . Hence, the field winding has a large number of turns with a thin conductor.
What is the purpose of an exciter?
The main purpose of exciter in a generator(alternator) is to provide stationary rotating magnetic field. Which is used to induce the e.m.f in the armature coil. So, DC power is given to exciter and the exciter is nothing but a coil, and the exciter creates a magnetic field.
What are the advantages and disadvantages of a separately excited generator over a self excited generator?
Separately excited DC generators have many advantages over self-excited DC generators. It can operate in stable condition with any field excitation and gives wide range of output voltage. The main disadvantage of these kinds of generators is that it is very expensive of providing a separate excitation source.
What is a separately excited machine?
A separately excited DC generator is the one whose field winding is supplied by an independent external DC source (like a battery). The magnitude of generated voltage depends upon the speed of rotation of armature and the field current, i.e., greater the speed and the field current, higher is the generated voltage.
What is the difference between the DC series motor and the DC separately excited motor in view of torque and armature current?
In separately excited DC motors, the field winding can be excited from a different source of supply altogether. In a series motor both the armature and field winding are connected in series with each other.
What is difference between DC machine and synchronous machine?
The fundamental difference between these two motors is that the speed of the rotor relative to the speed of the stator is equal for synchronous motors, while the rotor speed in induction motors is less than its synchronous speed. The rotor supply used is often DC, which either starts or excites the rotor.
What is the difference between DC generator and DC alternator?
An alternator is a device that converts mechanical energy into AC electrical energy. A generator is a mechanical device which converts mechanical energy to either AC or DC electrical energy. An alternator always induces an alternating current. Alternators have a higher output than generators.
What is the difference between short shunt compound DC generator?
Short Shunt compound dc generator is in which only shunt field winding is in parallel with the armature winding. Long Shunt compound dc generator is in which shunt field winding is in parallel with both series field and armature winding. 3.1. Long shunt Compound Generator
How are the field windings connected in a DC shunt generator?
The field windings within a DC shunt generator are connected in parallel through the armature conductors. Here, the field winding includes a number of windings along with a thin wire including high resistance. The connection of load can be done beyond the armature that is shown in the following diagram.
What is the difference between shunt wound generator and series wound generator?
Current in the field windings of a shunt-wound generator is independent of the load current (currents in parallel branches are independent of each other). Since field current, and therefore field strength, is not affected by load current, the output voltage remains more nearly constant than does the output voltage of the series-wound generator.
How many types of self-excited DC generator are there?
There are three types of self-excited dc generator depending upon the manner in which the field winding is connected to the armature, namely; 1. DC Series Generator In a series-wound generator, the field winding is connected in series with armature winding so that whole armature current flows through the field winding as well as the load.