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An exciter for a turbo generator is a shunt generator.

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Which machine is the exciter of synchronous machine?

Answer :

DC shunt machine is the exciter of synchronous machine.

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Which rotor is use for high speed in turbo alternators?

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Non-salient pole rotor is used for high speed in turbo alternators.

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For a D.C. generator when the number of poles and the number of armature conductors is fixed, then which winding will give the higher e.m.f. ?

Answer :

Wave winding

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The condition for maximum efficiency for a D.C. generator is variable losses equal to constant losses.

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D.C. generator generally preferred for charging automobile batteries is long shunt compound generator.

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Armature reaction in a generator results in demagnetisation of leading pole tip and magnetisation of trailing pole tip.

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If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

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If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be zero.

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In a separately excited generator supplying rated load the armature reaction is always present.

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A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be about 2 V.

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A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will be of 5 Hz.

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In a level compounded D.C. generator, full load terminal voltage is equal to no-load terminal voltage.

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In case of a flat compounded generator voltage remains constant irrespective of the load.

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In a D.C. generator in case the resistance of the field winding is increased, then output voltage will decrease.

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A D.C. generator can be considered as rotating amplifier.

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A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

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In a D.C. generator, the critical resistance refers to the resistance of field.

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Description :

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be?

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The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be 580 V.

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If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.

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The purpose of providing dummy coils in a generator is to provide mechanical balance for the rotor.

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Description :

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?

Answer :

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly 240 V.

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Answer :

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when there is no load on|he generator.

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The e.m.f. generated in a D.C. generator is directly proportional to speed of armature.

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In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when number of poles is 2.

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The armature core of a D.C. generator is usually made of silicon steel.

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In a D.C. generator the ripples in the direct e.m.f. generated are reduced by using carbon brushes of superior quality.

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Magnetic field in a D.C. generator is produced by electromagnets.

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The demagnetising component of armature reaction in a D.C. generator reduces generator e.m.f.

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If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be crossmagnetisation as well as demagnetising.

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Answer :

In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be 8.

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Answer :

A separately excited generator as compared to a self-excited generator is amenable to better voltage control, more stable, has exciting current independent of load current.

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Answer :

In a D.C. generator, the iron losses mainly take place in armature rotor.

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Answer :

The total losses in a well designed D.C. generator of 10 kW will be nearly 500 W.

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The critical resistance of the D.C. generator is the resistance of field.

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In over compounded generator, full load terminal voltage is more than no load terminal voltage.

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Flashing the field of D.C. generator means creating residual magnetism by a D.C. source.

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Answer :

Welding generator will have lap winding.

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A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance to remain constant immediately after the fault, acceleration of the generator rotor is

Answer :

A large AC generator, supplying power to an infinite bus, has a sudden short-circuit occurring at its terminals. Assuming the prime mover input and the voltage behind the transient reactance ... , acceleration of the generator rotor is inversely proportional to the moment of inertia of the machine

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Briefly explain how an electrical generator converts mechanical energy into electrical energy.

Answer :

Working principle of DC generator: * Working principle of DC generator is the principle of dynamically induced emf or electromagnetic induction. * According to this principle, when flux is cut by a conductor, an ... , the flux is cut by the armature winding and an emf is dynamically induced in it. 

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What is the difference between an AC and DC generator?

Answer :

The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

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The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

Answer :

The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator

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Description :

State the function of commutator in DC generator and name the material used for commutator.

Answer :

Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.

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Description :

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when

Answer :

For optimum generator scheduling for different power plants, the minimum fuel cost is obtained when The incremental fuel cost of each plant multiplied by the penalty factor is the same

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Answer :

In D.C. generators on no-load, the air gap flux distribution in space is flat topped.

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Description :

With a neat diagram explain doubly fed induction generator (DFIG). 

Answer :

Diagram of Doubly fed induction generator (DFIG):  Explanation :-  DFIG can feed power through the stator as well as rotor to the grid. The stator is directly connected to the fixed frequency ... voltage is 690 V AC. So it must be step up to 33 KV to connect to power grid.  

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Description :

Explain the choice of size and number of generator units in a power plant. 

Answer :

Selection of Size and Number of Generating Units:  1. The size/rating and number of generating units in such way that they approximately match with the load curve/load duration curve as ... power plant is connected to grid system then generating unit of higher capacity can be installed.

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Description :

Explain Squirrel Cage Induction Generator (SCIG) and also draw a diagram. 

Answer :

Explanation (Operation):- In this system gearbox is used to increase the speed of high speed shaft as per design. IG require reactive power for excitation. Rotor of SCIG is ... , variable voltage output of the generator into the fixed frequency, fixed voltage output required for grid. 

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Description :

Draw a labeled block diagram of sine wave generator and state function of each block. 

Answer :

Function Generator:  This instrument can deliver sine, triangular & square waves with frequency range of 0.01 Hz to 100 kHz.  The frequency control network is governed by a frequency ... voltage reaches a predetermined level on the negative slope of the integrator's output voltage.

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332 views 1 answer
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