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

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Description :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ (A) directly proportional to α and Φ (B) inversely proportional to α and Φ (C) directly proportional to α and inversely proportional to Φ (D) directly proportional to Φ and inversely proportional to α

Answer :

The no-load speed of a single-phase SCR bridge converter fed separately excited dc motor operating at a firing delay angle, α and flux, Φ directly proportional to α and inversely proportional to Φ

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Description :

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor :  (A) can be operated in first quadrant (B) can be operated in first & second quadrants (C) can be operated in first & fourth quadrants (D) cannot be operated

Answer :

A separately excited dc motor operating in first quadrant is fed from 3-phase semi -converter free -wheeling diode is open circuited, then the motor : can be operated in first & fourth quadrants

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Description :

Separately Excited DC motor

Answer :

Separately Excited DC motor

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Description :

The armature reaction in a synchronous generator supplying leading power factor load is (A) magnetizing (B) demagnetizing (C) demagnetizing and cross-magnetizing (D) magnetizing and cross-magnetizing

Answer :

The armature reaction in a synchronous generator supplying leading power factor load is magnetizing and cross-magnetizing

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Description :

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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Description :

Answer :

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

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Description :

Answer :

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

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Description :

A separately excited dc generator is running at rated speed and at no load. If its field winding is suddenly connected to a dc source then rise in armature generated voltage is governed by (1) Armature time constant (2) Field time constant (3) Both (a) and (b) (4) Mechanical time constant

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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?

Answer :

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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Description :

Answer :

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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Description :

Answer :

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

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Description :

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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Description :

If the load of the normally excited synchronous motor is increased the power factor will?

Answer :

If the load of the normally excited synchronous motor is increased the power factor will become lagging.

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115 views 1 answer
Description :

A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is  (A) magnetizing (B) demagnetizing (C) cross-magnetizing (D) ineffective

Answer :

A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is demagnetizing 

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248 views 1 answer
Description :

Answer :

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

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Description :

Answer :

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

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Description :

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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Description :

Answer :

An over excited synchronous motor on noload is known as synchronous condenser.

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Description :

Why synchronous machine is called doubly excited machine?

Answer :

Armature windings of synchronous machines either deliver 3 phase AC or absorb 3 phase AC source,  whereas field windings are energized from DC source. Thus due to presence of AC on armature and DC on field windings, synchronous machines are often referred as doubly excited machines.

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Description :

If the field of synchronous motor is under excited, power factor will be?

Answer :

If the field of synchronous motor is under excited, power factor will be lagging.

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219 views 1 answer
Description :

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

Answer :

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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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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

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Description :

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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Description :

Answer :

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

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Description :

Answer :

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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Answer :

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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Answer :

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

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Answer :

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 :

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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Description :

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

Answer :

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ohm. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is 0.87

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Description :

Answer :

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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Answer :

An exciter for a turbo generator is a shunt generator.

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Answer :

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

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Description :

Answer :

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

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Description :

Answer :

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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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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Description :

Answer :

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

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Description :

Why is the armature of DC generator laminated?

Answer :

The armature of DC generator is laminated to reduce eddy current losses.

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Description :

Answer :

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

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Answer :

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

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Description :

Answer :

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

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