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

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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asked Mar 21, 2018 by anonymous

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

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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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asked Mar 21, 2018 by anonymous

The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm...

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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?

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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asked Mar 21, 2018 by anonymous

In a shunt generator the voltage build up is generally restricted by?

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asked May 25, 2018 by anonymous

A cumulatively compounded d.c. generator is supplying 20 A at 200 V. If the series field winding is short

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A cumulatively compounded d.c. generator is supplying 20 A at 200 V. If the series field winding is short circuited, the terminal voltage will (a) remain unaltered (b) rise to 220 V (c) shoot up to a very high value (d) become less than 200 V

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asked Mar 20, 2018 by anonymous

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

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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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asked Mar 20, 2018 by anonymous

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is?

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Answer :

The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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asked Mar 21, 2018 by anonymous

A D.C. generator can be considered as?

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Answer :

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

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asked Apr 29, 2018 by anonymous

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

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For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Answer :

For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

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asked Mar 21, 2018 by anonymous

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when?

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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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asked Mar 20, 2018 by anonymous

For a D.C. generator when the number of poles and the number of armature conductors is fixed...

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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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asked Mar 20, 2018 by anonymous

A separately excited generator as compared to a self-excited generator?

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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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asked Jul 5, 2019 by anonymous

Why does the speed of a DC shunt motor decrease as the load increases?

Description :

Why does the speed of a DC shunt motor decrease as the load increases?

Answer :

Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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asked Mar 20, 2018 by anonymous

The purpose of retardation test on D.C. shunt machines is to find out?

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Answer :

The purpose of retardation test on D.C. shunt machines is to find out stray losses.

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asked Mar 21, 2018 by anonymous

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

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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asked Mar 21, 2018 by anonymous

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

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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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asked Mar 21, 2018 by anonymous

If a D.C. generator fails to build up the probable cause could not be?

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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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asked Mar 20, 2018 by anonymous

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

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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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asked Mar 20, 2018 by anonymous

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

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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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asked Mar 20, 2018 by anonymous

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

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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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asked Mar 20, 2018 by anonymous

As the load is increased the speed of D.C. shunt motor will?

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Answer :

As the load is increased the speed of D.C. shunt motor will reduce slightly.

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asked Mar 20, 2018 by anonymous

The speed of a D.C. shunt motor can be increased by?

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Answer :

The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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asked Mar 20, 2018 by anonymous

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be?

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Answer :

In a D.C. shunt motor, under the conditions of maximum power, the current in the armature will be more than full-load current.

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asked Mar 20, 2018 by anonymous

The speed of a D.C. shunt motor more than its full-load speed can be obtained by?

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Answer :

The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.

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asked Sep 9, 2017 by anonymous

can induction motor be used as generator?

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Answer :

if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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asked Mar 21, 2018 by anonymous

Armature reaction in a generator results in?

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Answer :

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

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asked Mar 21, 2018 by anonymous

In a separately excited generator supplying rated load the armature reaction?

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Answer :

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

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asked Mar 21, 2018 by anonymous

An exciter for a turbo generator is a?

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Answer :

An exciter for a turbo generator is a shunt generator.

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asked Mar 21, 2018 by anonymous

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

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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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asked Mar 21, 2018 by anonymous

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

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Answer :

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

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asked Mar 21, 2018 by anonymous

The purpose of providing dummy coils in a generator is?

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Answer :

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

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asked Mar 21, 2018 by anonymous

The e.m.f. generated in a D.C. generator is directly proportional to?

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Answer :

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

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asked Mar 20, 2018 by anonymous

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

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Answer :

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

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asked Mar 20, 2018 by anonymous

In a D.C. generator the actual flux distribution depends upon?

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asked Mar 20, 2018 by anonymous

In a D.C. generator the ripples in the direct e.m.f. generated are reduced by?

Description :

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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asked Mar 20, 2018 by anonymous

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

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Answer :

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

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asked Mar 20, 2018 by anonymous

The demagnetising component of armature reaction in a D.C. generator?

Description :

Answer :

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

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asked Mar 20, 2018 by anonymous

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

Description :

Answer :

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

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asked Mar 20, 2018 by anonymous

The condition for maximum efficiency for a D.C. generator is?

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Answer :

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

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asked May 8, 2018 by anonymous

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s.

Description :

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

Answer :

A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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asked May 3, 2018 by anonymous

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance

Description :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is

Answer :

A 200 V dc shunt motor is running at 1000 rpm and drawing a current of 10 A. Its armature winding resistance is 2 Ohm. It. is braked by plugging. The resistance to be connected in series with armature to restrict armature current to 10 A, is 36 Ohm

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asked Mar 20, 2018 by anonymous

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens?

Description :

Answer :

If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

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