menu search
person
thumb_up_alt 0 like thumb_down_alt 0 dislike
110 views

1 Answer

Compensating windings are used in D.C. generators to neutralise the cross-magnetising effect of the armature reaction.

thumb_up_alt 0 like thumb_down_alt 0 dislike
← Prev Question Next Question →

Related questions

Description :

Answer :

If  equalising bar is connected to the 2 DC generators  the current will be equal in 2 generators irrespective of parallel connection so that we connect equaliser bar

thumb_up_alt 0 like thumb_down_alt 0 dislike
136 views 2 answers
Description :

Answer :

In D.C. generators the pole shoes are fastened to the pole core by counter sunk screws.

thumb_up_alt 0 like thumb_down_alt 0 dislike
156 views 1 answer
Description :

Answer :

D.C. generators are connected to the busbars or disconnected from them only under the floating condition to avoid sudden loading of the primemover, to avoid mechanicaljerk to the shaft, to avoid burning of switch contacts.

thumb_up_alt 0 like thumb_down_alt 0 dislike
71 views 1 answer
Description :

Answer :

D.C. generators are installed near the load centres to reduce line losses.

thumb_up_alt 0 like thumb_down_alt 0 dislike
116 views 1 answer
Description :

Answer :

D.C. generators are normally designed for maximum efficiency around full-load.

thumb_up_alt 0 like thumb_down_alt 0 dislike
78 views 1 answer
Description :

Answer :

In D.C. generators the polarity of the interpoles is the same as that of the main pole ahead.

thumb_up_alt 0 like thumb_down_alt 0 dislike
82 views 1 answer
Description :

Answer :

In D.C. generators, the brushes on commutator remain in contact with conductors which lie under interpolar region.

thumb_up_alt 0 like thumb_down_alt 0 dislike
197 views 1 answer
Description :

Answer :

In D.C. generators, current to the external circuit from armature is given through commutator commutator.

thumb_up_alt 0 like thumb_down_alt 0 dislike
142 views 1 answer
Description :

Answer :

For the parallel operation of two or more D.C. compound generators, we should ensure that series fields of all generators should be either on positive side or negative side of the armature.

thumb_up_alt 0 like thumb_down_alt 0 dislike
149 views 1 answer
Description :

In dc machines, the armature windings are placed on the rotor because of the necessity for  (1) electromechanical energy conversion (2) generation of voltage (3) commutation (4) development of torque

Answer :

3  Commutation

thumb_up_alt 0 like thumb_down_alt 0 dislike
214 views 2 answers
Description :

In a DC generator the windings of interpoles are connected :  (A) in series with main field winding, to create a pole,of same polarity as the main pole ahead in the direction of rotation.  (B) in series with main field winding, to create a pole of opposite polarity as the main pole ahead in the direction of ... in the direction of rotation.  (D) in series with the armature winding, to create a pole of opposite polarity as the main pole ahead in the direction of rotation.

Answer :

In a DC generator the windings of interpoles are connected :  in series with the armature winding, to create a pole of same polarity as the main pole ahead in the direction of rotation. 

thumb_up_alt 0 like thumb_down_alt 0 dislike
74 views 1 answer
Description :

In DC generators lamination core are generally made of?

Answer :

In DC generators lamination core are generally made of silicon steel.

thumb_up_alt 0 like thumb_down_alt 0 dislike
163 views 1 answer
Description :

Identify the increasing order of voltage regulation of the following dc generators a same load :  (A) differential compound, shunt and under compound  (B) shunt, differential compound and under compound  (C) under compound, shunt and differential compound  (D) shunt, under compound and differential compound

Answer :

Identify the increasing order of voltage regulation of the following dc generators a same load : under compound, shunt and differential compound 

thumb_up_alt 0 like thumb_down_alt 0 dislike
94 views 1 answer
Description :

Answer :

In A.C. series motor compensating winding is employed to reduce sparking at the brushes.

thumb_up_alt 0 like thumb_down_alt 0 dislike
128 views 1 answer
Description :

Answer :

In a low power factor wattmeter the compensating coil is connected in series with pressure coil.

thumb_up_alt 0 like thumb_down_alt 0 dislike
346 views 1 answer
Description :

Answer :

Burning out of windings is due to short circuited capacitor.

thumb_up_alt 0 like thumb_down_alt 0 dislike
46 views 1 answer
Description :

Why are generators rated in kVA not in kW ?

Answer :

Because It's rating of generator kva is apparent power. Kw is active power which we use. And one is kvar reactive power.

thumb_up_alt 0 like thumb_down_alt 0 dislike
101 views 3 answers
Description :

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done

Answer :

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component of load. To shift part of KVAR from G2 to G1, while keeping terminal voltage fixed, the following action must be done Raise If1 and lower If2

thumb_up_alt 0 like thumb_down_alt 0 dislike
290 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
83 views 1 answer
Description :

Answer :

Large capacity generators are invariably hydrogen cooled.

thumb_up_alt 0 like thumb_down_alt 0 dislike
75 views 1 answer
Description :

Answer :

Generators for peak load plants are usually designed for maximum efficiency at 50 to 75 percent full load.

thumb_up_alt 0 like thumb_down_alt 0 dislike
91 views 1 answer
Description :

The large d.c. motors used in steel rolling mills are always provided with compensating . windings for (a) opposing the armature mmf (b) maintaining the voltage (c) maintaining the speed (d) none of these

thumb_up_alt 0 like thumb_down_alt 0 dislike
88 views 0 answers
Description :

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is (A) 50 Hz (B) 51 Hz (C) 51.25 Hz (D) 51.5 Hz

Answer :

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power characteristics have a common slope of 1 MW/Hz and the no-load frequencies of the generators are 51.5 Hz and 51.0 Hz, respectively. Then the system frequency is 50 Hz

thumb_up_alt 0 like thumb_down_alt 0 dislike
87 views 1 answer
Description :

Answer :

In case of conductively compensated D.C. series motors, the compensating winding is provided in series with armature winding.

thumb_up_alt 0 like thumb_down_alt 0 dislike
83 views 1 answer
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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
140 views 1 answer
Description :

Answer :

Eddy currents are induced in the pole shoes of a D.C. machine due to relative rotation between field and armature.

thumb_up_alt 0 like thumb_down_alt 0 dislike
155 views 1 answer
Description :

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
104 views 1 answer
Description :

Answer :

Iron losses in a D.C. machine are independent of variations in load.

thumb_up_alt 0 like thumb_down_alt 0 dislike
123 views 1 answer
Description :

Answer :

Brushes of D.C. machines are made of carbon.

thumb_up_alt 0 like thumb_down_alt 0 dislike
70 views 1 answer
Description :

Answer :

In D.C. generators, lap winding is used for low voltage, high current.

thumb_up_alt 0 like thumb_down_alt 0 dislike
72 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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
225 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
92 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
174 views 1 answer
Description :

Answer :

In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

thumb_up_alt 0 like thumb_down_alt 0 dislike
112 views 1 answer
Description :

Answer :

To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.

thumb_up_alt 0 like thumb_down_alt 0 dislike
2.9k views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
96 views 1 answer
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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
161 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
397 views 1 answer
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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
627 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
81 views 0 answers
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
134 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
82 views 1 answer
Description :

Answer :

In case of D.C. machine winding, number of commutator segments is equal to number of armature coils.

thumb_up_alt 0 like thumb_down_alt 0 dislike
418 views 1 answer
thumb_up_alt 0 like thumb_down_alt 0 dislike
70 views 0 answers
Description :

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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
147 views 1 answer
Description :

Answer :

In a four-pole D.C. machine alternate poles are north and south.

thumb_up_alt 0 like thumb_down_alt 0 dislike
69 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
246 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
105 views 1 answer
Description :

Answer :

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

thumb_up_alt 0 like thumb_down_alt 0 dislike
380 views 1 answer
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.

thumb_up_alt 0 like thumb_down_alt 0 dislike
349 views 1 answer
editAsk a Question
...