In D.C. generators the polarity of the interpoles?

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In D.C. generators the polarity of the interpoles?

asked Mar 20, 2018 by anonymous

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asked Mar 21, 2018 by anonymous

When two D.C. series generators are running in parallel, an equilizer bar is used?

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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

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asked Mar 20, 2018 by anonymous

Compensating windings are used in D.C. generators?

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Answer :

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

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110 views 1 answer

asked Mar 20, 2018 by anonymous

In D.C. generators, the brushes on commutator remain in contact with conductors which?

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Answer :

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

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197 views 1 answer

asked Mar 20, 2018 by anonymous

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

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Answer :

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

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142 views 1 answer

asked Mar 20, 2018 by anonymous

In D.C. generators the pole shoes are fastened to the pole core by?

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Answer :

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

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156 views 1 answer

asked Mar 20, 2018 by anonymous

For the parallel operation of two or more D.C. compound generators, we should ensure that?

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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.

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146 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. generators are connected to the busbars or disconnected from them only under the floating condition?

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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.

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71 views 1 answer

asked Mar 20, 2018 by anonymous

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

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Answer :

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

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116 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. generators are normally designed for maximum efficiency around?

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Answer :

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

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78 views 1 answer

asked Apr 29, 2018 by anonymous

In a DC generator the windings of interpoles are connected :

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.

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asked Mar 3, 2018 by anonymous

In DC generators lamination core are generally made of?

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In DC generators lamination core are generally made of?

Answer :

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

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161 views 1 answer

asked Apr 30, 2018 by anonymous

Identify the increasing order of voltage regulation of the following dc generators a same load :

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

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94 views 1 answer

asked Sep 7, 2018 by anonymous

What is the need of polarity marking in polyphase AC circuits?

Description :

What is the need of polarity marking in polyphase AC circuits?

Answer :

Need of Polarity Marking in Polyphase AC Circuits: i) Polarity marking of terminals provides reference polarity for better understanding of system, even if the polarity of ac voltage changes ... of current transformers in relay protection circuit and getting desired performance is very difficult.

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99 views 1 answer

asked Mar 19, 2018 by anonymous

In MOSFET, the polarity of the inversion layers is the same as that of?

Description :

In MOSFET, the polarity of the inversion layers is the same as that of?

Answer :

In MOSFET, the polarity of the inversion layers is the same as that of majority carriers in the source.

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108 views 1 answer

asked Apr 30, 2020 by anonymous

Polarity Test of Transformer

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Polarity Test of Transformer

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280 views 2 answers

asked Jul 27, 2019 by anonymous

Why phasing out and polarity test is carried out on three phase transformer?

Description :

Why phasing out and polarity test is carried out on three phase transformer?

Answer :

The phasing out test is carried out to identify the windings (primary and secondary) of corresponding phase of the three phase transformer. The polarity test is carried out to identify the ... identical polarity of the primary and secondary windings of each phase of the three phase transformer.

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190 views 1 answer

asked Mar 25, 2018 by anonymous

To determine the polarity of the voltage drop across a resistor, it is necessary to know?

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To determine the polarity of the voltage drop across a resistor, it is necessary to know?

Answer :

To determine the polarity of the voltage drop across a resistor, it is necessary to know direction of current through the resistor.

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324 views 1 answer

asked Dec 9, 2017 by anonymous

Do Zener diodes have polarity?

Description :

Do Zener diodes have polarity?

Answer :

Yes, Zener diode have polarity Anode(+) and Cathode (-). And Zener Diode are connected into circuit with their cathode as positive terminal because they operate in reverse bias mode.

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99 views 2 answers

asked Mar 21, 2018 by anonymous

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

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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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82 views 1 answer

asked Aug 19, 2019 by anonymous

Why are generators rated in kVA not in kW ?

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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.

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101 views 3 answers

asked May 3, 2018 by anonymous

Two synchronous generators G1, G2 are operating in parallel and are equally sharing KVAR (Lag) component

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

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290 views 1 answer

asked Apr 28, 2018 by anonymous

Two synchronous generators operating in parallel supply a common load of 2.5 MW. The frequency-power

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

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87 views 1 answer

asked Mar 20, 2018 by anonymous

Large capacity generators are invariably?

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Answer :

Large capacity generators are invariably hydrogen cooled.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

Generators for peak load plants are usually designed for maximum efficiency at?

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Answer :

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

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90 views 1 answer

asked Apr 29, 2018 by anonymous

In a dc machine, interpoles are used to

Description :

In a dc machine, interpoles are used to (1) neutralize the effect of armature reaction in the interpolar region (2) generate more induced emf in the armature (3) avoid interference of the armature flux with the main -field flux (4) reduce the demagnetizing effect of armature reaction

Answer :

In a dc machine, interpoles are used to neutralize the effect of armature reaction in the interpolar region

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89 views 1 answer

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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221 views 1 answer

asked Mar 21, 2018 by anonymous

In a level compounded D.C. generator, full load terminal voltage is?

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Answer :

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

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91 views 1 answer

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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171 views 1 answer

asked Mar 21, 2018 by anonymous

In a D.C. machine stray loss is the sum of?

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Answer :

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

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111 views 1 answer

asked Mar 21, 2018 by anonymous

To avoid formation of grooves in the commutator of a D.C. machine?

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Answer :

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

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2.9k views 1 answer

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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96 views 1 answer

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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155 views 1 answer

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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384 views 1 answer

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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626 views 1 answer

asked Mar 20, 2018 by anonymous

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

Description :

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81 views 0 answers

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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139 views 1 answer

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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130 views 1 answer

asked Mar 20, 2018 by anonymous

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

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Answer :

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

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81 views 1 answer

asked Mar 20, 2018 by anonymous

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

Description :

Answer :

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

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412 views 1 answer

asked Mar 20, 2018 by anonymous

In a D.C. machine, short-circuited field coil will result in?

Description :

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asked Mar 20, 2018 by anonymous

Eddy currents are induced in the pole shoes of a D.C. machine due to?

Description :

Answer :

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

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154 views 1 answer

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?

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.

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