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

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asked Mar 20, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

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

Last 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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asked Mar 20, 2018 by anonymous

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

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

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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?

Last 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?

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

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101 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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69 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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104 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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77 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?

Last 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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127 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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159 views 1 answer

asked Apr 30, 2018 by anonymous

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

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

Last 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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83 views 1 answer

asked Mar 3, 2018 by anonymous

In DC generators lamination core are generally made of?

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

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130 views 1 answer

asked Mar 21, 2018 by anonymous

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

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

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76 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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86 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

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

Last 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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82 views 1 answer

asked Aug 19, 2019 by anonymous

Why are generators rated in kVA not in kW ?

Last 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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94 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

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

Last 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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257 views 1 answer

asked Mar 20, 2018 by anonymous

Large capacity generators are invariably?

Last answer: Large capacity generators are invariably hydrogen cooled.

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65 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last 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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138 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?

Last 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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96 views 1 answer

asked Mar 21, 2018 by anonymous

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

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

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73 views 1 answer

asked Mar 20, 2018 by anonymous

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be?

Last answer: Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be cumulatively compounded.

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293 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last 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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127 views 1 answer

asked Mar 20, 2018 by anonymous

Brushes of D.C. machines are made of?

Last answer: Brushes of D.C. machines are made of carbon.

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61 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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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?

Last 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?

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

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71 views 1 answer

asked Mar 21, 2018 by anonymous

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

Last 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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69 views 1 answer

asked Mar 21, 2018 by anonymous

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

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

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287 views 1 answer

asked Mar 20, 2018 by anonymous

The armature of D.C. generator is laminated to

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171 views 0 answers

asked Mar 20, 2018 by anonymous

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

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

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58 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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254 views 1 answer

asked May 25, 2018 by anonymous

If a self excited d.c. generator after being installed, fails to build up voltage on its first trial run, the first

If a self excited d.c. generator after being installed, fails to build up voltage on its first trial run, the first thing to do is (a) reverse the field winding connections (b) increase the field resistance (c) decrease the speed of prime mover (d) increase the speed of prime mover

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118 views 0 answers

asked Mar 20, 2018 by anonymous

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle...

D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the?

Last answer: D.C. motor is to a drive a load which is almost nil for certain part of the load cycle and peak value for short duration. We will select the compound motor.

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75 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value...

D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the?

Last answer: D.C. motor is to drive a load which has certain minimum value for most of the time and some peak value for short duration. We will select the series motor.

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206 views 1 answer

asked Mar 21, 2018 by anonymous

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

Last answer: The critical resistance of the D.C. generator is the resistance of field.

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133 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?

Last 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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183 views 1 answer

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?

Last 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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250 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?

Last 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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109 views 1 answer

asked Mar 21, 2018 by anonymous

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

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

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93 views 1 answer

asked Mar 21, 2018 by anonymous

Flashing the field of D.C. generator means?

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

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58 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?

Last 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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122 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?

Last 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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594 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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85 views 1 answer

asked Mar 20, 2018 by anonymous

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

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75 views 0 answers

asked Mar 20, 2018 by anonymous

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

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

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68 views 1 answer

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?

Last 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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112 views 1 answer

asked Mar 20, 2018 by anonymous

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

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. ?

Last answer: Wave winding

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80 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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239 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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145 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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95 views 1 answer

anonymous · Answer 1 · 2018-03-20T21:23:13+0000

answered Mar 20, 2018 by anonymous

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

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

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