Why is the armature of DC generator laminated?

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asked Mar 3, 2018 by anonymous

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asked Mar 20, 2018 by anonymous

The armature of D.C. generator is laminated to

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asked May 8, 2018 by anonymous

A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2

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

Last 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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70 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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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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asked Apr 27, 2020 by anonymous

Why poles of dc machine are laminated?

Last answer: Poles of DC machines are laminated to reduce the eddy current losses in the poles.

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asked Apr 28, 2018 by anonymous

The armature reaction in a synchronous generator supplying leading power factor load is

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

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

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49 views 1 answer

asked Apr 29, 2018 by anonymous

Aluminium is not used as winding wire for the armature of a dc machine because

Aluminium is not used as winding wire for the armature of a dc machine because (1) aluminium has low resistivity (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

Last answer: Aluminium is not used as winding wire for the armature of a dc machine because (2) a large winding space is taken by aluminium conductors and creates jointing problems (3) the thermal conductivity of aluminium is low (4) aluminium has low conductivity as compared to copper

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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

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

Last 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 May 1, 2018 by anonymous

In dc machines, the armature windings are placed on the rotor because of the necessity for

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

Last answer: 3 Commutation

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190 views 2 answers

asked Apr 29, 2018 by anonymous

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors

The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is (1) 1000V (2) 100V (3) 600V (4) 10,000V

Last answer: The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors rotating at 600 rpm and with 1 Wb flux per pole is 1000V

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asked Aug 9, 2017 by anonymous

Armature control of DC motor

Last answer: Armature control of DC motor

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130 views 2 answers

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?

Last 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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131 views 1 answer

asked Mar 21, 2018 by anonymous

Armature reaction in a generator results in?

Last 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 15, 2018 by anonymous

What is the principle of DC generator?

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asked Mar 15, 2018 by anonymous

What is the difference between an AC and DC generator?

Last answer: The generator which generates DC voltage is called DC generator and generator which generates AC voltage is called AC generator (or) Alternator. In DC generator armature is rotated and field winding ... generator. A DC generator can generate low voltages but an AC generator can generate upto 11kv.

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asked May 1, 2018 by anonymous

The fall in speed of a dc generator due to increase in load can be corrected by

The fall in speed of a dc generator due to increase in load can be corrected by (1) cooling the armature.. (2) increasing the excitation. (3) reducing the load voltage. (4) increasing the input to the prime mover

Last answer: It can be corrected by increasing the input to the prime mover.

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159 views 2 answers

asked Apr 29, 2018 by anonymous

In a DC generator the windings of interpoles are connected :

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.

Last 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

From which material field coils of DC generator are made of?

Last answer: Field coils of DC generator are usually made of copper.

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asked Mar 20, 2018 by anonymous

The armature torque of the D.C. shunt motor is proportional to?

Last answer: The armature torque of the D.C. shunt motor is proportional to armature current.

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88 views 1 answer

asked Mar 20, 2018 by anonymous

The armature voltage control of D.C. motor provides?

Last answer: The armature voltage control of D.C. motor provides constant torque drive.

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51 views 1 answer

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?

Last 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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178 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 Apr 30, 2018 by anonymous

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density.

The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : (A) 256 W (B) 320 W (C) 500 W (D) 625 W

Last answer: The eddy current loss in a dc generator is 400 W at 40 Hz frequency of reversal and constant flux density. When frequency is increased to 50 Hz., eddy current loss is : 625 W

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79 views 1 answer

asked Apr 28, 2018 by anonymous

The terminal characteristics of a dc generator suitable for electric welders is

The terminal characteristics of a dc generator suitable for electric welders is (A) separately excited generator (B) shunt generator (C) series generator (D) differentially compounded generator

Last answer: The terminal characteristics of a dc generator suitable for electric welders is differentially compounded generator

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86 views 1 answer

asked Sep 30, 2017 by anonymous

why the Transformer core is laminated?

Last answer: Transformer core is laminated to reduce Eddy current losses.

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87 views 1 answer

asked Mar 14, 2018 by anonymous

Why does the core of a transformer need to be laminated?

Last answer: Transformer cores are laminated to reduce eddy current loss.

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74 views 1 answer

asked Jul 27, 2019 by anonymous

State the function of commutator in DC generator and name the material used for commutator.

Last answer: Function of Commutator: Commutator converts AC induced in armature winding into DC for external load. Material: i) Commutator segments are made up of Copper. ii) Commutator segments are insulated from each other by Mica.

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135 views 1 answer

asked Mar 26, 2018 by anonymous

The normal value of the armature resistance of a d.c. motor is?

Last answer: The normal value of the armature resistance of a d.c. motor is 0.5.

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773 views 1 answer

asked Mar 20, 2018 by anonymous

When the armature of a D.C. motor rotates, e.m.f. induced is

Last answer: When the armature of a D.C. motor rotates, e.m.f. induced is back e.m.f.

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101 views 1 answer

asked Mar 20, 2018 by anonymous

Open circuited armature coil of a D.C. machine is?

Last answer: Open circuited armature coil of a D.C. machine is identified by the scarring of the commutator segment to which open circuited coil is connected and indicated by a spark completely around the commutator.

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124 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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143 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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117 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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190 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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264 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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303 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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153 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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75 views 1 answer

asked Mar 20, 2018 by anonymous

D.C. generator generally preferred for charging automobile batteries is?

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

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177 views 1 answer

asked Mar 20, 2018 by anonymous

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

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

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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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73 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 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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597 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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122 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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97 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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asked Mar 25, 2018 by anonymous

In AC. circuits, laminated iron is invariably used in order to?

Last answer: In AC. circuits, laminated iron is invariably used in order to reduce eddy current loss.

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76 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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71 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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126 views 1 answer

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?

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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128 views 1 answer

anonymous · Answer 1 · 2018-03-03T01:39:27+0000

answered Mar 3, 2018 by anonymous

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

Why is the armature of DC generator laminated?

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