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The armature of D.C. generator is laminated to

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Why is the armature of DC generator laminated?
Description :

Why is the armature of DC generator laminated?

Answer :

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

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158 views 1 answer
asked Mar 3, 2018 by anonymous
The armature core of a D.C. generator is usually made of?
Description :

Answer :

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

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98 views 1 answer
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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86 views 1 answer
asked Mar 20, 2018 by anonymous
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2
Description :

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

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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84 views 1 answer
asked May 8, 2018 by anonymous
A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave?
Description :

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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149 views 1 answer
asked Mar 21, 2018 by anonymous
Armature reaction in a generator results in?
Description :

Answer :

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

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94 views 1 answer
asked Mar 21, 2018 by anonymous
For a D.C. generator when the number of poles and the number of armature conductors is fixed...
Description :

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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104 views 1 answer
asked Mar 20, 2018 by anonymous
Open circuited armature coil of a D.C. machine is?
Description :

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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142 views 1 answer
asked Mar 20, 2018 by anonymous
The armature reaction in a synchronous generator supplying leading power factor load is
Description :

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

Answer :

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

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62 views 1 answer
asked Apr 28, 2018 by anonymous
Why poles of dc machine are laminated?
Description :

Why poles of dc machine are laminated?

Answer :

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

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60 views 1 answer
asked Apr 27, 2020 by anonymous
In a D.C. generator the critical resistance refers to the resistance of?
Description :

Answer :

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

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103 views 1 answer
asked Mar 21, 2018 by anonymous
If a D.C. generator fails to build up the probable cause could not be?
Description :

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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83 views 1 answer
asked Mar 21, 2018 by anonymous
The e.m.f. generated in a D.C. generator is directly proportional to?
Description :

Answer :

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

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440 views 1 answer
asked Mar 21, 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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106 views 1 answer
asked Mar 20, 2018 by anonymous
The critical resistance of the D.C. generator is the resistance of?
Description :

Answer :

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

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420 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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232 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?
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.

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365 views 1 answer
asked Mar 21, 2018 by anonymous
In a level compounded D.C. generator, full load terminal voltage is?
Description :

Answer :

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

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94 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?
Description :

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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180 views 1 answer
asked Mar 21, 2018 by anonymous
A D.C. generator can be considered as?
Description :

Answer :

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

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65 views 1 answer
asked Mar 21, 2018 by anonymous
Flashing the field of D.C. generator means?
Description :

Answer :

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

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70 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?
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.

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173 views 1 answer
asked Mar 21, 2018 by anonymous
In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when?
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.

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653 views 1 answer
asked Mar 20, 2018 by anonymous
D.C. generator generally preferred for charging automobile batteries is?
Description :

Answer :

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

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207 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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82 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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143 views 1 answer
asked Mar 20, 2018 by anonymous
Magnetic field in a D.C. generator is produced by?
Description :

Answer :

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

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148 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?
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.

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156 views 1 answer
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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247 views 1 answer
asked Mar 20, 2018 by anonymous
The condition for maximum efficiency for a D.C. generator is?
Description :

Answer :

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

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178 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?
Description :

Answer :

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

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109 views 1 answer
asked Mar 20, 2018 by anonymous
The armature torque of the D.C. shunt motor is proportional to?
Description :

Answer :

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

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121 views 1 answer
asked Mar 20, 2018 by anonymous
The normal value of the armature resistance of a d.c. motor is?
Description :

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

Answer :

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

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898 views 1 answer
asked Mar 26, 2018 by anonymous
When the armature of a D.C. motor rotates, e.m.f. induced is
Description :

Answer :

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

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127 views 1 answer
asked Mar 20, 2018 by anonymous
The armature voltage control of D.C. motor provides?
Description :

Answer :

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

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56 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?
Description :

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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230 views 1 answer
asked Mar 20, 2018 by anonymous
In D.C. generators on no-load, the air gap flux distribution in space is?
Description :

Answer :

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

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85 views 1 answer
asked Mar 21, 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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196 views 1 answer
asked May 3, 2018 by anonymous
In dc machines, the armature windings are placed on the rotor because of the necessity for
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

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218 views 2 answers
asked May 1, 2018 by anonymous
The induced emf in the armature of a lap -wound four -pole dc machine having 100 armature conductors
Description :

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

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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241 views 1 answer
asked Apr 29, 2018 by anonymous
Aluminium is not used as winding wire for the armature of a dc machine because
Description :

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

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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545 views 1 answer
asked Apr 29, 2018 by anonymous
Armature control of DC motor
Description :

Armature control of DC motor

Answer :

Armature control of DC motor

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143 views 2 answers
asked Aug 9, 2017 by anonymous
In a separately excited generator supplying rated load the armature reaction?
Description :

Answer :

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

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104 views 1 answer
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...
Description :

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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426 views 1 answer
asked Mar 21, 2018 by anonymous
Armature reaction of an unsaturated D.C. machine is?
Description :

Answer :

Armature reaction of an unsaturated D.C. machine is crossmagnetising.

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314 views 1 answer
asked Mar 20, 2018 by anonymous
The fall in speed of a dc generator due to increase in load can be corrected by
Description :

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

Answer :

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

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178 views 2 answers
asked May 1, 2018 by anonymous
Laminated cores, in electrical machines, are used to reduce?
Description :

Laminated cores, in electrical machines, are used to reduce?

Answer :

Laminated cores, in electrical machines, are used to reduce eddy current loss.

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63 views 1 answer
asked Mar 25, 2018 by anonymous
In AC. circuits, laminated iron is invariably used in order to?
Description :

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

Answer :

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

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88 views 1 answer
asked Mar 25, 2018 by anonymous
Why does the core of a transformer need to be laminated?
Description :

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

Answer :

Transformer cores are laminated to reduce eddy current loss.

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87 views 1 answer
asked Mar 14, 2018 by anonymous
The commutator segments are connected to the armature conductors by means of?
Description :

Answer :

The commutator segments are connected to the armature conductors by means of copper lugs.

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136 views 1 answer
asked Mar 20, 2018 by anonymous
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