In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?

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.

277 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.

483 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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asked Mar 21, 2018 by anonymous

A D.C. generator can be considered as?

Last Answer : A D.C. generator can be considered as rotating amplifier.

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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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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.

95 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.

128 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.

226 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.

600 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?

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.

785 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.

239 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

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.

224 views 1 answer

asked Mar 20, 2018 by anonymous

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

Last Answer : ni bondha

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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.

121 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.

148 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

141 views 1 answer

asked Mar 20, 2018 by anonymous

The armature of D.C. generator is laminated to

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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.

273 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.

237 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.

138 views 1 answer

asked Mar 20, 2018 by anonymous

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

From which material field coils of DC generator are made of?
Last Answer : Field coils of DC generator are usually made of copper.

118 views 1 answer

asked Mar 3, 2018 by anonymous

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and

A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively
Last Answer : A 36 slot, 4 -pole, dc machine has a simplex lap winding with two conductors per slot. The back pitch and front pitch adopted could be respectively 19,17

588 views 1 answer

asked May 3, 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.

144 views 1 answer

asked Mar 21, 2018 by anonymous

The purpose of providing dummy coils in a generator is?

The purpose of providing dummy coils in a generator is?
Last Answer : The purpose of providing dummy coils in a generator is to provide mechanical balance for the rotor.

312 views 1 answer

asked Mar 21, 2018 by anonymous

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

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.

256 views 1 answer

asked Jul 27, 2019 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

127 views 1 answer

asked May 8, 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.

355 views 2 answers

asked May 1, 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

103 views 1 answer

asked Apr 30, 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. ... 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.

122 views 1 answer

asked Apr 29, 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

105 views 1 answer

asked Apr 28, 2018 by anonymous

What is the difference between an AC and DC generator?

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.

315 views 1 answer

asked Mar 15, 2018 by anonymous

What is the principle of DC generator?

What is the principle of DC generator?
Last Answer : principle

80 views 1 answer

asked Mar 15, 2018 by anonymous

Why is the armature of DC generator laminated?

Why is the armature of DC generator laminated?
Last Answer : The armature of DC generator is laminated to reduce eddy current losses.

176 views 1 answer

asked Mar 3, 2018 by anonymous

In case of a flat compounded generator?

Last Answer : In case of a flat compounded generator voltage remains constant irrespective of the load.

103 views 1 answer

asked Mar 21, 2018 by anonymous

In the case of lap winding resultant pitch is?

Last Answer : In the case of lap winding resultant pitch is difference of front and back pitches.

122 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.

665 views 1 answer

asked Mar 20, 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.

216 views 1 answer

asked Mar 21, 2018 by anonymous

In a separately excited generator supplying rated load the armature reaction?

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

137 views 1 answer

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?

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.

177 views 1 answer

asked Mar 21, 2018 by anonymous

In over compounded generator, full load terminal voltage is?

Last Answer : In over compounded generator, full load terminal voltage is more than no load terminal voltage.

114 views 1 answer

asked Mar 21, 2018 by anonymous

An exciter for a turbo generator is a?

Last Answer : An exciter for a turbo generator is a shunt generator.

146 views 1 answer

asked Mar 21, 2018 by anonymous

A cumulatively compounded long shunt generator when operating as a motor would be?

Last Answer : A cumulatively compounded long shunt generator when operating as a motor would be differentially compounded long shunt.

111 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...

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?
Last 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.

668 views 1 answer

asked Mar 21, 2018 by anonymous

In a shunt generator the voltage build up is generally restricted by?

145 views 0 answers

asked Mar 21, 2018 by anonymous

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m...

A shunt generator running at 1000 r.p.m. has generated e.m.f. as 200 V. If the speed increases to 1200 r.p.m., the generated e.m.f. will be nearly?
Last Answer : 200V/E2 = 1000/1200 E2= 240 V

1.8k views 2 answers

asked Mar 21, 2018 by anonymous

Welding generator will have?

Last Answer : Welding generator will have lap winding.

81 views 1 answer

asked Mar 20, 2018 by anonymous

anonymous · Answer 1 · 2018-03-20T22:45:19+0000

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.

In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be?

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