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

For a transformer, operating at constant load current, maximum efficiency will occur at?
Last Answer : For a transformer, operating at constant load current, maximum efficiency will occur at unity power factor.

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asked Mar 19, 2018 by anonymous

when will be the maximum efficiency of transformer?

Last Answer : Transformer efficiency is maximum when copper losses are equal to iron losses.

91 views 1 answer

asked Sep 30, 2017 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.

554 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?

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.

129 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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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.

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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

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.

258 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 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

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

State maximum power transfer theorem for DC circuit.

State maximum power transfer theorem for DC circuit.
Last Answer : Maximum power transfer theorem for DC circuit: The maximum power transfer theorem states that the source or a network transfers maximum power to load only when the load resistance is equal ... removed (disconnected) ii) All internal independent sources are replaced by their internal resistances.

110 views 1 answer

asked Sep 6, 2018 by anonymous

Which D.C. motor has got maximum self relieving property ?

Last Answer : Series motor has got maximum self relieving property.

193 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.

366 views 1 answer

asked Mar 20, 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

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

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

What is race around condition in JK flip flop and how it can be eliminated?

What is race around condition in JK flip flop and how it can be eliminated?
Last Answer : For the racing around to take place, it is necessary to have the enable input high along with J=K=1. As the enable input remains high for a long time in a JK latch, the problem of ... to zero. Hence the multiple toggling cannot take place. Thus the edge triggering avoids the race around condition.

313 views 1 answer

asked Jul 31, 2019 by anonymous

Explain working of n-p-n transistor in unbiased condition.

Explain working of n-p-n transistor in unbiased condition.
Last Answer : Construction of NPN transistor: For an unbiased transistor no external power supplies are connected to it. Base is sandwiched between collector & emitter terminal. It is thin & lightly doped ... providing external power supply to transistor & this process is known as Biasing.

366 views 1 answer

asked Sep 5, 2018 by anonymous

The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC

The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC network is that all poles and zeros should be
Last Answer : The necessary and sufficient condition for a rational function of, T(s) to be driving point impedance of an RC network is that all poles and zeros should be simple and and lie on the negative axis in the s -plane

221 views 1 answer

asked Apr 29, 2018 by anonymous

The condition for the validity under Ohm's law is that?

The condition for the validity under Ohm's law is that?
Last Answer : The condition for the validity under Ohm's law is that resistance must be uniform.

179 views 1 answer

asked Mar 25, 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

anonymous · Answer 1 · 2018-03-20T21:21:07+0000

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

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

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