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

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

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

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

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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?

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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 240 V.

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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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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?

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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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Description :

A cumulatively compounded d.c. generator is supplying 20 A at 200 V. If the series field winding is short circuited, the terminal voltage will (a) remain unaltered (b) rise to 220 V (c) shoot up to a very high value (d) become less than 200 V 

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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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The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is 0.5.

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

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For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

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For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

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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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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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A separately excited generator as compared to a self-excited generator is amenable to better voltage control, more stable, has exciting current independent of load current.

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Why does the speed of a DC shunt motor decrease as the load increases?

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Because if the load is increasing then the torque must also be increase. If not then the speed of motor will decrease.

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

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If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be?

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

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As the load is increased the speed of D.C. shunt motor will reduce slightly.

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The speed of a D.C. shunt motor can be increased by increasing the resistance in field circuit.

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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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The speed of a D.C. shunt motor more than its full-load speed can be obtained by decreasing the field current.

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if induction motor rotates exceed than its synchronous speed, it acts as a generator.

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

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

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An exciter for a turbo generator is a shunt generator.

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In a D.C. generator in case the resistance of the field winding is increased, then output voltage will decrease.

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

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

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

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

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

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

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

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

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A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be

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A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net Voltage across armature resistance at the time of plugging will be 474 V

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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

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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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If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

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In a manual shunt motor starter over load relay is connected in series and no volt relay in parallel with the load.

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If the speed of a D.C. shunt motor is increased, the back e.m.f. of the motor will increase.

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For a D.C. shunt motor if the excitation is changed torque will change but power will remain constant.

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In a D.C. shunt motor, speed is independent of armature current.

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If the field of a D.C. shunt motor gets opened while motor is running the motor will attain dangerously high speed.

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