1 Answer

Answer :

Number of tappings for each equilizer ring is equal to number of pole pairs.

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Description : The rotor impedance of a slip ring induction motor is (0.1 + j0.6)Ohm/ ph . The resistance/ph to be inserted into rotor to get maximum torque at starting should be

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Last Answer : The purpose of guard ring in transmission lines is to reduce the earth capacitance of the lowest unit.

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Last Answer : A switch tail ring counter is made by using a single D-FF. The resulting circuit is T-FF

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Last Answer : (b) secondary winding

Last Answer : In a transformer, the tappings are generally provided on low voltage side.

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Last Answer : A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is 384 V

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Last Answer : for the voltage built-up a self-excited D.C. generator, which of the following is not an essential condition.  1.there must be some residual flux  2.field winding mmf must aid the ... .total field circuit resistance must be less than t critical value  4.armature speed must be very high

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Last Answer : (D) Field weakening due to armature reaction and armature resistance drop

Last Answer : The critical resistance of the D.C. generator is the resistance of field.

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Description : 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.

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

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.

Description : 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.

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

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

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

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

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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Last Answer : In a D.C. machine stray loss is the sum of iron loss and mechanical loss.

Last Answer : In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called armature.

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

Last Answer : The rapid wear of brushes takes place due to abrasion from dust, excessive spring pressure, rough commutator bars, high mica insulation between com-mutation bars.

Last Answer : To avoid formation of grooves in the commutator of a D.C. machine the brushes of opposite polarity should track each other.

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

Last Answer : Armature coil is short circuited by brushes when it lies along neutral axis.

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

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

Last Answer : If a D.C. generator fails to build up the probable cause could not be field resistance less than the critical resistance.