A. interpoles
B. dummy coils
C. compensating winding
D. shifting of axis of brushes
Correct Answer: dummy coils ✔
Last Updated: July 05, 2018
Related MCQs
- In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when__________?
- In a level compounded D.C. generator, full load terminal voltage is__________?
- The e.m.f. generated in a D.C. generator is directly proportional to__________?
- In D.C. generators the polarity of the interpoles__________?
- In over compounded generator, full load terminal voltage is__________?
- Permeance is the reciprocal of__________?
- Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?
- Which of the following generator will have negligible terminal voltage while running on no-load?
- In a D.C. generator the number of mechanical degrees and electrical degrees will be the same when__________?
- D.C. generator generally preferred for charging automobile batteries is__________?
- In case of a flat compounded generator:
- Interpole flux should be sufficient to__________?
- Following D.C. generator will be in a position to build up without any residual magnetism in the poles__________?
- An exciter for a turbo generator is a__________?
- D.C. series generator is used__________?
- In a D.C. generator in case the resistance of the field winding is increased, then output voltage will__________?
- For the parallel operation of two or more D.C. compound generators, we should ensure that__________?
- Open circuited armature coil of a D.C. machine is__________?
- Lap winding is composed of__________?
- Satisfactory commutation of D.C. machines requires__________?
- In a D.C. machine stray loss is the sum of__________?
- The armature core of a D.C. generator is usually made of__________?
- In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilized is called__________?
- The e.m.f. generated by a shunt wound D.C. generator isE. Now while pole flux remains constant, if the speed of the generator is doubled, the e.m.f. generated will be__________?
- A D.C. generator can be considered as__________?
- The voltage drop for which of the following types of brush can be expected to be least ?
- Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be__________?
- Number of tappings for each equalizer ring is equal to__________?
- In D.C. generators, lap winding is used for__________?
- In a D.C. generator the ripples in the direct e.m.f. generated are reduced by__________?
- The rapid wear of brushes takes place due to__________?
- Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
- Compensating windings are used in D.C. generators__________?
- The following constitute short-circuit in the armature winding.
- The number of brushes in a commutator depends on__________?
- Magnetic field in a D.C. generator is produced by__________?
- To avoid formation of grooves in the commutator of a D.C. machine?
- The demagnetising component of armature reaction in a D.C. generator__________?
- A cumulatively compounded long shunt generator when operating as a motor would be__________?
- Armature coil is short circuited by brushes when it lies__________?
- Which of the following statement about D.C. generators is false ?
- To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead so as to bring them?
- A D.C. welding generator has__________?
- In a D.C. generator the critical resistance refers to the resistance of__________?
- 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__________?
- In the case of lap winding resultant pitch is__________?
- The function of pole shoes in the case of D.C. machine is__________?
- Flashing the field of D.C. generator means:__________?
- For a D.C. machines laboratory following type of D.C. supply will be suitable__________?
- In case of D.C. machine winding, number of commutator segments is equal to__________?
- Welding generator will have__________?