A. 2
B. 4
C. 6
D. 8
Correct Answer: 4 ✔
Last Updated: July 05, 2018
Related MCQs
- In a D.C. generator:__________?
- In a D.C. generator the critical resistance can be increased by__________?
- Which generator would you prefer for feeding long D.C. transmission lines ?
- Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
- Armature reaction in a generator results in__________?
- If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be__________?
- The purpose of providing dummy coils in a generator is__________?
- A 220 V D.C. generator is run at full speed without any excitation. The open circuit voltage will be__________?
- 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__________?
- A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will__________?
- The purpose of providing dummy coils in a generator is__________?
- In D.C. generators on no-load, the air gap flux distribution in space is__________?
- The terminal voltage of a D.C. shunt generator drops on load because of all of the following reasons except:__________?
- In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except__________?
- 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 ?
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- 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?