A. 2 : 3
B. 3 : 1
C. 3 : 2
D. 1 : 3
Correct Answer: 3 : 1 ✔
Last Updated: July 05, 2018
Related MCQs
- 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__________?
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- Equilizer rings are required in case armature is__________?
- Eddy currents are induced in the pole shoes of a D.C. machine due to__________?
- D.C. generators are connected to the busbars or disconnected from them only under the floating condition__________?
- Armature reaction of an unsaturated D.C. machine is__________?
- If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be__________?
- In D.C. generators, the brushes on commutator remain in contact with conductors which__________?
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- If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by__________?
- If a D.C. generator fails to build up the probable cause could not be__________?
- Brushes of D.C. machines are made of_________?
- In D.C. generators, current to the external circuit from armature is given through__________?
- Iron losses in a D.C. machine are independent of variations in__________?
- Iron losses in a D.C. machine are independent of variations in__________?
- The armature of D.C. generator is laminated to__________?
- Laminations of core are generally made of__________?
- Which of the following could be lamina-proximately the thickness of laminations of a D.C. machine ?
- The commutator segments are connected to the armature conductors by means of__________?
- The resistance of armature winding depends on
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- While applying Fleming’s right-hand rule to And the direction of induced e.m.f., the thumb points towards__________?
- In D.C. generators the pole shoes are fastened to the pole core by__________?
- Fleming’s right-hand rule regarding direction of induced e.m.f., correlates__________?
- In case of D.C. machines, mechanical losses are primary function of__________?
- Copper brushes in D.C. machine are used__________?