A. reduces generator e.m.f.
B. increases armature speed
C. reduces interpoles flux density
D. results in sparking trouble
Correct Answer: reduces generator e.m.f. ✔
Last Updated: July 05, 2018
Related MCQs
- 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__________?
- 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__________?
- The insulating material used between the commutator segments is normally__________?
- The material for commutator brushes is generally__________?
- In case of a 4-pole D.C. generator provided with a two layer lap winding with sixteen coils, the pole pitch will be__________?
- 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
- The field coils of D.C. generator are usually made of__________?
- In a commutator__________?
- According to Fleming’s right-hand rule for finding the direction of induced e.m.f., when middle finger points in the direction of induced e.m.f., forefinger will point in the direction of__________?
- 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__________?
- 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__________ ?
- In D.C. generators, the cause of rapid brush wear may be__________?
- The bearings used to support the rotor shafts are generally__________?
- In lap winding, the number of brushes is always__________?
- In a four-pole D.C. machine__________?
- A separately excited generator as compared to a self-excited generator__________?