Electrician _TT- 2nd year (KITI MOCK)By pulak.univ / February 1, 2024 Try to repeatedly answer the questions till you get the CORRECT answers LET'S CONTINUE 1. None 2. In which type of d.c. machine-poles is residual magnetism necessary ? Shunt generator ( Motor Separately excited generator Permanent magnet type generator None 3. Armature cores are commonly made of iron silicon steel high carbon steel stainless steel None 4. Lap winding has parallel paths. two four equal to the no. of poles one None 5. How interpoles are connected in a DC generator? In series with armature In parallel with armature In series with shunt field In parallel with shunt field None 6. In d.c. generator, which loss varies with the load? copper loss eddy current loss hysteresis loss windage loss None 7. The armature of d.c. generator is laminated to reduce the overall mass insulate core reduce the eddy current loss all the above None 8. In d.c. generators, lap winding is used for low voltage, low current ) high voltage, high current low voltage, high current high voltage, low current None 9. D. C. generator preferred for charging automobiles batteries is shunt generator series generator long shunt compound generator short shunt compound generator None 10. . The overall efficiency of a d.c. generator lies in the range of: 60-80% 80-90% 75-85% 85-95% None 11. For parallel operation the D.C. generators normally preferred are Shunt and over compound adjust speeds of their prime movers use equalizer connections. None 12. In the fleming's left hand rule the thumb represents the direction of motion of the conductor the direction of flux the direction of current flow in the conductor the voltage in the conductor None 13. By which law, the direction of the induced e.m.f. will be identified? Faraday's first law of electromagnetic induction Faraday's second law of electromagnetic induction Lenz's law Fleming's left hand rule ( None 14. Fleming's right hand rule is to identify the direction of flux direction of rotation of a generator direction of current in a motor direction of induced e.m.f None 15. A DC generator works on the principle of faraday's law of electrolysis flemings left hand rule lenz law faradays law of electromagnatic induction None 16. . A 6 pole DC generator has wave wound armature. If the armature is rewound for lap, the induced EMF will be increased by 6 time decreased by 6 times increased by 3 times decreased by 3 times None 17. The Insulating materials used between the commutator segments of a DC generator will be paper fibre wood mica None 18. In a DC Generator, if the field circuit resistance is more than the field critical resistance, then the generator will build up maximum voltage generator will generate maximum voltage generator will not build up the voltage ) field coils will burn None 19. . Brush tension in a DC generator plays very important role in its performance. Excessive brush tension may... slow down the speed of the machine decrease the output voltage increase the output voltage overheat the commutator and wear out the surface None 20. The purpose of lamination between core is used in armature is to............ increase the induced e.m.f reduce the eddy current loss reduce the copper loss reduce the armature reaction effect None 21. The load characteristic of separated excited generator is between armature current and emf armature current and terminal voltage load current and terminal voltage field current and terminal voltage None 22. The purpose of the flexible copper pig tail mounted on the brush of the D.C. generator is............. ( to collect current from the commulator to facilitate collection of current from the armature conductors to convey the current from the brushes to the holder to prevent the brush from flying out under the centrifugal force None 23. Which type of D.C. generator is used for welding generator set? ( D.C. shunt generator D.C. series generator D.C. Differential compound generator D.C. cumulative compound generator None 24. How many parallel paths in simplex wave winding armature of the D.C. generator, which is having 8 poles? 2 4 6 8 None 25. A pulley of DC generator is found to have completed 2000 revolutions within 1.25 minutes. The speed of the DC generator in r.p.m. will be: 1200 r.p.m 1400 r.p.m 1600 r.p.m 2000 r.p.m None 26. 8. Which type of D.C. generator is called as constant voltage generator ? D.C. series generator D.C. shunt generator D.C. Long shunt compound generator D.C. short shunt compound generator None 27. The generators are designed to deliver full load current (,) and the fall of no-load voltage will be about.......... 5 to 8% 3 to 6% 4 to 7 % 2 to 5% None 28. The DC shunt generator is not building up voltage. The reason is field winding open residual magnetism available in the field poles generator running at the rated speed generator runs in the correct direction None 29. The differential compound D.C. generator could be changed to an over compounded generator by changing the connection of the series and shunt field series and armature fields armature series field None 1 out of 3 Name Phone Your quiz is running out of time! few seconds are remaining. Time's upTime is Up!
