MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For a 220-V level compound generator the terminal voltage at the half load is? |
| A. | more than 220-V |
| B. | same as no-load voltage |
| C. | more than no-load voltage |
| D. | lesser than no-load voltage |
| Answer» C. more than no-load voltage | |
| 2. |
Mark the correct order for the external characteristics of compound generators from the below graph. |
| A. | 1: over compound, 2: level compound, 3: under compound, 4: differential compound |
| B. | 1: under compound, 2: level compound, 3: over compound, 4: differential compound |
| C. | 1: differential compound, 2: level compound, 3: under compound, 4: over compound |
| D. | 1: over compound, 2: differential compound, 3: under compound, 4: level compound |
| Answer» B. 1: under compound, 2: level compound, 3: over compound, 4: differential compound | |
| 3. |
The voltage drop in terminal voltage from no-load to full load in a shunt generator can be compenated using _________ |
| A. | aiding series field |
| B. | long-shunt, diferential field |
| C. | aiding shunt field |
| D. | any of the measures |
| Answer» B. long-shunt, diferential field | |
| 4. |
Identify the machines by observing their external characteristics for (i) and (ii) respectively.(i) (ii) |
| A. | Separately excited dc generator, shunt generator |
| B. | Shunt generator, separately excited dc generator |
| C. | Differentially compound dc generator, separately excited |
| D. | Series dc generator, shunt generator |
| Answer» B. Shunt generator, separately excited dc generator | |
| 5. |
For a given dc generator, the external characteristic is plotted. Without using further plots, how can we obtain internal characteristic? |
| A. | By adding the IaRa drop to the plot |
| B. | By adding armature reaction |
| C. | By reducing IaRa drop |
| D. | All of the mentioned |
| Answer» B. By adding armature reaction | |
| 6. |
The air gap line represents _________ |
| A. | magnetic behaviour of the air gap of the dc machine |
| B. | magnetic behaviour of the air gap of the induction machine |
| C. | magnetic behaviour of the iron core |
| D. | all of the mentioned |
| Answer» B. magnetic behaviour of the air gap of the induction machine | |
| 7. |
Armature characteristic is also known as _________ |
| A. | regulation characteristic |
| B. | magnetization characteristic |
| C. | external characteristic |
| D. | load characteristic |
| Answer» B. magnetization characteristic | |
| 8. |
A student forgot to mark the x-y axes in his experiments but he just noted down the cause and the effect for each. How will he conclude about the armature characteristic out of the all plotted graphs? |
| A. | By marking graph for constant terminal voltage |
| B. | By marking graph for constant field current |
| C. | By marking graph for constant armature current |
| D. | By marking graph for constant speed |
| Answer» B. By marking graph for constant field current | |
| 9. |
The external characteristic is plotted between ____________ |
| A. | terminal voltage vs armature current at constant excitation |
| B. | terminal voltage vs field current at constant armature current |
| C. | induced armature emf vs armature current at constant excitation |
| D. | none of the mentioned |
| Answer» B. terminal voltage vs field current at constant armature current | |
| 10. |
THE_VOLTAGE_DROP_IN_TERMINAL_VOLTAGE_FROM_NO-LOAD_TO_FULL_LOAD_IN_A_SHUNT_GENERATOR_CAN_BE_COMPENATED_USING?$ |
| A. | aiding series field |
| B. | long-shunt, diferential field |
| C. | aiding shunt field |
| D. | any of the measures |
| Answer» B. long-shunt, diferential field | |
| 11. |
For a 220-V level compound generator the terminal voltage at the half load is |
| A. | more than 220-V |
| B. | same as no-load voltage |
| C. | more than no-load voltage |
| D. | lesser than no-load voltage |
| Answer» C. more than no-load voltage | |
| 12. |
What losses occur in the teeth of dc generator? |
| A. | To reduce hysteresis loss |
| B. | To reduce eddy current loss |
| C. | To reduce eddy current as well as hysteresis losses |
| D. | To achieve high permeability |
| Answer» D. To achieve high permeability | |
| 13. |
Why is armature of a dc machine made of silicon steel stampings? |
| A. | To reduce hysteresis loss |
| B. | To reduce eddy current loss |
| C. | For the ease with which slots can be created |
| D. | To achieve high permeability |
| Answer» B. To reduce eddy current loss | |
| 14. |
For a given dc generator, the external characteristic is plotted . Without using further plots, how can we obtain internal characteristic? |
| A. | By adding the IaRa drop to the plot |
| B. | By adding armature reaction |
| C. | By reducing IaRa drop |
| D. | All of the mentioned |
| Answer» B. By adding armature reaction | |
| 15. |
The air gap line represents |
| A. | magnetic behaviour of the air gap of the dc machine |
| B. | magnetic behaviour of the air gap of the induction machine |
| C. | magnetic behaviour of the iron core |
| D. | all of the mentioned |
| Answer» B. magnetic behaviour of the air gap of the induction machine | |
| 16. |
Armature characteristic is also known as |
| A. | regulation characteristic |
| B. | magnetization characteristic |
| C. | external characteristic |
| D. | load characteristic |
| Answer» B. magnetization characteristic | |
| 17. |
A student forgot to mark the x-y axes in his experiments but he just noted down the cause and the effect for each. How will he conclude about the armature |
| A. | |
| B. | By marking graph for constant terminal voltage |
| C. | By marking graph for constant field current |
| Answer» B. By marking graph for constant terminal voltage | |
| 18. |
The external characteristic is plotted between |
| A. | terminal voltage vs armature current at constant excitation |
| B. | terminal voltage vs field current at constant armature current |
| C. | induced armature emf vs armature current at constant excitation |
| D. | none of the mentioned |
| Answer» B. terminal voltage vs field current at constant armature current | |
| 19. |
Choose the most inappropriate out of the following for the no-load characteristics of the dc generator. |
| A. | It is the open circuit characteristic of the machine |
| B. | It is magnetization characteristic of the machine |
| C. | It is conducted on the unloaded machine |
| D. | None of the mentioned |
| Answer» E. | |
| 20. |
Which of the following characteristics reveal about the magnetization nature of the machine? |
| A. | No-load characteristics |
| B. | Load characteristics |
| C. | Armature characteristics |
| D. | Both no-load and load characteristics |
| Answer» E. | |