MCQOPTIONS
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MCQOPTIONS
This section includes 10 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. |
THE_MAIN_EXCITER_USED_IN_DC_EXCITATION_IS_________?$ |
| A. | field on stator |
| B. | armature on stator |
| C. | field on rotor |
| D. | field on poles |
| Answer» B. armature on stator | |
| 2. |
If_the_DC_excitation_is_suddenly_dropped_to_0_,the_three_phase_alternator__________$ |
| A. | runs as motor |
| B. | stops to zero speed in few seconds |
| C. | continues to run as motor but at lower speed |
| D. | no change in the operating conditions |
| Answer» B. stops to zero speed in few seconds | |
| 3. |
The brushless excitation and conventional DC excitation systems are comparable but one significant change is ______? |
| A. | pilot exciter is brushless permanent magnet motor |
| B. | three phase rectifier feeds directly to main exciter |
| C. | a three phase rectifier is fed by main exciter |
| D. | no direct rectification is provided to the pilot exciter |
| Answer» B. three phase rectifier feeds directly to main exciter | |
| 4. |
The excitation system and speed of alternator has _______ |
| A. | linear response |
| B. | exponential response |
| C. | rectangular hyperbola response |
| D. | circular response |
| Answer» B. exponential response | |
| 5. |
The static excitations mainly comprises of _______ |
| A. | brushless excitation system |
| B. | thyrister based excitation system |
| C. | synchronous motor excitation system |
| D. | brushless and thyristor based excitation system |
| Answer» C. synchronous motor excitation system | |
| 6. |
The main problems faced by conventional DC exciters are/is _______ |
| A. | cooling and maintainance |
| B. | wear and tear |
| C. | additional parasitic losses |
| D. | all of the mentioned |
| Answer» E. | |
| 7. |
The pilot exciter in dc exciters is ________ |
| A. | dc shunt generator feeding field winding of mains |
| B. | universal motor |
| C. | stepper motor feeding the field winding of mains |
| D. | any of the mentioned |
| Answer» B. universal motor | |
| 8. |
In large synchronous machine, field winding is placed on ______ and ac supply on ______ |
| A. | rotor, stator |
| B. | stator, rotor |
| C. | armature, slots |
| D. | pole shoes, stator |
| Answer» B. stator, rotor | |
| 9. |
Field winding of a dc machine |
| A. | always absorbs power |
| B. | absorbs real power at lagging load |
| C. | delivers power while behaving as generator |
| D. | always delivers power |
| Answer» B. absorbs real power at lagging load | |
| 10. |
A 3 phase synchronous machine is _________ excited machine. |
| A. | doubly |
| B. | single |
| C. | two stage |
| D. | feedback based |
| Answer» B. single | |