MCQOPTIONS
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MCQOPTIONS
This section includes 7 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. |
In all rotating electrical machine, electrical torque is developed when relative speed between stator field and rotor field is ____________ |
| A. | zero |
| B. | equal to rotor speed |
| C. | equal and opposite to rotor speed |
| D. | dependent upon the type of electrical machine |
| Answer» B. equal to rotor speed | |
| 2. |
Load angle is the angle between ____________ |
| A. | stator MMF F<sub>s</sub> and resultant MMF F<sub>R</sub> |
| B. | stator MMF F<sub>s</sub> and rotor MMF F<sub>r</sub> |
| C. | rotor MMF F<sub>r</sub> and resultant MMF F<sub>R</sub> |
| D. | stator MMF F<sub>s</sub> and resultant MMF F<sub>R</sub> (or) rotor MMF F<sub>r</sub> and resultant MMF F<sub>R</sub> |
| Answer» E. | |
| 3. |
Torque angle is the angle between ____________ |
| A. | stator MMF F<sub>s</sub> and resultant MMF F<sub>R</sub> |
| B. | stator MMF F<sub>s</sub> and rotor MMF F<sub>r</sub> |
| C. | rotor MMF F<sub>r</sub> and resultant MMF F<sub>R</sub> |
| D. | any of the mentioned |
| Answer» C. rotor MMF F<sub>r</sub> and resultant MMF F<sub>R</sub> | |
| 4. |
In practice, electromagnetic torque acting on the stator _________ |
| A. | rotate in opposite direction to rotor |
| B. | is transmitted to ground |
| C. | makes it rotate in same direction as of rotor |
| D. | none of the mentioned |
| Answer» C. makes it rotate in same direction as of rotor | |
| 5. |
Which of the following statements are correct regarding the torque equation in non salient pole machines, Te = -(P/2)( o rl/g)(FsFr)sin Nm? |
| A. | stator experiences less torque than rotor and in opposite directions |
| B. | rotor experiences less torque than stator and in same directions |
| C. | stator and rotor experiences equal and opposite torques |
| D. | stator and rotor experiences equal torque and in same directions |
| Answer» D. stator and rotor experiences equal torque and in same directions | |
| 6. |
The torque equation for non salient pole machine is Te = -(P/2)( o rl/g)(FsFr)sin Nm. What does the negative sign in the torque expression indicates? |
| A. | stator and rotor MMF tend to reduce angle |
| B. | stator and rotor MMF tend to increase angle |
| C. | stator tend to reduce the air gap g |
| D. | rotor tend to reduce the air gap g |
| Answer» B. stator and rotor MMF tend to increase angle | |
| 7. |
The electromagnetic torque in non salient pole machines depends on _________ |
| A. | number of poles |
| B. | machine dimensions at the air gap |
| C. | peak value of stator and rotor MMF |
| D. | any of the mentioned |
| Answer» E. | |