MCQOPTIONS
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MCQOPTIONS
This section includes 9 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_AN_INDUCTOR_MADE_FROM_MAGNETIC_CORE,_WITH_TWO_AIR_GAPS_OF_EQUAL_LENGTH_G,_EXCITING_COIL_WITH_1000_TURNS,_A=5CM‚ÄÖ√Ñ√∂‚ÀւĆ‚Àւ•5CM_AND_G=1CM,_WHAT_WILL_BE_THE_COIL_INDUCTANCE??$# |
| A. | 0.314H |
| B. | 0.157H |
| C. | 0.078H |
| D. | 0.628H |
| Answer» C. 0.078H | |
| 2. |
The voltage equation for the electrical system, in an electromechanical energy conversion device is as follows? |
| A. | ω<sub>r</sub> = (i)+(ii)+(iii) |
| B. | and (iii) terms represent respectively? |
| C. | transformer voltage term and speed/rotational voltage term |
| D. | speed/rotational voltage term and transformer voltage term |
| Answer» B. and (iii) terms represent respectively? | |
| 3. |
The final forms of the expression for generated EMF and torque,for AC and DC machines differ, because ____________ |
| A. | the fundamental principles underlying their operation are same |
| B. | the fundamental principles underlying their operation are different |
| C. | their construction details are same |
| D. | their construction details are different |
| Answer» E. | |
| 4. |
The basic torque and EMF expression of rotating electrical machines are ____________ |
| A. | applicable to DC machines only |
| B. | applicable to AC machines only |
| C. | applicable to both AC and DC machines |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 5. |
The interaction torque in a rotating electrical machine depends on which of the following components? |
| A. | sinδ |
| B. | cosδ |
| C. | torque angle δ |
| D. | stator field strength |
| Answer» B. cos‚âà√≠¬¨‚Ä¢ | |
| 6. |
Torque angle ‘δ’ is the angle between ____________$ |
| A. | rotor field axis and resultant field axis |
| B. | stator field axis and rotor field axis |
| C. | stator field axis and mutual field axis |
| D. | stator field axis and resultant field axis |
| Answer» C. stator field axis and mutual field axis | |
| 7. |
For the development of electromagnetic torque in a rotating electrical machine, the number of rotor poles must be ____________ |
| A. | greater than the stator poles |
| B. | less than the stator poles |
| C. | equal to the stator poles |
| D. | either greater or lesser than the stator poles |
| Answer» D. either greater or lesser than the stator poles | |
| 8. |
In a rotating electrical machine with 2 poles on the stator and 4 poles on the rotor, spaced equally, the net electromagnetic torque developed is ____________ |
| A. | maximum |
| B. | zero or no torque is developed |
| C. | minimum |
| D. | none of the mentioned |
| Answer» C. minimum | |
| 9. |
The magnitude of electromagnetic or interaction torque, in all rotating machines, is given by ____________ |
| A. | T<sub>e</sub> ∝(stator field strength)sinδ |
| B. | T<sub>e</sub> ∝(rotor field strength)sinδ |
| C. | T<sub>e</sub> ∝(stator field strength)(rotor field strength)sinδ |
| D. | T<sub>e</sub> ∝ sinδ |
| Answer» D. T<sub>e</sub> ‚Äö√Ñ√∂‚àö‚Ć‚àöœÄ sin‚âà√≠¬¨‚Ä¢ | |