MCQOPTIONS
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MCQOPTIONS
This section includes 11 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_A_4_POLE_MACHINE,_WHAT_IS_THE_FLUX_PER_POLE_PRODUCED,_IF_THE_ARMATURE_LENGTH_IS_L_AND_RADIUS_IS_R_AND_BP_IS_PEAK_VALUE_OF_SINUSOIDAL_FLUX??$ |
| A. | 4B<sub>p</sub>lr |
| B. | 2B<sub>p</sub>lr |
| C. | B<sub>p</sub>lr |
| D. | B<sub>p</sub>lr/2 |
| Answer» D. B<sub>p</sub>lr/2 | |
| 2. |
The equation for flux per pole Φ=4/PBplr, is valid for _____________$# |
| A. | for salient pole rotor only |
| B. | for cylindrical pole rotor only |
| C. | for both cylindrical and salient pole rotor |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 3. |
If Bp= peak value of sinusoidal flux density wave, L = armature core length, D = armature diameter, P = number of poles, the? |
| A. | flux per pole, Φ=2/PB<sub>p</sub>LD |
| B. | Average flux density, B<sub>av</sub>=2/πB<sub>p</sub> |
| C. | Φ=4/PB<sub>p</sub>LD |
| D. | B<sub>av</sub>=3/πB<sub>p</sub> |
| Answer» B. Average flux density, B<sub>av</sub>=2/‚âà√¨‚àö√ëB<sub>p</sub> | |
| 4. |
A chording angle ε is defined as the angle by which coil span departs from __________$ |
| A. | 90° electrical space degrees |
| B. | 180° electrical space degrees |
| C. | 360° electrical space degrees |
| D. | any of the mentioned |
| Answer» C. 360¬¨¬®‚Äö√†√ª electrical space degrees | |
| 5. |
In a full pitch coil, the two coil sides are how many electrical space degrees apart? |
| A. | 180 electrical degrees |
| B. | 90 electrical degrees |
| C. | 45 electrical degrees |
| D. | none of the mentioned |
| Answer» B. 90 electrical degrees | |
| 6. |
One turn consists of _____________ |
| A. | two coil sides |
| B. | two conductors |
| C. | four conductors |
| D. | four coil sides |
| Answer» C. four conductors | |
| 7. |
A coil consists of _____________ |
| A. | two conductors |
| B. | two coil sides |
| C. | two turns |
| D. | four turns |
| Answer» C. two turns | |
| 8. |
The part of the coil in which EMF is generated is known as _____________ |
| A. | end connection |
| B. | coil sides |
| C. | coil span |
| D. | none of the mentioned |
| Answer» C. coil span | |
| 9. |
A pole pitch in electrical machine _____________ |
| A. | = 180° electrical |
| B. | = 180° mechanical |
| C. | > 180° electrical |
| D. | < 180° electrical |
| Answer» B. = 180¬¨¬®‚Äö√†√ª mechanical | |
| 10. |
What is the relation between ‘ω’, angular speed in electrical radians per second and ‘ωm‘, angular speed in mechanical radians per second, for a P-pole machine?$ |
| A. | ω = 2/Pω<sub>m</sub> |
| B. | ω = 4/Pω<sub>m</sub> |
| C. | ω<sub>m</sub> = P/2ω |
| D. | ω = P/2ω<sub>m</sub> |
| Answer» E. | |
| 11. |
For a P-pole machine, the relation between electrical and mechanical degrees is given by _____________ |
| A. | θ<sub>elec</sub> = 2/P θ<sub>mech</sub> |
| B. | θ<sub>elec</sub> = 4/P θ<sub>mech</sub> |
| C. | θ<sub>mech</sub> = P/2 θ<sub>elec</sub> |
| D. | θ<sub>elec</sub> = P/2 θ<sub>mech</sub> |
| Answer» E. | |