MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 5 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 pitch factor, in rotating electrical machinery, is defined as the ratio of resultant EMF of a _________ |
| A. | full-pitched coil to that of a chorded coil |
| B. | full-pitched coil to the phase EMF |
| C. | chorded coil to the phase EMF |
| D. | chorded coil to that of a full-pitched coil |
| Answer» E. | |
| 2. |
If a stator has 48 slots, 6 poles and 3 phase with narrow spread winding, then the third harmonic belt factor is ____________ |
| A. | 0.9556 |
| B. | 0.6407 |
| C. | 0.1944 |
| D. | None of the mentioned |
| Answer» C. 0.1944 | |
| 3. |
The armature winding of a 2-pole, 3-phase alternator for each phase is distributed in a number of slots per phase. The RMS value of the voltage per phase is less than the RMS value of the voltage per coil multiplied by the number of coils in series because the _________ |
| A. | RMS value of the voltage in different coils of the phase is different |
| B. | equal RMS voltages in different coils of the phase has mutual phase difference |
| C. | maximum value of the induced voltage in different coils of the phase are different |
| D. | different coils of the phase pass through different saturated regions of the magnetic circuit |
| Answer» C. maximum value of the induced voltage in different coils of the phase are different | |
| 4. |
The belt factor is defined as the ratio of __________ |
| A. | arithmetic sum of coil EMF to the phasor sum of coil EMFs |
| B. | phasor sum of EMF per coil to the arithmetic sum of EMF per coil |
| C. | phasor sum of coil EMFs to the arithmetic sum of coil EMFs |
| D. | phasor sum of coil EMFs to per phase voltage |
| Answer» D. phasor sum of coil EMFs to per phase voltage | |
| 5. |
The angular slot pitch, is given by __________ |
| A. | = P/Total number of slots Elect radians |
| B. | = 180P/Total number of slots Elect degrees |
| C. | = 180/Slots per pole Elect degrees |
| D. | Any of the mentioned |
| Answer» E. | |