MCQOPTIONS
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MCQOPTIONS
This section includes 3 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. |
Electromagnetic force and/or torque developed in any physical system, acts in such a direction as to tend to ____________ |
| A. | increase both the field energy and co-energy at constant current |
| B. | increase the field energy and decrease the co-energy at constant current |
| C. | decrease both the field energy and co-energy at constant current |
| D. | decrease the field energy and increase the co-energy at constant current |
| Answer» B. increase the field energy and decrease the co-energy at constant current | |
| 2. |
The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in such a direction as to tend to ____________ |
| A. | decrease both the reluctance and inductance |
| B. | increase both the reluctance and inductance |
| C. | decrease the reluctance and increase the inductance |
| D. | increase the reluctance and decrease the inductance |
| Answer» D. increase the reluctance and decrease the inductance | |
| 3. |
Consider a magnetic relay with linear magnetization curve in both of its open and closed position. What happens to the electrical energy input to the relay, when the armature moves slowly from open position to closed position? |
| A. | W<sub>elec</sub>=W<sub>fld</sub> |
| B. | W<sub>elec</sub>=W<sub>mech</sub> |
| C. | W<sub>elec</sub>=W<sub>mech</sub>/2+W<sub>fld</sub>/2 |
| D. | W<sub>elec</sub>=0 |
| Answer» D. W<sub>elec</sub>=0 | |