MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How impedance of particular winding can be calculated? |
| A. | Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>+Z<sub>23</sub> |
| B. | Z<sub>1</sub>= 1/2¬Ω (Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub>) |
| C. | Z<sub>1</sub>= Z<sub>12</sub>-Z<sub>13</sub>+Z<sub>23</sub> |
| D. | Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub> |
| Answer» D. Z<sub>1</sub>= Z<sub>12</sub>+Z<sub>13</sub>-Z<sub>23</sub> | |
| 2. |
Simple phase equivalent circuit of three winding transformer can be shown as ____________ |
| A. | simple star network |
| B. | simple parallel network |
| C. | simple series network |
| D. | can be shown accordingly |
| Answer» B. simple parallel network | |
| 3. |
Which currents flow through the delta-connected tertiary winding? |
| A. | Positive sequence currents |
| B. | Negative sequence currents |
| C. | Zero sequence currents |
| D. | All sequence currents |
| Answer» D. All sequence currents | |
| 4. |
Any unbalanced load can be divided into _______________ |
| A. | positive and negative sequence components |
| B. | positive, negative and zero sequence components |
| C. | only in positive and zero sequence components |
| D. | only in negative and zero sequence components |
| Answer» C. only in positive and zero sequence components | |
| 5. |
Tertiary winding can be used for ____________ |
| A. | to maximize the core area |
| B. | to measure voltage during HV testing of transformer |
| C. | to fill up the space between primary and secondary windings |
| D. | to measure voltage during open circuit testing of transformer |
| Answer» C. to fill up the space between primary and secondary windings | |
| 6. |
Tertiary winding allows the flow of _______________ |
| A. | third harmonic currents |
| B. | fifth harmonic currents |
| C. | seventh harmonic currents |
| D. | eleventh harmonic currents |
| Answer» B. fifth harmonic currents | |
| 7. |
Tertiary winding is generally _________ |
| A. | star connected |
| B. | delta connected |
| C. | open-delta connected |
| D. | star or open-delta connected |
| Answer» C. open-delta connected | |
| 8. |
Why tertiary winding is used? |
| A. | To make circuit stable |
| B. | To provide voltage supply to the substations different from the primary and secondary voltage levels |
| C. | To connect static capacitors for reactive power injection |
| D. | Stable circuit, different voltage output, static capacitor connection |
| Answer» E. | |
| 9. |
Three winding and two winding transformers work on same working principle. |
| A. | True |
| B. | False |
| Answer» B. False | |