MCQOPTIONS
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MCQOPTIONS
This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Voltage at the neutral point oscillates at frequency of 2 , this phenomenon is called as _________ |
| A. | oscillating neutral |
| B. | doubling voltage |
| C. | doubling current |
| D. | doubling neutral |
| Answer» B. doubling voltage | |
| 2. |
Rate of change of voltage in star/star connection is ______________ |
| A. | |
| B. | 2 |
| C. | 3 |
| D. | Can t determine |
| Answer» C. 3 | |
| 3. |
In star/star connection the voltage can be correctly expressed as ____________ |
| A. | e<sub>aN</sub> = e<sub>a</sub> sin 2 t + e<sub>a3</sub> sin 3 t |
| B. | e<sub>aN</sub> = e<sub>a</sub> sin t + e<sub>a3</sub>sin 3 t |
| C. | e<sub>aN</sub> = e<sub>a</sub> sin 3 t + e<sub>a3</sub>sin 3 t |
| D. | e<sub>aN</sub> = e<sub>a</sub> sin 6 t + e<sub>a3</sub>sin 3 t |
| Answer» C. e<sub>aN</sub> = e<sub>a</sub> sin 3 t + e<sub>a3</sub>sin 3 t | |
| 4. |
Apart from connection which of the following is different in star/delta or delta/star compare to delta/delta? |
| A. | Flux is flat-topped |
| B. | Impedance offered to third-harmonic currents in delta is less |
| C. | Impedance offered to third-harmonic currents in delta is constant |
| D. | Impedance offered to third-harmonic currents in delta is more |
| Answer» E. | |
| 5. |
In delta/delta connection flux is almost _________________ |
| A. | sinusoidal |
| B. | flat-topped |
| C. | triangular |
| D. | square wave |
| Answer» B. flat-topped | |
| 6. |
Core flux in the transformer is _______________ |
| A. | sinusoidal |
| B. | flat-topped |
| C. | square wave |
| D. | triangular |
| Answer» C. square wave | |
| 7. |
For very high voltage transformers which connection is cheaper on primary side? |
| A. | Star |
| B. | Delta |
| C. | Open delta |
| D. | Can be star/ delta/ open delta |
| Answer» B. Delta | |