MCQOPTIONS
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MCQOPTIONS
This section includes 11 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 shunt branch component Y0 is calculated? |
| A. | I0/V1 |
| B. | V1/I0 |
| C. | P0/V1<sup>2</sup> |
| D. | Cannot be determined |
| Answer» B. V1/I0 | |
| 2. |
Which of the following is the correct formula for Bm? |
| A. | Bm= (Yo2-Gi2)<sup>(1/2)</sup> |
| B. | Bm= (Yo2+Gi2)<sup>(1/2)</sup> |
| C. | Bm= (Yo2-Gi2)<sup>(2)</sup> |
| D. | Bm= (Yo2+Gi2)<sup>(1/2)</sup> |
| Answer» B. Bm= (Yo2+Gi2)<sup>(1/2)</sup> | |
| 3. |
2 KVA, 230 V, 50 Hz single phase transformer has an eddy current loss of 40 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be ___________ |
| A. | Equal to 40W |
| B. | Less than 40W |
| C. | More than 40W |
| D. | Zero watts |
| Answer» E. | |
| 4. |
The total core loss can be termed as ____________ |
| A. | Eddy current loss |
| B. | Hysteresis loss |
| C. | Copper loss |
| D. | Magnetic loss |
| Answer» E. | |
| 5. |
If the applied voltage of a transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will _____________ |
| A. | Changes to three times the original value |
| B. | Changes to 1.5 times the original value |
| C. | Changes to 0.5 times the original value |
| D. | Remains the same as the original value |
| Answer» B. Changes to 1.5 times the original value | |
| 6. |
Which of the following statements is/are correct statements? |
| A. | EMF per turn in LV winding is more than EMF per turn in LV winding |
| B. | EMF per turn in LV winding is less than EMF per turn in LV winding |
| C. | EMF per turn in HV winding is equal to EMF per turn in LV winding |
| D. | Can t comment |
| Answer» D. Can t comment | |
| 7. |
How shunt branch component Gi is calculated? |
| A. | Po/v1<sup>2</sup> |
| B. | V1/Io |
| C. | Io/ V<sup>2</sup> |
| D. | Any of the above |
| Answer» B. V1/Io | |
| 8. |
In OC test all the power supplied is utilised for ______ |
| A. | Core losses |
| B. | Iron losses |
| C. | Windage losses |
| D. | Cannot be determined |
| Answer» C. Windage losses | |
| 9. |
Why OC test is performed on LV side? |
| A. | Simple construction |
| B. | Less voltage is required and parameters can be transformed to HV side |
| C. | It ll not give losses ig conducted on HV side |
| D. | HV side does not have connections for voltage |
| Answer» C. It ll not give losses ig conducted on HV side | |
| 10. |
Open circuit test on transformers is conducted so as to get ______________ |
| A. | Hysteresis losses |
| B. | Copper losses |
| C. | Core losses |
| D. | Eddy current losses |
| Answer» D. Eddy current losses | |
| 11. |
During open circuit test (OC) of a transformer _____________ |
| A. | primary is supplied rated kVA |
| B. | primary is supplied full-load current |
| C. | primary is supplied current at reduced voltage |
| D. | primary is supplied rated voltage |
| Answer» E. | |