MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. tWhat will be the rating of auto transformer? |
| A. | 500 VA |
| B. | 550 VA |
| C. | 100 VA |
| D. | 110 VA |
| Answer» C. 100 VA | |
| 2. |
What are the modes in which power can be transferred in an autotransformer? |
| A. | Conduction |
| B. | Induction |
| C. | Conduction and Induction |
| D. | Cannot be said |
| Answer» D. Cannot be said | |
| 3. |
For an auto-transformation ratio tending to the unity value, saving of the conductor material will be ___________ |
| A. | Tend towards 90% or more |
| B. | Tend towards 0% |
| C. | Can’t say |
| D. | Wil remain fix |
| Answer» B. Tend towards 0% | |
| 4. |
Ratio of winding material needed for autotransformer to thr two winding transformer is ______ |
| A. | 1- V2/V1 |
| B. | 1- N2/N1 |
| C. | 1- V2/V1 and 1- N2/N1 |
| D. | 1- V1/V2 |
| Answer» D. 1- V1/V2 | |
| 5. |
An autotransformer compared to its two-winding counterpart has a higher operating efficiency. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6. |
RATIO_OF_WINDING_MATERIAL_NEEDED_FOR_AUTOTRANSFORMER_TO_THR_TWO_WINDING_TRANSFORMER_IS_______?$ |
| A. | 1- V<sub>2</sub>/V<sub>1</sub> |
| B. | 1- N<sub>2</sub>/N<sub>1</sub> |
| C. | 1- V<sub>2</sub>/V<sub>1</sub> and 1- N<sub>2</sub>/N<sub>1</sub> |
| D. | 1- V<sub>1</sub>/V<sub>2</sub> |
| Answer» D. 1- V<sub>1</sub>/V<sub>2</sub> | |
| 7. |
What are the modes in which power can be transferred in an autotransformer?$ |
| A. | Conduction |
| B. | Induction |
| C. | Conduction and Induction |
| D. | Cannot be said |
| Answer» D. Cannot be said | |
| 8. |
For_an_auto-transformation_ratio_tending_to_the_unity_value,_saving_of_the_conductor_material_will_be____________$ |
| A. | Tend towards 90% or more |
| B. | Tend towards 0% |
| C. | Can’t say |
| D. | Wil remain fix |
| Answer» B. Tend towards 0% | |
| 9. |
For a 20kVA transformer with turn ratio 0.4 what amount of total power is transferred conductively? |
| A. | 8kVA |
| B. | 12kVA |
| C. | 10kVA |
| D. | 50kVA |
| Answer» B. 12kVA | |
| 10. |
For a 20kVA transformer with turn ratio 0.4 what amount of total power is transferred inductively? |
| A. | 8kVA |
| B. | 12kVA |
| C. | 10kVA |
| D. | 50kVA |
| Answer» C. 10kVA | |
| 11. |
A_100/10,_50_VA_double_winding_transformer_is_converted_to_100/110_V_auto_transformer._tWhat_will_be_the_rating_of_auto_transformer? |
| A. | 500 VA |
| B. | 550 VA |
| C. | 100 VA |
| D. | 110 VA |
| Answer» C. 100 VA | |
| 12. |
An autotransformer compared to its two-winding counterpart has a higher operating efficiency? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 13. |
When auto-transformation ratio becomes equal to 1, which of the following statement is true? |
| A. | VA rating of the autotransformer becomes far greater than VA rating of two winding transformer |
| B. | VA rating of the autotransformer becomes far lower than VA rating of two winding transformer |
| C. | VA rating of the autotransformer becomes equal to VA rating of two winding transformer |
| D. | Can’t comment |
| Answer» B. VA rating of the autotransformer becomes far lower than VA rating of two winding transformer | |
| 14. |
Two-winding transformer of a given VA rating if connected as an autotransformer can handle ___________ |
| A. | Higher VA |
| B. | Lower VA |
| C. | Same VA |
| D. | Cannot be found |
| Answer» B. Lower VA | |
| 15. |
Which of the following is not true regarding the autotransformer compare to two-winding transformer? |
| A. | Lower reactance |
| B. | Lower losses |
| C. | Higher exciting current |
| D. | Better voltage regulation |
| Answer» D. Better voltage regulation | |
| 16. |
Autotransformers are particularly economical when _________ |
| A. | Voltage ratio is less than 2 |
| B. | Voltage ratio is very high |
| C. | Voltage ratio is higher than 2 in smaller range |
| D. | Can be used anywhere |
| Answer» B. Voltage ratio is very high | |
| 17. |
Total windings present in a autotransformer are __________ |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 18. |
Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is |
| A. | Approximately equal to one |
| B. | Less than one |
| C. | Great than one |
| D. | Cannot be found |
| Answer» B. Less than one | |
| 19. |
Which of the following is the main advantage of an auto-transformer over a two-winding transformer? |
| A. | Hysteresis losses are reduced |
| B. | Saving in winding material |
| C. | Copper losses are negligible |
| D. | Eddy losses are totally eliminated |
| Answer» C. Copper losses are negligible | |