MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Transformers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following loss in a transformer is zero even at full load? |
| A. | Core loss |
| B. | Friction loss |
| C. | Eddy current loss |
| D. | Hysteresis loss |
| Answer» C. Eddy current loss | |
| 2. |
In a given transformer for a given applied voltage, which losses remain constant irrespective of load changes? |
| A. | Hysteresis and eddy current losses |
| B. | Friction and windage losses |
| C. | Copper losses |
| D. | Cannot be determined |
| Answer» B. Friction and windage losses | |
| 3. |
Losses which occur in rotating electric machines and do not occur in transformer are ______ |
| A. | Friction and windage losses |
| B. | Magnetic losses |
| C. | Hysteresis and eddy current losses |
| D. | Copper losses |
| Answer» B. Magnetic losses | |
| 4. |
How reduction in core losses and increase in permeability can be obtained simultaneously in a transformer? |
| A. | Core built-up of laminations of cold rolled grain oriented steel |
| B. | Core built-up of laminations of hot rolled sheet |
| C. | Cannot be determined |
| D. | Frequency Meter |
| Answer» B. Core built-up of laminations of hot rolled sheet | |
| 5. |
HOW_REDUCTION_IN_CORE_LOSSES_AND_INCREASE_IN_PERMEABILITY_CAN_BE_OBTAINED_SIMULTANEOUSLY_IN_A_TRANSFORMER??$ |
| A. | Core built-up of laminations of cold rolled grain oriented steel |
| B. | Core built-up of laminations of hot rolled sheet |
| C. | Cannot be determined |
| D. | Frequency Meter |
| Answer» B. Core built-up of laminations of hot rolled sheet | |
| 6. |
In a given transformer for a given applied voltage, which losses remain constant irrespective of load changes?$ |
| A. | Hysteresis and eddy current losses |
| B. | Friction and windage losses |
| C. | Copper losses |
| D. | Cannot be determined |
| Answer» B. Friction and windage losses | |
| 7. |
Losses_which_occur_in_rotating_electric_machines_and_do_not_occur_in_transformer_are_______$ |
| A. | Friction and windage losses |
| B. | Magnetic losses |
| C. | Hysteresis and eddy current losses |
| D. | Copper losses |
| Answer» B. Magnetic losses | |
| 8. |
A shell-type transformer has __________ |
| A. | High eddy current losses |
| B. | Reduced magnetic leakage |
| C. | Negligible hysteresis losses |
| D. | Cannot be determined |
| Answer» C. Negligible hysteresis losses | |
| 9. |
Which_of_the_following_loss_in_a_transformer_is_zero_even_at_full_load? |
| A. | Core loss |
| B. | Friction loss |
| C. | Eddy current loss |
| D. | Hysteresis loss |
| Answer» C. Eddy current loss | |
| 10. |
Which of the following can measure iron loss of a transformer? |
| A. | Low power factor wattmeter |
| B. | Unity power factor wattmeter |
| C. | Frequency meter |
| D. | Any type of wattmeter |
| Answer» B. Unity power factor wattmeter | |
| 11. |
If the supply frequency to the transformer is increased, the iron loss will ___________ |
| A. | Not change |
| B. | Decrease |
| C. | Increase |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |
| 12. |
Silicon steel used in laminations, because it reduces ________________ |
| A. | Hysteresis loss |
| B. | Eddy current losses |
| C. | Copper losses |
| D. | Cannot be determined |
| Answer» B. Eddy current losses | |
| 13. |
The full-load copper loss of a transformer is 1600 W. At half-load, the copper loss will be _______ |
| A. | 6400 W |
| B. | 1600 W |
| C. | 800 W |
| D. | 400 W |
| Answer» E. | |
| 14. |
Leakage flux in the transformer depends on _____________________ |
| A. | Load current |
| B. | Load current and voltage |
| C. | Load current, voltage and frequency |
| D. | Load current, voltage, frequency and power factor |
| Answer» B. Load current and voltage | |
| 15. |
Variations in a hysteresis loss in a transformer (Bmax = maximum flux density) ____________ |
| A. | Bmax |
| B. | Bmax<sup>1.6</sup> |
| C. | Bmax<sup>3.83</sup> |
| D. | Bmax/2 |
| Answer» C. Bmax<sup>3.83</sup> | |
| 16. |
On which of the following degree of mechanical vibrations produced by the laminations of a transformer depends? |
| A. | Tightness of clamping |
| B. | Gauge of laminations |
| C. | Size of laminations |
| D. | Tightness of clamping, gauge and size of laminations |
| Answer» E. | |
| 17. |
In a given transformer for given applied voltage, which of the following losses remain constant irrespective of load changes? |
| A. | Friction and windage losses |
| B. | Copper losses |
| C. | Hysteresis and eddy current losses |
| D. | Cannot be determined |
| Answer» D. Cannot be determined | |