MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Design Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The range of the ratio of the height of the window to the width of the window is 2-4. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 2. |
What is the formula for the height of the window? |
| A. | height of window = area of window * width of the window |
| B. | height of window = area of window + width of the window |
| C. | height of window = area of window – width of the window |
| D. | height of window = area of window / width of the window |
| Answer» E. | |
| 3. |
What is the formula for window area of the transformer? |
| A. | window area = output power * 2.22 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103 |
| B. | window area = output power / 2.22 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103 |
| C. | window area = output power / 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103 |
| D. | window area = output power * 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core*103 |
| Answer» C. window area = output power / 3.33 * frequency * magnetic field * window space factor * current density * area of cross section of the core *103 | |
| 4. |
What is the formula for the width of the window of the transformer? |
| A. | width of the window = distance between core centers + diameter of the circumscribing circle |
| B. | width of the window = distance between core centers – diameter of the circumscribing circle |
| C. | width of the window = distance between core centers * diameter of the circumscribing circle |
| D. | width of the window = distance between core centers / diameter of the circumscribing circle |
| Answer» C. width of the window = distance between core centers * diameter of the circumscribing circle | |
| 5. |
What is the formula for the diameter of the circumscribing circle of the transformer? |
| A. | diameter of the circumscribing circle = 2*square root of ratio of cross sectional area of the core to the space factor |
| B. | diameter of the circumscribing circle = 3*square root of ratio of cross sectional area of the core to the space factor |
| C. | diameter of the circumscribing circle = square root of ratio of cross sectional area of the core to the space factor |
| D. | diameter of the circumscribing circle = 4*square root of ratio of cross sectional area of the core to the space factor |
| Answer» D. diameter of the circumscribing circle = 4*square root of ratio of cross sectional area of the core to the space factor | |
| 6. |
What is the formula for the net cross sectional area of the core of the transformer? |
| A. | cross sectional area = voltage per turn * 4.44 * frequency * magnetic field |
| B. | cross sectional area = voltage per turn / 4.44 * frequency * magnetic field |
| C. | cross sectional area = voltage per turn * 4.44 / frequency * magnetic field |
| D. | cross sectional area = voltage per turn * 4.44 * frequency / magnetic field |
| Answer» C. cross sectional area = voltage per turn * 4.44 / frequency * magnetic field | |
| 7. |
What is the formula to calculate the voltage per turn of the transformer? |
| A. | voltage per turn = space factor * square root of output power |
| B. | voltage per turn = space factor / square root of output power |
| C. | voltage per turn = space factor / square root of output power |
| D. | voltage per turn = space factor * 2*square root of output power |
| Answer» B. voltage per turn = space factor / square root of output power | |
| 8. |
What is the height of the single phase shell type transformer? |
| A. | height = height of window + width of the largest stamping |
| B. | height = 2*height of window + width of the largest stamping |
| C. | height = height of window + 2* width of the largest stamping |
| D. | height = height of window – width of the largest stamping |
| Answer» D. height = height of window – width of the largest stamping | |
| 9. |
What is the formula for the width of the single phase shell type transformer? |
| A. | width = 2*Width of the window + width of the largest stamping |
| B. | width = Width of the window + 4*width of the largest stamping |
| C. | width = Width of the window + width of the largest stamping |
| D. | width = 2*Width of the window + 4*width of the largest stamping |
| Answer» E. | |
| 10. |
What is the formula for the width over one limb? |
| A. | width over one limb = outer diameter of hv winding |
| B. | width over one limb = 2*Diameter – outer diameter of hv winding |
| C. | width over one limb = 2*Diameter + outer diameter of hv winding |
| D. | width over one limb = Diameter + outer diameter of hv winding |
| Answer» B. width over one limb = 2*Diameter – outer diameter of hv winding | |
| 11. |
The formula for single phase core type and three phase core type diameter and height are same. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 12. |
What is the formula for the width over 2 limbs? |
| A. | width = Width of largest stamping + Diameter of the transformer |
| B. | width = Diameter + outer diameter of hv windings |
| C. | width = Diameter – outer diameter of hv windings |
| D. | width = outer diameter of hv windings |
| Answer» C. width = Diameter – outer diameter of hv windings | |
| 13. |
What is the formula for width of the single phase core type transformer? |
| A. | width = Width of largest stamping / Diameter of the transformer |
| B. | width = Width of largest stamping + Diameter of the transformer |
| C. | width = Width of largest stamping – Diameter of the transformer |
| D. | width = Width of largest stamping * Diameter of the transformer |
| Answer» C. width = Width of largest stamping – Diameter of the transformer | |
| 14. |
What is the formula for height of the single phase core type transformer? |
| A. | height = height of the window – height of the yoke |
| B. | height = height of the window + height of the yoke |
| C. | height = height of the window – (2*height of the yoke) |
| D. | height = height of the window + (2*height of the yok |
| E. | height = height of the window + (2*height of the yoke) |
| Answer» E. height = height of the window + (2*height of the yoke) | |
| 15. |
What is the formula for the diameter of the single phase core type transformer? |
| A. | D = diameter of circumscribing circle + Width of window |
| B. | D = diameter of circumscribing circle – Width of window |
| C. | D = diameter of circumscribing circle * Width of window |
| D. | D = diameter of circumscribing circle / Width of window |
| Answer» B. D = diameter of circumscribing circle – Width of window | |