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. |
What is the formula for the voltage across each field coil? |
| A. | voltage across each field coil = (0.8-0.85)*exciter voltage/number of poles |
| B. | voltage across each field coil = (0.8-0.85)*exciter voltage*number of poles |
| C. | voltage across each field coil = (0.8-0.85)/exciter voltage*number of poles |
| D. | voltage across each field coil = (0.8-0.85)/exciter voltage/number of poles |
| Answer» B. voltage across each field coil = (0.8-0.85)*exciter voltage*number of poles | |
| 2. |
The field winding should be designed for a voltage from 15-20% less than the exciter voltage. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 3. |
What is the range of the exciter voltage in the field coils? |
| A. | 50-100 V |
| B. | 150-300 V |
| C. | 200-400 V |
| D. | 50-400 V |
| Answer» E. | |
| 4. |
What is the range of the pressure under which the field coils are consolidated? |
| A. | 4-10 MN per m2 |
| B. | 3-10 MN per m2 |
| C. | 4-12 MN per m2 |
| D. | 4-15 MN per m2 |
| Answer» D. 4-15 MN per m2 | |
| 5. |
What is the lamination material of the pole body and the thickness of the pole body insulation? |
| A. | epoxy resin, 5 mm thick |
| B. | epoxy resin. 4 mm thick |
| C. | asbestos, 4 mm thick |
| D. | asbestos 5 mm thick |
| Answer» C. asbestos, 4 mm thick | |
| 6. |
What is the thickness of the layers of Class F insulation and what material is layers made of? |
| A. | 0.18 mm, asbestos paper |
| B. | 0.10 mm, asbestos paper |
| C. | 0.18 mm, thick epoxy treated asbestos paper |
| D. | 0.10 mm, thick epoxy treated asbestos paper |
| Answer» D. 0.10 mm, thick epoxy treated asbestos paper | |
| 7. |
How many layers does the machine with Class F insulation consists of? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 8. |
During the pressing and consolidation by how much is the thickness of the interturn insulation reduced to? |
| A. | 0.36 mm to 0.26 mm |
| B. | 0.36 mm to 0.25 mm |
| C. | 0.30 mm to 0.25 mm |
| D. | 0.32 mm to 0.25 mm |
| Answer» B. 0.36 mm to 0.25 mm | |
| 9. |
Current is passed simultaneously through the conductors to raise the temperature of the field coil. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 10. |
What is the thickness of the flanges and what material is used in the flanges? |
| A. | 10 mm thick, resins |
| B. | 10 mm thick, asbestos |
| C. | 15 mm thick, asbestos |
| D. | 10 mm thick, bakelized asbestos |
| Answer» E. | |
| 11. |
What material is the paper strips stuck with? |
| A. | synthetic resin varnish |
| B. | shellac |
| C. | synthetic resin varnish and shellac |
| D. | synthetic resin varnish or shellac |
| Answer» E. | |
| 12. |
For machines with Class B insulation, how many layers of inter turn insulation is made use of and what is the distance between the layers? |
| A. | 4, 0.18 mm |
| B. | 3, 0.25 mm |
| C. | 2, 018 mm |
| D. | 2, 0.25 mm |
| Answer» D. 2, 0.25 mm | |
| 13. |
What should be the maximum width of the edge conductors used in the large alternators? |
| A. | 6 mm |
| B. | 5 mm |
| C. | 4 mm |
| D. | 3 mm |
| Answer» B. 5 mm | |
| 14. |
What type of strips is made use of for field coils of small alternators? |
| A. | wood covered rectangular strips |
| B. | bare copper strips |
| C. | glass covered rectangular strips |
| D. | iron strips |
| Answer» D. iron strips | |
| 15. |
What type of coils are made use of for machines with small number of poles? |
| A. | iron wound coils |
| B. | wire wound coils |
| C. | rectangular coils |
| D. | square coils |
| Answer» C. rectangular coils | |