hi everyone iam deepika and iam in btch 2nd year ece branch,as we are dealing with bee lab i want to know the lab viva questions with answers.
i hope u could provide with best materials.thankyou.
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bee lab viva questions with answers
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hi everyone iam deepika and iam in btch 2nd year ece branch,as we are dealing with bee lab i want to know the lab viva questions with answers.
i hope u could provide with best materials.thankyou.
18-09-2017, 03:19 PM
1. What is the need to start?
2. What is the basic protective device in any circuit?
3. Name the material used for the fuse.
4. Why is the ampere fuse rated?
5. What are the protection devices incorporated in the DC starters?
6. Why is the DC motor field rheostat kept in the minimum resistance position and the generator in the maximum resistance position?
7. Why is the DC motor armature rheostat held in the maximum resistance position?
8. Write the EMF equation for DC and the AC machine.
9. Write the torque equation of the DC motor.
10. Draw the sliding characteristics of the 3-phase induction motor and explain.
11. Explain the mechanical characteristics of the DC bypass motor using electrical characteristics and N / Ia characteristics.
12. How are ammeters and voltmeters connected in any circuit?
13. What is the difference between the MI and MC instruments?
14. How are MI meters used to measure AC and DC quantities?
15. Name the different types of DC and AC starters.
16. What is emf back? Give their meaning.
17. What is the difference between excited and excited machines separately?
18. Name the types of DC-powered machine.
19. Give the applications of each type of DC motor and DC generator.
20. What are the losses in the DC machine?
21. How is the loss of eddy current in the DC machine minimized?
22. Name the parts of the DC machine.
23. What is the use of the switch and the brushes?
24. Name the material used for the armature and core of the DC machine.
25. Why is the armature resistance less than the field resistance of the direct current tapping machine?
26. Why is the armature resistance greater than the field strength of the cc-series machine?
27. Why is the series engine the most suitable for traction applications?
28. Why should I not start the engine of the DC series without load?
29. Define the transformer.
30. What is the secondary frequency of the transformer?
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