Volume Ii Part 25 (2/2)

3. Enumerate the different kinds of line signals.

4. Make a diagram of the arrangement of a direct line lamp signal.

5. What is a direct line lamp with ballast? Give sketch.

6. Describe a line lamp with relay.

7. What is a pilot lamp and what are its functions?

8. Sketch three different kinds of batteries applied to cord circuits.

9. What is a supervisory signal?

10. Make diagram of a complete simple common-battery switchboard circuit.

11. When will the supervisory signal become operative?

12. What is the candle-power of incandescent lamps used for line and supervisory signals?

13. At what voltages do they operate?

14. What are visual signals?

15. Describe the mechanical signal of the Western Electric Company.

16. Give a short description of the general a.s.sembly of the parts of a simple common-battery switchboard.

17. What is a transfer switchboard?

18. Outline the limitations of a simple switchboard.

19. Describe and sketch a plug-ended transfer line.

20. Why is the plug-seat switch not more widely adopted for use?

21. Make diagram of an order-wire arrangement.

22. What are the limitations of the transfer system?

23. What are the fundamental features of the multiple switchboard?

24. What is a multiple jack?

25. What is an answering jack?

26. Make a diagram showing the principle of multiple switchboards.

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