rage battery--its construction and its
operation.

12. What is a pilot cell?

13. Describe the switches, meters, and protective devices used on the
power switchboard.

14. Give a diagram showing a typical example of a common-battery manual
switchboard equipment and circuits.

15. Give the main points concerning the construction of a central-office
building.

16. What provision should be made for cable runways?

17. Make a sketch of a small central-office floor plan.

18. Describe the Western Electric main and intermediate frames. Give
diagrams.

19. Give principal points regarding small office terminal apparatus.

20. Give types of line circuits.

21. Describe the typical equipment of a large manual office. Give floor
plans.

22. Give floor plan of an automatic office.

REVIEW QUESTIONS

ON THE SUBJECT OF TELEPHONY

PAGES 271--320

* * * * *

1. What is a private-branch exchange?

2. What does "P. B. X." mean?

3. What is the function of the private-branch exchange operator?

4. Describe the key type of a small private-branch exchange switchboard.

5. Describe the different methods of supervision of private-branch
connections.

6. Describe the automatic equipment of the common-battery type in
private-branch exchanges.

7. How is secrecy of individual lines obtained in a private-exchange
equipment?

8. What is an intercommunicating system?

9. Sketch a magneto intercommunicating system.

10. Sketch and describe a plug type common-battery intercommunicating
system.

11. Sketch and describe the action of the push button in the Monarch
system and in the Western Electric system.

12. Sketch and describe the Monarch intercommunicating system.

13. What is the office of the junction box in this system?

14. What is a long-distance message?

15. What is the function of the repeating coil in the long-distance
line?

16. Which is the simplest form of long-distance switch?

17. What is a phantom circuit?

18. Under what control is the ringing of the subscriber in
long-distance calls?

19. What is meant by ticket passing?

20. What particular advantage has a common-battery set on long-distance
lines?

21. Give a typical load curve for telephone traffic.

22. Why is traffic a study of importance?

23. State the function of the intermediate distributing frame.

24. State the different methods of traffic study.

25. What is the trunking facto