22. Give diagram of the complete circuit of a simple magneto switchboard.
23. Sketch night-alarm circuit with relay.
24. What is a convertible cord circuit?
25. State what disadvantages may be encountered under certain conditions with a bridging drop-cord circuit.
26. Are lamps in cord circuits to be advocated on magneto switchboards?
27. What is the function of the cabinet?
28. Give cross-section of upright switchboard as used in the magneto system.
29. What is the purpose of a sectional switchboard?
30. Give a short description of the essential parts of a sectional switchboard.