Volume 2 — REVIEW QUESTIONS

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 11—68

What are the advantages of a common-battery system?

When is the local battery to be preferred to the common-battery?

Enumerate the different kinds of line signals.

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

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

Describe a line lamp with relay.

What is a pilot lamp and what are its functions?

Sketch three different kinds of batteries applied to cord circuits.

What is a supervisory signal?

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

When will the supervisory signal become operative?

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

At what voltages do they operate?

What are visual signals?

Describe the mechanical signal of the Western Electric Company.

Give a short description of the general assembly of the parts of a simple common-battery switchboard.

What is a transfer switchboard?

Outline the limitations of a simple switchboard.

Describe and sketch a plug-ended transfer line.

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

Make diagram of an order-wire arrangement.

What are the limitations of the transfer system?

What are the fundamental features of the multiple switchboard?

What is a multiple jack?

What is an answering jack?

Make a diagram showing the principle of multiple switchboards.

What is the busy signal?

What determines the size of a multiple switchboard?

What is the use of the intermediate distributing frame?

Make diagram of the series magneto multiple switchboard and describe its operation.

What are the defects of this system?

Give a diagram of the branch terminal magneto multiple switchboard.

Give a diagram and a short description of the Monarch magneto multiple switchboard.

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 69—134

Sketch and describe the line circuit of the common-battery multiple switchboard of the Bell companies.

Make a diagram of the cord circuit of the Western Electric standard multiple common-battery switchboard.

Describe the busy test in this system.

What is the function of the order-wire circuits?

What is jumper wire?

Give a short description of the relay mounting in the standard No. 1 relay board of the Western Electric Company.

What is the ultimate capacity of the No. 1 Western Electric switchboard?

What is the capacity of the No. 10 Western Electric switchboard?

How does this switchboard No. 10 differ from No. 1?

Give a diagram of the two-wire line circuit of the Kellogg Company.

What is the capacity of the condenser of the cord circuit in the foregoing system?

Give a complete diagram of the Kellogg two-wire board.

Describe the busy test in this system.

Give diagram of the Stromberg-Carlson multiple-board circuit.

What is the most important piece of apparatus in a multiple switchboard?

What is the spacing of the multiple jacks in the No. 1 Western Electric switchboard?

How do the relays of the Western Electric Company differ from those of other companies?

Describe the relay construction of the Monarch Telephone Company.

What is meant by inter-office trunking?

What is the present practice in America as to the capacity of multiple hoards?

What is the tendency in Europe regarding the capacity of multiple boards?

Discuss the preferences in American practice.

State the different methods of trunking between exchanges.

When are two-way trunks employed?

Make diagram of the Western Electric inter-office connection system.

Describe the standard four-party line trunk ringing key of the Western Electric Company.

Sketch and describe a keyless trunk.

Give diagram of the inter-office connection of the Kellogg system.

How does this system differ from the Western Electric in regard to the ringing?

Why are the A and B switchboards in large exchanges entirely separated?

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 135—226

What is the general object of automatic telephone systems?

What are the common arguments against these systems and how are they met?

Give the operations that the calling subscriber has to go through in any one of the successful systems.

During calling what is happening at the central office?

Describe the action of the Strowger or Automatic Electric Company selecting switch.

What is the function of a line switch?

Describe the Strowger scheme of trunking and illustrate its action by diagram.

Make a diagram of the sub-station apparatus and connections.

Make a diagram of the line switch unit.

Describe the action of the various guarding features necessary to protect a busy line.

Make a simple diagram of the circuits of the first selector.

Give the functions and operations of the connector.

Give a diagram of connecting circuits.

Tell all you can regarding the battery supply to the connected subscriber.

How are subscribers disconnected after they are through talking?

Describe a multi-office system.

Give a diagram of circuits of the trunk repeater.

Make a complete diagram of the connections between a calling and a called subscriber in an automatic system.

What is the rotary connector?

Describe the sub-station equipment of the Lorimer automatic system.

Describe the Lorimer central-office apparatus.

Give a description of the progress of a call from its institution to the final disconnection in the Lorimer system.

What is the automanual system?

Give general features of the operation in the automanual system.

Describe the automanual system subscribers' apparatus.

Give a description of the automanual central-office equipment.

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 227—270

What kinds of currents are employed?

What types of power plants are used?

Describe the sources of current supplied for the operator's transmitter current and ringing current.

Make a diagram of the Warner pole changer.

Make a diagram of pole changers for harmonic ringing.

What is a multi-cyclic generator set?

Make a diagram of governor for harmonic ringing generators.

Describe the various primary sources of power.

Make a diagram of the mercury-arc-rectifier circuits.

What provision against breakdown is made?

Tell all you can about the storage battery—its construction and its operation.

What is a pilot cell?

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

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

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

What provision should be made for cable runways?

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

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

Give principal points regarding small office terminal apparatus.

Give types of line circuits.

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

Give floor plan of an automatic office.

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 271—320

What is a private-branch exchange?

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

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

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

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

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

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

What is an intercommunicating system?

Sketch a magneto intercommunicating system.

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

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

Sketch and describe the Monarch intercommunicating system.

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

What is a long-distance message?

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

Which is the simplest form of long-distance switch?

What is a phantom circuit?

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

What is meant by ticket passing?

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

Give a typical load curve for telephone traffic.

Why is traffic a study of importance?

State the function of the intermediate distributing frame.

State the different methods of traffic study.

What is the trunking factor?

Define trunking efficiency.

Enumerate some of the elements upon which the quality of service in a manual system depends.

What is team work?

How does the cost of telephone service vary?

What two general methods of charging for telephone service are in use?

Describe a calculagraph and how is it used?

How are toll connections timed by the Monarch Telephone Company?

Sketch and describe the Western Electric Company line circuit and service meter.

REVIEW QUESTIONS ON THE SUBJECT OF TELEPHONY Pages 321—358

Describe a phantom circuit with diagram.

Explain how two phantoms may be joined by a physical circuit.

Which are the better, phantom or physical circuits, and why?

Explain how the simplex circuit differs from the phantom telephone circuit.

Why are not telegraph wires as serviceable for telephone work as telephone wires are for telegraph work?

Give the names of the different parts of a railway composite set and explain method of operating.

State the causes of the introduction of the telephone into the train dispatching field and explain the advantages it has over the telegraph for this work.

In transmitting orders for train dispatching, how are mistakes avoided?

Describe the Western Electric selector and explain its use.

In what way does the Gill selector differ from the Western Electric?

What special feature does the multiple coil selector possess?

What special arrangement is provided for the train dispatcher in noisy locations?

How can a man on a wrecking train get connection with the train dispatcher?

What is the usual limit in length of a telephone train dispatching circuit and what is the largest number of stations at present existing on such a circuit?

What is the voltage of the sending battery for a train dispatcher's circuit and upon what is it dependent?

For what purpose is a repeater circuit used?

How is the noise caused by a high voltage battery absorbed so that the dispatcher may talk and signal simultaneously?

Draw a diagram showing the circuit arrangement for the dispatcher's outfit of the Gill system.

Explain fully the purpose of the retardation coil in connection with a waystation set.

In case of accident to a train wire between two stations, how can the connection be patched if the road is also equipped with a message circuit in addition to the train wire?

Why do some railroads have block wires in addition to train wires and message circuits?

If a waystation on a block wire is to be cut out for any length of time, by what method can the two adjacent blocks be connected, eliminating the station between?

What are some of the methods used for dispatching on electric railways where the traffic is not especially heavy?

On an electric road in case a car approaches a semaphore set at "danger," what must the crew of the car do?

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