Telephone Lines
Telephone Lines - The transmission lines used in telephony are of two kinds: open- wire and cable. The open-wire lines are gradually being superseded by cable construction, either overhead or underground, for two principal reasons. In the first place, many mo..
Telephone Lines
The transmission lines used in telephony are of two kinds: open- wire and cable. The open-wire lines are gradually being superseded by cable construction, either overhead or underground, for two principal reason..
Losses in Telephone Lines
The smallest conductor used in standard open-wire telephone circuits is No. 12B and S. gauge. A line of such construction will have a loss of approximately 0.06 db per mile. Cable circuits, on the other hand, make use of conductors not larger than No. 19, and a typical cable cir..
Telephone Circuits
Two-way operation is essential for satisfactory telephone service, and many of the problems of the industry arise from this fact. A simplified circuit for obtaining two-way operation is shown in the below figure. This is called a local-battery system because a separate battery is required..
Two-way operation is essential for satisfactory telephone service, and many of the problems of the industry arise from this fact. A simplified circuit for obtaining two-way operation is shown in the below figure. This is called a local-battery system because a separate battery is required..Telephone Circuits
Two-way operation is essential for satisfactory telephone service, and many of the problems of the industry arise from this fac..
Telephone Links
A microphone is a device that transforms sound pressure into electrical energy. In most types of microphone, the sound pressure acts upon a thin plate or diaphragm, setting it into vibration, and this mechanical motion is then utilised to produce electrical effect..
What fraction of telephones are colored green ?
What fraction of telephones are colored green ? => 1 2 or 1 4 or 3 8 or 3 9..
What fraction of telephones are colored green?
What fraction of telephones are colored green? => 1 4 or 4 9 or 3 8 or 1 2..
The selling price of a telephone is $36, which is 144% of the original..
The selling price of a telephone is $36, which is 144% of the original price. Find the original price of the telephone. => $25 or $26 or $27.60 or None of the above..
The installation charge of a telephone is $208, which is 73% of the to..
The installation charge of a telephone is $208, which is 73% of the total expenditure for a new telephone connection. Find the total expenditure. => $284.93 or $285.93 or $287.53 or None of the above..
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