online telephone books

Two-way operation is essential for satisfactory telephone service, and many of the problems of the industry arise from this fac..

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..

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 The open-wire lines are gradually being superseded by cable construction, either overhead or underground, for two principal reasons.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 more circuits can be accommodate..

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..

Microphones - 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 effects. The chief types ar..

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? => 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 price. Find the original price of the telephone. => $25 or $26 or $27.60 or None of the above..

The selling price of a telephone is $18, which is 36% of the original price. Find the original price of the telephone. => $50 or $51 or $52.6 or $53.5..

About 200,000 telephone calls are made in the United States on an average in a day. Estimate the number of telephone calls made per hour. => 8,383.33 or 8,433.33 or 8,233.33 or 8,333.33..