Technology - Study Mode

[#151] Voltage is sometimes referred to as EMF, or Electromotive...?
Correct Answer

(D) Force

Explanation

Solution: The term EMF, or Electromotive Force, its use now in decline, is attributed to Italian physicist Alessandro Volta (1745-1827). Today we generally use the term "voltage" - can you guess why we call it that?

[#152] '.BAT' extension refers usually to what kind of file?
Correct Answer

(B) System file

[#153] What is the term to ask the computer to put information in order numerically or alphabetically?
Correct Answer

(D) Sort

[#154] The input used by an antenna or cable to a TV set uses frequencies called:
Correct Answer

(B) RF

Explanation

Solution: RF is radio frequency. IF is intermediate frequency used inside the TV for processing. AF is audio frequency. SAP is second audio program which may have another language or other soundtrack as an option to the main soundtrack.

[#155] Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?
Correct Answer

(A) Transformer

Explanation

Solution: The transformer is used to transform a medium voltage supply to a low voltage supply, e.g. from 11 000 V to 400 V. A transformer is rated in KVA, kilo-Volt-Amps, which is a measurement of electrical power.