61.

What does AM mean?
A. Angelo marconi B. Anno median
C. Amplitude modulation D. Amperes
Answer and Explanation
Answer:C
Explanation: Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.
62.

'.BAT' extension refers usually to what kind of file?
A. Compressed Archive file B. System file
C. Audio file D. Backup file
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
63.

What is the term to ask the computer to put information in order numerically or alphabetically?
A. Crop B. Report
C. Record D. Sort
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.
64.

The input used by an antenna or cable to a TV set uses frequencies called...?
A. IF B. RF
C. AF D. SAP
Answer and Explanation
Answer:B
Explanation: 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.
65.

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?
A. Transformer B. Transponder
C. Transducer D. Converter
Answer and Explanation
Answer:A
Explanation: 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.