66.
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 & Explanation
Answer: Option 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.
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67.
What was the active medium used in the first working laser ever constructed?
A. A diamond block
B. Helium-neon gas
C. A ruby rod
D. Carbon dioxide gas
Answer & Explanation
Answer: Option C
Explanation:
Theodore Maiman built the first working laser using a ruby rod while working at Hughes Research Laboratories in Malibu, California. It lased for the first time on May 16, 1960.
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68.
What does EPROM stand for?
A. Electric Programmable Read Only Memory
B. Erasable Programmable Read Only Memory
C. Evaluable Philotic Random Optic Memory
D. Every Person Requires One Mind
Answer & Explanation
Answer: Option B
Explanation:
A chip found in alomst every microprocessor…