Exercise 2

Question 26 :

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 : 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.


Question 27 :

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 : 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.


Question 28 :

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 : Option B

Explanation :

A chip found in alomst every microprocessor...