Question 115Electricity & Electronics - 1st Asst/Chief
70% to passOn a modern silicon controlled rectified diesel-electric drive system, what are the characteristics of the main propulsion generators?
AThe generators are of the alternating current type running at constant frequency and delivering a constant voltage.
BThe generators are of the direct current type running at constant speed and delivering a constant voltage.
CThe generators are of the alternating current type running at variable frequency and delivering a variable voltage.
DThe generators are of the direct current type running at variable speed and delivering a variable voltage.
AI Explanation
The correct answer is A) The generators are of the alternating current type running at constant frequency and delivering a constant voltage. This is the correct answer because modern silicon controlled rectified diesel-electric drive systems utilize alternating current (AC) generators that run at a constant frequency (e.g. 60 Hz) and deliver a constant voltage. This is necessary to power the propulsion motors which are also AC and require a stable input to operate efficiently. The generators are not direct current (DC) types, nor do they run at variable frequency or deliver variable voltage, which would be the characteristics of the other answer options.
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