Question 222Electricity & Electronics - 1st Asst/Chief

70% to pass

If the clock frequency input to the circuit shown in the illustration were 2 kHz, what would be indicated at the output of 'FF-3' at the Q3 output? Illustration EL-0087

Diagram for USCG Electrical Chief: If the clock frequency input to the circuit shown in the illustration were 2...
A125 Hz
B250 Hz
C500 Hz
D1000 Hz
AI Explanation

The correct answer is A) 125 Hz. In the circuit shown in the illustration EL-0087, the clock frequency input is 2 kHz. The circuit uses a series of flip-flops (FF-1, FF-2, FF-3) to divide the input frequency down. Each flip-flop divides the frequency by 2, so the output at the Q3 terminal of FF-3 will be 1/8th of the input frequency, which is 2 kHz / 8 = 250 Hz. The other options are incorrect because: B) 250 Hz is the output at the Q2 terminal of FF-2, not the Q3 terminal of FF-3; C) 500 Hz is the output at the Q1 terminal of FF-2, not the Q3 terminal of FF-3; and D) 1000 Hz is the output at the Q0 terminal of FF-1, not the Q3 terminal of FF-3.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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