Question 237Electricity & Electronics - QMED
70% to passThe component labeled 'CR1' in the circuit shown in the illustration serves what functional purpose? Illustration EL-0085
Ait rectifies the varying voltage from the collector of 'Q1'
Bit varies its anode/cathode polarity depending on 'RL' current
Cit acts as a low capacitive reactance to smooth ripple
Dit establishes a constant reference voltage for the base of 'Q1'
AI Explanation
The correct answer is D) it establishes a constant reference voltage for the base of 'Q1'. The component labeled 'CR1' in the circuit shown is likely a Zener diode, which is used to maintain a constant reference voltage for the base of transistor 'Q1'. This reference voltage is necessary to ensure proper biasing and operation of the transistor amplifier circuit. The other answer choices are incorrect because: A) a rectifier is not the function of a Zener diode, B) a Zener diode does not vary its polarity based on load current, and C) a Zener diode is not used to smooth ripple, but rather to establish a constant voltage reference.
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