Interfacing of LEDs - MCQs with answers

Interfacing of LEDs - MCQs with answers

1. What is/are the consequences of driving the LED in the form of an output function?

a. Pin sources the current when made low without glowing LED
b. Pin sinks the current when made high without glowing LED
c. Pin sources the current when made high by glowing LED
d. Pin sinks the current when made low by glowing LED

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2. What is the possible range of current limiting resistor essential for lightening the LED in certain applications after pressing the push-button?

a. 25- 55 Ω
b. 55-110 Ω
c. 110-220 Ω
d. 220- 330 Ω

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3. Which among the below given assertions exhibits the dependency of LED status over them, especially for LED and pushbutton connection?

a. Closure of pushbutton
b. Low Output pin driven by microcontroller
c. Both a & b
d. None of the above

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