Interfacing Electromechanical Relay with Microcontroller - MCQs with answers

Interfacing Electromechanical Relay with Microcontroller - MCQs with answers

1. In an electromechanical relay, the necessity of connecting an external base resistance arises only _________

a. in the presence of an internal pull-up resistor
b. in the absence of an internal pull-up resistor
c. in the absence of an internal push-up resistor
d. in the presence of an internal push-up resistor

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2. Which diodes are employed in the electromechanical relays since the inductor current cannot be reduced to zero?

a. Tunnel Diode
b. Shockley Diode
c. Freewheeling Diode
d. Zener Diode

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3. Where do the power gets dissipated during the gradual decay of an inductor current (upto zero value) by turning OFF the transistor in an electromechanical relay?

a. Internal resistance of the coil
b. Internal Diode resistance
c. Both a & b
d. None of the above

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