Question

The Isolation transformers are generally used for

(a) protecting low power circuit

(b) isolation

(c) protecting low power circuit and isolation

(d) none

I have been asked this question during an interview.

Enquiry is from Interfacing Digital to Analog Converters, Stepper Motor Interfacing and Control of High Power Devices Using 8255 topic in section Basic Peripherals and their Interfacing with 8086/88 of Microprocessor

Answer 1

Correct answer is (c) protecting low power circuit and isolation

Best explanation: Any switching component of a high power circuit may be sufficient to damage the microprocessor system. So, to protect the low power circuit isolation transformers are used. They are also used if isolation is necessary.