Electronics Engineering Question:

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Explain at what voltage does land line telephone operate?

Electronics Engineering Interview Question
Electronics Engineering Interview Question

Answer:

The normal telephone system works on -48vDC on hook when the phone goes off hook, the voltage drops to about 10v but reverses polarity.

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Explain why does all cellular networks have same shape of SIM? Why is it designed in such a particular shape? Does it have any other shape?What is the Value of binary number with n digit, all of which are unity?
a) 2 to the power n
b) 2 to the power (n-1)
c) (n square) - 1
d) (2 to the power n) - 1