Question

The two types of current limiting used are electronic limiting and _________________

(a) inductance limiting

(b) capacitor limiting

(c) resistance limiting

(d) impedance limiting

This question was posed to me in a job interview.

The doubt is from Water Supply, Electrical and Road Work topic in chapter Rules and Methods of Measurement of Civil Engineering Drawing

Answer 1

Right answer is (d) impedance limiting

Explanation: Some supplies use current limiting instead of cutting off power if overloaded. The two types of current limiting used are electronic limiting and impedance limiting. The former is common on lab bench PSUs, the latter is common on supplies of less than 3 watts output. A foldback current limiter reduces the output current to much less than the maximum non-fault current.