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51.

The steady state part in the expression of current in the R-L circuit is?(a) (V/R)(exp⁡((R/L)t))(b) (V/R)(-exp⁡((R/L)t))(c) V/R(d) R/VThis question was addressed to me during a job interview.I'm obligated to ask this question of DC Response of an R-L Circuit topic in portion Transients of Network Theory

Answer»

The CORRECT choice is (c) V/R

To EXPLAIN: The STEADY state part in the expression of current in the R-L CIRCUIT is steady state part =V/R. When the switch S is closed, the response reaches a steady state value after a time INTERVAL.
Discussion
52.

The expression of current in R-L circuit is?(a) i=(V/R)(1+exp⁡((R/L)t))(b) i=-(V/R)(1-exp⁡((R/L)t))(c) i=-(V/R)(1+exp⁡((R/L)t))(d) i=(V/R)(1-exp⁡((R/L)t))I had been asked this question during an internship interview.The query is from DC Response of an R-L Circuit in portion Transients of Network Theory

Answer»

Correct CHOICE is (d) i=(V/R)(1-exp⁡((R/L)t))

Easiest explanation: The EXPRESSION of CURRENT in R-L circuit is i = (V/R)-(V/R)exp⁡((R/L)t). On solving we GET i = (V/R)(1-exp⁡((R/L)t)).
Discussion