# DC Response of an R-L Circuit MCQ’s

This set of Network Theory Multiple Choice Questions & Answers (MCQs) focuses on “DC Response of an R-L Circuit”.

1. 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/V

2. In the expression of current in the R-L circuit the transient part is?

a) R/V

b) (V/R)(-exp((R/L)t))

c) (V/R)(exp((R/L)t))

d) V/R

3. 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))

4. The value of the time constant in the R-L circuit is?

a) L/R

b) R/L

c) R

d) L

5. A series R-L circuit with R = 30Ω and L = 15H has a constant voltage V = 60V applied at t = 0 as shown in the figure. Determine the current (A) in the circuit at t = 0^{+}.

a) 1

b) 2

c) 3

d) 0

6. The expression of current from the circuit shown below is?

a) i=2(1-e^{-2t})A

b) i=2(1+e^{-2t})A

c) i=2(1+e^{2t})A

d) i=2(1+e^{2t})A

7. After how many time constants, the transient part reaches more than 99 percent of its final value?

a) 2

b) 3

c) 4

d) 5

8. The expression of current obtained from the circuit in terms of differentiation from the circuit shown below?

a) di/dt+i=4

b) di/dt+2i=0

c) di/dt+2i=4

d) di/dt-2i=4

9. The expression of voltage across resistor in the circuit shown below is?

a) V_{R} = 60(1+e^{2t})V

b) V_{R} = 60(1-e^{-2t})V

c) V_{R} = 60(1-e^{2t})V

d) V_{R} = 60(1+e^{-2t})V

10. Determine the voltage across the inductor in the circuit shown below is?

a) V_{L} = 60(-e^{-2t})V

b) V_{L} = 60(e^{2t})V

c) V_{L} = 60(e^{-2t})V

d) V_{L} = 60(-e^{2t})V

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