# 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+e2t)A
d) i=2(1+e2t)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) VR = 60(1+e2t)V
b) VR = 60(1-e-2t)V
c) VR = 60(1-e2t)V
d) VR = 60(1+e-2t)V

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

a) VL = 60(-e-2t)V
b) VL = 60(e2t)V
c) VL = 60(e-2t)V
d) VL = 60(-e2t)V