Answer: A. 58. The first-order step response for RC circuit can be represented as ____ for t≥0

58. The first-order step response for RC circuit can be represented as ____ for t≥0

A. v_C(t)=[v_C(0) – v_C(∞)]e^-t/Tc B. v_C(t)=[v_C(∞) – v_C(0)]e^-t/Tc+ v_C(∞)

C. v_C(t)=[v_C(∞) – v_C(0)]e^-t/Tc D. v_C(t)=[v_C(∞) – v_C(0)]e^-t/Tc- v_C(∞)

E. v_C(t)=[v_C(0) – v_C(∞)]e^-t/Tc + v_C(∞)

Solution:

1)

2)

Answer: E.

The real part of impedance is called ______ and imaginary part is called _____. The real part of admittance is called ______ and imaginary part is called _____.

A. resistivity,…conductivity,… susceptance,… conductance

B. reactance,…resistance,… susceptance,… conductance

C. resistance,…reactance,… susceptance,.. conductance

D. reactance,…resistance,…conductance,…susceptance

E. resistance,…reactance,…conductance,…susceptance

 

Solution:

Z = R ± jX

Y = G ± jB

The real part of impedance is called resistance and imaginary part is called reactance. The real part of admittance is called conductance and imaginary part is called susceptance.

Answer: E.

 

60. The general view of exponential function is

A. v(t)=[V_Ae^-t] B. v(t)=[V_Ae^-t] u(t) C. v(t)=[V_Ae^-t/Tc] D. v(t)=[V_Ae^-t/Tc]u(t)

E. v(t)=[V_Ae^t/Tc]u(t)

Answer: D.

 

61. Two circuits are said to be equivalent if they have

A. the same view after reduction process

B. identical i-v-characteristics after reduction process

C. identical i-v-characteristics at a specified pair of terminals

D. identical i-v-characteristics

E. identical parameters of elements