Thefigureshowsfourcircuits.Answerthefollowingquestions.When,thecircuitsrepresentthecharacteristicofopencircuitareshowninFig______.

问答题

The circuit is shown in the figure. The given conditions are the current source I˙S=1∠30∘A, the voltage source U˙S=50∠−60∘V and the impedances Z1=20Ω, Z2=15−

单选题

If a device is driven by current signal, what is the ideal value of its input resistance?

问答题

For the sub-circuit, the equivalent impedance seeing from the primary side is
Zeq=[填空1]Ω.

多选题

Which of the following facts might be the reasons for the malfunction of the conceptual amplifier?

问答题

For the circuit, when the loadRL=[填空1]Ω, it obtains the maximum power PL=[填空2]mW:

问答题

As the circuit shown in the figure, uS is a sinusoidal ac source with angular frequency ω. U0 is dc voltage. R1=1Ω,R2=2Ω,ωL=1Ω,1/(ωC)=4Ω. The reading of voltmeter is 10V and the reading of ammeter is 2A (both effective value). Find:

1) DC source voltage U0＝[填空1] V and the mean power delivered by DC source is

问答题

Fill in the blank

For the circuit, we can set uC and iL as the state variables, and iR as output variable. The state equation has the form of

and the output equation has the form of

Fill in the following blanks.
A=[填空1], B=[填空2], C=[填空3], D=[填空4], E=[填空5], F=[填空6], G=[填空7], H=[填空8], I=[填空9].

问答题

For the sinusoidal steady state circuit, find the resonant frequency ω0=[填空1]rad/s and the resonant input impedance Z0=[填空2]+j[填空3]Ω.

单选题

The figure shows four circuits. Answer the following questions.

When

, the circuits represent the characteristic of open circuit are shown in Fig ______.

单选题

For the one-port network in the figure, if - satisfies

what type of one-port is it?

问答题

Write the node voltage equations for the circuit shown in Figure 5-6, and solve the current I flows through 5Ω resistor.

I=[填空1]A

问答题

Fill in the blank

For the circuit, if we list the ODE with the voltage uR as the variable, we can get duRdt+AuR=B; if we list the ODE with the voltage uC as the variable, we can get duCdt+CuC=D. In these ODEs, A=[填空1]and C=[填空2]

问答题

As the circuit shown in the following figure, when 3A current source is open-circuited, the power delivered from 2A current source is 28W, and U2 = 8V. When 2A current source is open-circuited, the power delivered from 3A current source is 54W, and U1 = 12V. Find the power delivered from each current source, P2Adeliver=[填空1]W, P3Adeliver=[填空2]W, when both of them take effect.

问答题

Fill in the blank
For the buffer circuit discussed in this lecture, we know that CGS=10pF, RON=100Ω, and RL=10kΩ for both inverters. The time constant for the period when the input changes from “1” to “0” is τ=[填空1]ns.

单选题

How many controlled sources are required at least in an equivalent circuit of an unreciprocal two-port network?

问答题

传统社区是人服从于技术,智慧社区是技术服务于人。( )

问答题

智慧的技术有助于推动社区中的垃圾分类。

问答题

电影《少数派报告》表明,未来是不可预知的。( )

问答题

智慧交通已成为未来交通运输业优先发展地主题。( )

单选题

相对于传统政府的垂直化层次结构,电子政府体现的是( )。