第二章 单元测试

1、单选题：
Consider the differential equation , where and is a unit step. The poles of this system are （ ）.
选项：
A:
B:None
C:
D:
答案: 【】

2、单选题：
The mathematical foundation of classical control theory includes （ ）.
选项：
A:Laplace transformation
B:All the options.
C:Differential equation.
D:Fourier transformation
答案: 【All the options.】

3、单选题：
Which of the following statements is NOT 对? （ ）
选项：
A:Laplace transformation turns the solution of differential equations into algebraic manipulations.
B:The transfer function can be applied to linear time-invariant system.
C:Transfer function model permits easy interconnection of physical systems.
D:When dealing with transfer functions, the initial conditions are assumed to be nonzero.
答案: 【When dealing with transfer functions, the initial conditions are assumed to be nonzero.】

4、单选题：
A cart of mass m = 1000 kg is attached to a truck using a spring of stiffness k =20,000 N/m and a damper of constant b = 200 Ns/m, as shown in the following figure. The truck moves at a constant acceleration of a = 0.7 m/. The transfer function between the speed of the truck and the speed of the cart is （ ）.
选项：
A:T(s) =
B:T(s) =
C:None of the above
D:T(s) =
答案: 【T(s) = 】

5、判断题：
The s-plane plot of the poles and zeros graphically portrays the character of the natural response of a system. （ ）
选项：
A:错
B:对
答案: 【对】