Part.1 Quiz

本页汇总课堂 quiz 选择题。参考答案与解析基于课堂 quiz answer、课件与本站笔记整理；若与课堂公布答案冲突，以课堂答案为准。标注“需人工复核”的题目表示题干或选项存在可疑之处。

Lecture 1

L1.Q1 What is a system?

A combination of components acting together to perform a specific objective B they are sets of connected objects or things C behaviors of these systems are shaped by their environments D 1 and 3 E All of the above

参考答案：E

系统不是孤立零件，而是一组相互连接、共同完成目标，并受环境影响的对象。

相关知识点： 动态系统

L1.Q2 Select the correct statement.

A dynamic systems can only be found in mechanical field B we can use physical laws to understand the performance of dynamic systems C the output of a system is only dependent on the input D All of the above E None of the above

参考答案：B

动态系统可以来自机械、电气、热、流体等不同领域；输出通常还受系统状态、参数和环境影响。

相关知识点： 描述动态系统

L1.Q3 Select the correct statement.

A force applied to a damper is inversely proportional to the velocity of the piston B dynamic systems can be modelled in mathematical terms C model can be obtained by testing a prototype of a corresponding device D 1 and 2 E 2 and 3

参考答案：E

动态系统可以用数学模型表示，也可以通过原型测试辨识；阻尼器力与速度成正比，不是反比。

相关知识点： 系统建模

L1.Q4 Select the correct statement.

A depending on the time constant, system reach to its steady state at different times B natural frequency, which describes the speed of the input C when system is overdamped, it shows both oscillatory and exponential behaviour D 2 and 3 E None of the above

参考答案：A

时间常数决定一阶系统接近稳态的快慢；自然频率是系统属性，过阻尼响应不振荡。

相关知识点： 一阶系统

L1.Q5 Select the correct statement.

A peak time is the time required for the response to reach steady state value for the first time B settling time is the time required for the response to reach its steady state value C rise time is the time taken to maximum overshoot D All of the above E None of the above

参考答案：E

Peak time 对应第一次达到峰值，settling time 要求进入并保持在允许误差带内，rise time 描述从低百分比升到高百分比的时间；三个选项都不准确。

相关知识点： 响应属性

Lecture 2

L2.Q1 Select the correct statement.

A control system consists subsystems and processes B if the output is controlled then it is a control system C control systems can be open loop or closed loop D all of the above E none of the above

参考答案：D

控制系统由子系统和过程组成，用于控制输出；按是否使用反馈，可分为开环和闭环。

相关知识点： 控制系统简介

L2.Q2 Select the wrong statement.

A a system that involves machines only called feedback control B driving a car can be considered manual control C automatically controlled systems exist in nature D all of the above E none of the above

参考答案：A

反馈控制由输出反馈信息定义，不是由是否包含机器来定义；驾驶汽车可视为人工控制，自然界也存在自动调节系统。

相关知识点： 反馈控制

L2.Q3 Select the correct statement.

A control systems can't compensate disturbances B control systems can only be useful in remote operation C closed-loop systems are less sensitive to noise D all of the above E none of the above

参考答案：C

闭环系统通过反馈改善性能，通常能降低对扰动和参数变化的敏感性。

相关知识点： 闭环系统

L2.Q4 Select the wrong statement related to design of a feedback control system.

A if testing shows that requirements have not been met, the system must be redesigned and retested B as a part of the design, description of the physical system transforms into a schematic diagram C subsystem models are interconnected to form block diagrams of larger systems D all of the above E none of the above

参考答案：E

A-C 都属于反馈控制系统设计流程：建模、连接子系统、测试，不满足要求则重新设计。

相关知识点： 设计流程

L2.Q5 Select the correct statement.

A Block diagrams cannot be used for open loop control system design B flow of signals can be clearly seen in a block diagram C block diagram algebra can be used to reduce block diagrams D 1 and 3 E 2 and 3

参考答案：E

方框图可以清楚表示信号流，也可以用方框图代数进行化简；开环系统同样可以画方框图。

相关知识点： 框图

Lecture 3

L3.Q1 Select the correct statement related to block diagram reduction.

A check for the blocks connected in series and simplify B check for the blocks connected in parallel and simplify C transfer function present in the single block is the transfer function of the overall block diagram D 1 and 2 E all of the above

参考答案：E

方框图化简会依次处理串联、并联和反馈结构，直到得到一个等效方框；该方框就是整体传递函数。

相关知识点： 方框图简化

L3.Q2 The overall transfer function from block diagram reduction for cascaded blocks is

A sum of subsystem transfer functions B product of subsystem transfer functions C difference of subsystem transfer functions D 1 and 3 E none of the above

参考答案：B

串联方框的等效传递函数相乘，即 G_1(s)G_2(s)。

相关知识点： 级联方框

L3.Q3 The overall transfer function of two blocks in parallel are

A sum of subsystem transfer functions B product of subsystem transfer functions C division of subsystem transfer functions D 2 and 3 E none of the above

参考答案：A

并联路径在同一信号流方向上相加，因此等效传递函数为各支路传递函数之和。

相关知识点： 并联/求和

L3.Q4 If the response to simultaneous control inputs and disturbances is required, they cannot be evaluated.

A True B False

参考答案：False

可以使用叠加原理：分别求参考输入响应和扰动响应，再相加得到总响应。

相关知识点： 叠加原理

L3.Q5 A disturbance to a plant is incorporated by splitting the overall transfer function of the plant and amplifier.

A True B False

参考答案：True

为了把扰动插入被控对象输入端，需要把放大器和 plant 拆成不同方框。

相关知识点： 扰动输入

Lecture 4

L4.Q1 The output of the feedback control system must be a function of

A reference input only B reference output only C output and feedback signal D input and feedback signal E none of the above

参考答案：D

反馈系统的输出同时受参考输入通道和反馈信号影响。

相关知识点： 反馈系统传递函数

L4.Q2 Select the correct statement.

A characteristic equation simplifies the evaluation of a system’s response B characteristic equation are fundamental to the analysis and design of control systems C characteristic equation can be obtained using zeros of the system D 1 and 2 E all of the above

参考答案：D

特征方程来自传递函数分母，决定极点位置；不是由零点得到。

相关知识点： 特征方程

L4.Q3 Select the correct statement, if a factor of the denominator can be cancelled by the same factor in the numerator.

A system should have equal number of poles and zeros B all of the roots of the characteristic equation should be same as the zeros C the root of this factor no longer causes the transfer function to become zero D 1 and 2 E 2 and 3

参考答案：C（需人工复核）

这里考的是 pole-zero cancellation。严格来说，被抵消的分母因子不再造成传递函数奇异/极点；原选项中的 zero 表述可能不够严谨。

相关知识点： 极点与零点

L4.Q4 Select the correct statement.

A system is stable if its transient response decays B system is stable, if all the zeros are in the right hand s-plane C when system marginally stable, at least one pole is on the imaginary axis D 1 and 3 E all of the above

参考答案：D

稳定性由极点决定：左半平面极点产生衰减响应；虚轴极点对应临界稳定。

相关知识点： 系统稳定性

L4.Q5 If the response is a decaying sinusoid

A all the poles are on the left hand s-plane B both poles and zeros are on the left hand s-plane C complex conjugate pole pair on the left hand s-plane D complex conjugate pole pair on the right hand s-plane E imaginary pole pair on the imaginary axis

参考答案：C

衰减正弦来自实部为负的复共轭极点。右半平面会发散，纯虚轴不会衰减。

相关知识点： 极点位置与响应

Lecture 5

L5.Q1 Select the correct statement/s.

A proportional controller is an amplifier with adjustable gain B derivative controller is as an amplifier with a "knob" that can be adjusted up or down. C goal of derivative feedback is to improve closed-loop system stability D 1 and 2 E 1 and 3

参考答案：E

比例控制相当于可调增益；微分反馈主要用于改善瞬态和稳定性，不是单纯的放大器。

相关知识点： 基本控制作用

L5.Q2 Derivative control is almost never used by itself, because

A it reduces the transient response B it does not supply information on the desired end state C it tends to provide no response to noise D 1 and 2 E 2 and 3

参考答案：B

微分只看变化率，不提供目标终值信息；实际中还容易放大噪声，所以通常与 P 或 PI 配合。

相关知识点： 导数控制

L5.Q3 Goal of integral control is to

A minimize the steady-state tracking error B minimize steady-state output response to disturbances C use as a reset control D 1 and 2 E all of the above

参考答案：E

积分控制的核心目标是消除/减小稳态误差，也用于扰动稳态抑制；它也叫 reset control。

相关知识点： 积分控制

L5.Q4 Select correct statement/s.

A Derivative action is used to speed the effect of the proportional action B proportional action doesn't add a steady state error C response of a second-order system to a unit step input isn't dependent on the damping D 1 and 2 E none of the above

参考答案：A

微分作用可以提前响应误差变化，增强比例作用的瞬态效果；比例控制可能留下稳态误差，二阶响应强烈依赖阻尼比。

相关知识点： PD 控制

L5.Q5 Select correct statement/s.

A Proportional control of a first-order system gives a large error for low gain B infinite proportional gain causes system to respond as a unity feedback C high proportional gain increase the time constant D all of the above E none of the above

参考答案：A

一阶系统 P 控制的终值为 K_p/(K_p+1)，低增益会带来较大稳态误差；增大 K_p 通常会减小等效时间常数。

相关知识点： 一阶系统 P 控制

Lecture 6

L6.Q1 Select the correct statement/s related to PD control.

A steady state error of a second-order system with proportional plus derivative feedback control is identical to first order system with proportional plus derivative control B proportional control increase the frequency of the response C by tuning it is possible to eliminate oscillations from the response D 1 and 2 E all of the above

参考答案：E

二阶 PD 控制中，K_p 影响闭环自然频率，K_d 影响阻尼；调参可以压低振荡，而稳态增益仍由比例项决定。

相关知识点： PD 控制

L6.Q2 Select correct statement/s related to integral control.

A first order system with integral control action eliminates the steady state error B higher K_i (say 20) gives a highly damped oscillation for first order systems C lower K_i (say 0.2) gives fast exponential response for first order systems D none of the above E 1 and 3

参考答案：A

积分控制可消除稳态误差；但 K_i 太大通常降低阻尼、加重振荡，K_i 太小则响应变慢。

相关知识点： 积分控制

L6.Q3 Select the correct statement/s related to PI control (first-order).

A integral gain influence the frequency of the response B proportional gain used to achieve the required damping C addition of proportional control to integral control action has no effect on the steady state error D 1 and 3 E all of the above

参考答案：E

一阶 PI 控制中，K_i 影响闭环自然频率，K_p 主要调阻尼；积分项仍保证零稳态误差。

相关知识点： PI 控制

L6.Q4 Select the correct statement/s related to PID control (first order).

A addition of derivative control to proportional and integral control action has no effect on the steady state error B controller may be tuned C actual response of the system doesn't dependent on damping ratio D 1 and 2 E 2 and 3

参考答案：D

PID 可通过 K_p、K_i、K_d 调参；加入 D 不改变积分项消除稳态误差的性质，而实际响应依赖阻尼比。

相关知识点： PID 控制