自动化生产线安装与调试-双语版答案2023秋

第四章测试

1.The sensor is a kind of sensory device such as human eyes, ears, nose and so on__________The device can sense the specified measurement and convert it into electrical signal output according to certain rules. （ ）
A:Implementation B:Storage C:Detection D:Control
答案:C
2.__________principle is used for photoelectric proximity switch (referred to as photoelectric switch), which is used to detect the presence of objects and surface state changes, etc.（ ）
A:Inductance effect B:Hall effect C:Photoelectric effect D:Magnetic induction effect 3.The photoelectric proximity switch is mainly composed of light transmitter and light receiver. If the light emitted by the light emitter is masked or reflected due to different objects detected, the amount of light reaching the light receiver will change. The sensing element of the optical receiver will detect this change and convert it into an electrical signal output.（ ）
A:对 B:错 4.According to the different ways of receiving light, the photoelectric proximity switch can be divided into three types: the opposite type, the reflection type and the diffuse type.（ ）
A:对 B:错 5.In automatic production line, proximity switch is usually connected with PLC input as signal input element. Before wiring, the signal output and the positive and negative outgoing lines of the power supply should be identified first, which can be distinguished by colors according to the relevant international standards: Brown is the positive pole of the DC circuit, blue is the negative pole, and black is the signal output line.（ ）
A:对 B:错 6.The installation and wiring of optical fiber sensor has been completed, mainly the adjustment of amplifier sensitivity. The sensitivity refers to the ability to detect the object when the fiber head is at a certain distance from the object to be detected. The sensitivity is not only related to the distance, but also to the size, surface state and color of the detected object.（ ）
A:对 B:错 7.the inductive proximity switch uses inductance coil in high frequency oscillator (LC oscillator) as detection element. The eddy current effect will be produced when metal object is close to inductance coil, which will cause amplitude or frequency change of oscillator. Signal conditioning circuit of sensor (including detection, amplification, shaping, output and other circuits) will convert the change into switch output, so as to achieve detection Purpose.（ ）
A:错 B:对 8.The inductive proximity switch is used_____________Manufactured sensors.（ ）
A:Photoelectric effect B:Eddy current effect C:Hall effect D:Magnetic induction effect 9._____________ is a kind of sensor which converts the mechanical and geometric displacement output to the shaft into pulse or digital signal through photoelectric conversion. It is mainly used for the detection of speed or position (angle).（ ）
A:Rotary encoder B:Magnetic switch C:Inductive proximity switch D:Photoelectric proximity switch 10.the minimum resolution angle of the sensor is determined by the number of fringes on the grating disk of the photoelectric encoder, that is, the resolution angle α = 360 ° g fringe number.For example, if the number of fringes is 500 lines, then the resolution angle α =_______。（ ）
A:1.48 B:360 C:0.72 D:500 11.Two slits are set on the light barrier board In order to provide the information of rotation direction, the A-phase slit corresponds to the A-phase luminous element and the light receiving element; similarly, the B-phase slit corresponds to the B-phase luminous element and light receiving element. If the ratio of the distance between the two slits and the grating spacing t satisfies a certain relationship, the phase difference between a and B pulse trains can be90 º. When the A-phase pulse is ahead of B-phase, it is the forward rotation direction, and when the B-phase pulse is ahead of a phase, it is the reverse direction.（ ）
A:错 B:对 12.Since the working current of encoder used in sorting unit reaches 110mA, attention should be paid to the positive power lead (red) of encoder must be connected to + 24V regulated power supply terminal at the device side connection port, and should not be connected to the power terminal VCC with internal resistance. Otherwise, the voltage drop of working current on the internal resistance is too large, so that the encoder can not work normally.（ ）
A:错 B:对 13.The pneumatic technology is an engineering technology that uses compressed air as power source to transmit energy or signal. It is one of the important means to realize various production control and automatic control.（ ）
A:错 B:对 14.___________is used to produce enough pressure and flow of compressed air and its purification, treatment and storage of a set of devices.（ ）
A:Solenoid valve B:Air source device C:Sensors D:Cylinder 15.The double acting cylinder has the advantages of simple structure, stable output force, and the stroke can be selected according to the needs. However, due to the use of compressed air alternately acting on the piston to achieve telescopic movement, the effective area of compressed air during retraction is small, so the force generated is less than the thrust generated when extending.（ ）
A:对 B:错 16._____________ is a kind of non-contact position detection switch, which has the advantages of no wear and damage to the detection object. It is often used to detect the existence of magnetic field or magnetic material.（ ）
A:Magnetic switch B:Microswitch C:Photoelectric proximity switch D:Travel switch 17.The valve which uses the electromagnetic coil to electrify, the static iron core produces electromagnetic attraction to the moving iron core to make the valve switch, so as to change the direction of air flow, is called the electromagnetic control directional valve, referred to as the solenoid valve. This kind of valve is easy to realize electric and pneumatic joint control and can realize remote operation, so it is widely used. According to the control number, the electromagnetic directional valve has two types: single electric control and double electric control.（ ）
A:错 B:对 18.The difference between double electric control solenoid valve and single electric control solenoid valve is that for single electric control solenoid valve, when there is no electric control signal, the valve core will be reset under the action of spring force, while for double electric control solenoid valve, when there is no electric control signal at both ends, the position of valve core depends on the action result of the previous electric control signal.（ ）
A:对 B:错 19.The two electric control signals of the double electric control solenoid valve cannot be "1" at the same time, that is, the two coils are not allowed to be powered on at the same time in the control process, otherwise, the solenoid coil may be burned out, of course, in this case, the position of the valve core is also uncertain.（ ）
A:对 B:错 20.The programmable logic controller (PLC) is widely used in modern automatic production equipment with its high anti-interference ability, high reliability, high performance price ratio and simple programming. It plays the the brain the production --role of line controller.（ ）
A:对 B:错 21.The transistor output PLC can only control the low-voltage DC circuit of 24 VDC × 300mA, with small driving current, high operation frequency and long service life.（ ）
A:对 B:错 22.PLC control process is generally: input refresh → run user program → output refresh, then input refresh → run user program → output refresh, never stop scanning according to the above process. In each cycle, the "running user program" phase starts from the first program and executes one by one according to the sequence of program storage without interruption or jump control until the end of the program. This working mode of PLC is called scanning mode, and its characteristics can be summed up as "cyclic scanning, sequential execution".（ ）
A:错 B:对 23.the E3Z-LS63 photoelectric switch (made by Omron, Japan) used in the feeding unit is shown in the figure. If you want the sensor to have a signal after the workpiece is detected, the action switch in the photoelectric switch should be set to___________pattern.（ ）
A:D B:A C:L D:C 24.In the E3Z-LS63 photoelectric switch (made by Omron, Japan) used in the feeding unit, there is a stable display lamp (green LED) in the status indicator lamp, which is used to self diagnose the margin of environmental changes (temperature, voltage, dust, etc.) after setting. If the margin is sufficient, the display light will be on. On the contrary, if the display light goes out, it means that the site environment is not suitable, and the fault should be eliminated from the environmental aspects, such as high temperature, low voltage, insufficient light, etc.（ ）
A:错 B:对