Mechatronics Flashcards by Barbara Lam

The diagram shows

OR logic - either input may be on to energize the coil.

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Match the following type of switch.

Temperature

Level

Flow

Pressure

Flow

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True or False: By changing the amplitude of a PWM signal, it is possible to change the direction of a servo motor.

False

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True or False: An open-loop controller is also called a feedback controller.

False

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The electric shock intensity

increases with an increase in current flow
increases with the length of time of exposure
is determined in part by the pathway the current takes through the body
all of these

all of these

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The central part of the motor with no windings that moves is called the ________

Rotor

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Pneumatics

Is the field of liquid fluid power

Is the field of gas fluid power

The study of electrical fields

Motor control theory

Is the field of gas fluid power

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As a PLC Programmer which one of these should be your objective(s).

Write a program that workds per specification.

Write code that protects equipment and ensures safety of operators. For example, adding alarms and soft-locks.

Do not comment so only you know how it works. This way understanding/debugging will be easiest for anyone reading the code.

Write a program that works per specification.
Write code that protects equipment and ensures safety of operators. For example, adding alarms and soft-locks.
Write code in modular blocks and with comments. This way understanding/debugging will be easiest for anyone reading the code.

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A ________ switch can be actuated without any physical contact.

level

proximity

pressure

limit

proximity

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A PLC is an

Industrial computer with specialized hardware and software

Relay replacer

Modern Industrial controller

All of the above

Industrial computer with specialized hardware and software
Relay replacer
Modern Industrial controller
All of the above

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Shown above is ladder logic for high temperature alarm. The timer will be enabled when “WX0: is above this _____ value.

3334

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A single-acting pneumatic cylinder

Actuates in one direction and spring or mechnically returns

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Solenoid valves are available to control:

Oil flow

Air flow

Water flow

All of these

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Which of the following will generate a “communication error” between an OIT and PLC?

Syntax error in PLC

Mismatch of communication protocol between OIT and PLC.

Bad communication cable.

No backup battery in PLC.

Mismatch of communication protocol between OIT and PLC

Bad communication cable

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Two sources of energy are produced by a Cogeneration plant: Electricity and ____________.

Salt

Nitrogen

Heated water

Oxygen

Heated water

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Variable Frequency Drives (VFDs) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to it. Match the characteristics of the signal from VFD that controls the response of electric motor.

RPM of motor

Amplitude of signal

Frequency of signal

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Load of motor

Amplitude of signal

Frequency of signal

Amplitude of signal

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In order to use a solenoid valve on a pneumatic cylinder

The exhaust must be released from the opposite end of the cylinder.
The pressure rating of the valve must exceed the opposite end of the cylinder.
The operating voltage must be equal to the PLC output voltage.
All of the above.

All of the above

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The stationary part of the winding of the motor is called the _______.

Rotor

Commutator

Capsule

Stator

True of False: A controller in a closed-loop system adjusts the control signal to the system based on current state of input and current output.

True

What is the difference between process and motion control?

Process Control - the setpoint typically remains unchanged, and emphasis is on maintaining a constant condition.

Motion Control - the setpoint is constantly changing, and the emphasis is on following the changes as quickly as possible.

Process Control - the setpoint continuously changes on changing output of the system.

Motion Control - the setpoint changes both on output and external temperature.

Process Control - the setpoint is constantly changing, and the emphasis is on following the changes as quickly as possible.

Motion Control - the setpoint typically remains unchanged, and emphasis is on maintaining a constant condition.

Process Control - the setpoint typically remains unchanged, and emphasis is on maintaining a constant condition.

Motion Control - the setpoint is constantly changing, and the emphasis is on following the changes as quickly as possible.

Output modules provide the interface to devices like

motors, pilot lights and alarms.

pushbuttons, limit switches and selector switches

analog devices

timers and counters

motors, pilot lights and alarms

A double-acting pneumatic cylinder

Actuates in one direction and spring or mechanically returns

Actuates in two directions - in and out.

Rorates the shaft

Actuates in two directions - in and out.

In the diagram, contact X1 does what?

Releases the sealing circuit and turns off relay Y0.

Temporarily turns off the Y0 relay

Allows X1 to operate

All of the above

Releases the sealing circuit and turns off relay Y0.

What is the proper distance from the feet of a straight ladder to the wall? one-half the height of the ladder one-fourth the working height of the ladder three-quarters the height of the ladder one-half the working height of the ladder

one-fourth the working height of the ladder

Match the following type of switch. Temperature Level Flow Pressure

Pressure

Match the following type of switch. Temperature Level Flow Pressure

Temperature

Match the following type of switch. Temperature Level Flow Pressure

Level

Which of the following statement(s) is correct about the logic shown. Stage transitions are as follows: S0, S1, S2 Stage S1 is never executed. Stage transistions are follows: S0, S2, S1 Stage S2 is never executed.

Stage S1 is never executed.

Select the logic(s) that are correct. Coil C0 = OFF, Coil C1 = OFF, Coil C2 = ON, Coil Y0 = ON Coil C0 = ON, Coil C1 = OFF, Coil C2 = OFF, Coil Y0 = ON Coil C0 = OFF, Coil C1 = ON, Coil C2 = OFF, Coil Y0 = OFF Coil C0 = ON, Coil C1 = ON, Coil C2 = OFF, Coil Y0 = ON

Coil C0 = OFF, Coil C1 = OFF, Coil C2 = ON, Coil Y0 = ON Coil C0 = ON, Coil C1 = OFF, Coil C2 = OFF, Coil Y0 = ON Coil C0 = OFF, Coil C1 = ON, Coil C2 = OFF, Coil Y0 = OFF

One of the components of a typical PLC are: Processor (CPU) Input modules Output modules Power supply. All of the above

All of the above

Two sources of energy are produced by a Cogeneration plant: Electricity and \_\_\_\_\_\_\_\_. Salt Nitrogen Heated water Oxygen

Heated water

Below is an example of motor control logic. Which of the following statement(s) is true? The motor (Y)) has to wait 2 seconds before it can be restarted. The Motor (Y0) will need a five (5) minute delay between each start. The MotorRestLock (CT0.Done) cannot be overridden by Start (X0). The Motor (Y0) will need a five (5) minute delay after every two consecutive starts before it can be restarted.

The MotorRestLock (CT0.Done) cannot be overridden by Start (X0). The Motor (Y0) will need a five (5) minute delay after every two consecutive starts before it can be restarted.

An electrical device that is commonly used to increase or decrease AC voltage levels. Transformer Resistor Capacitor Inductor

Transformer

A limit switch is usually actuated by: hand contact with an object pressure an electromagnet

contact with an object

Given is an example of logic that keeps track of number of pump starts. What will be the value of CT0.Acc after the pump stops for the second time. 0 1 2 3

In the diagram, contact X1 does what? Releases the sealing circuit and turns off relay Y0. Temporarily turns off the Y0 relay. Allows X1 to operate All of the above.

Releases the sealing circuit and turns off relay Y0.

True or False: VFDs can help reduce energy costs for industrial applications because they allow you to match speed of the motor driven equipment to the load requirement. True False

True

The _________ is used to turn the generator in a hydroelectric power plant. Rotor Stator Turbine Electrical power

Turbine

The graph shows mapping of a 12bit 4-20 mA analog current input to decimal value. What will be an approximate decimal reading if current input is 15 mA?

2815

The diagram shows: AND logic - both inputs must be on to energize the coil. OR logic - either input may be on to energize the coil. Sealing circuit in order to latch the output. None of the above

AND logic - both inputs must be on to energize the coil.

What will be the maximum decimal reading from a 16 bit 4-20 mA analog input card? 32 256 65535 55000

65535

Shown above is ladder logic for high temperature alarm. The timer will be enabled when "WXO" is above this \_\_\_\_\_\_value.

3334

Based on the ladder logic above, which type of push button would be most appropriate to implement an "Alarm Reset" (DLC1) in OIT? momentarily off momentarily on toggle off toggle on

momentarily on