ASC - Machinery Automation and Control Systems

Automation processes, broadly comprises of the following components ;

• Sensors, Relays and PLC Controllers

• Sensors, Actuators and PLC Controllers

• Switches, Actuators and PLC Controllers

• Sensors, Actuators and Relay controllers

Which of the following describes the solenoid coil?

• Current flows through an electrical coil

• A magnetic field builds around it

• Magnetic field exerts a force on metal cores made from iron

• All of the above

Which of the following is a characteristic of a diode?

• When DC current is connected in the wrong polarity, a high resistance in the diode does not allow current flow, thus protecting the circuit against wrong polarity

• Diodes allows DC current flow in the reverse polarity unimpeded

• Diodes have two anodes

• A diode does not provide voltage spike protection

What is the characteristic of an AND gate?

• two or more events are "0" must occur together and at the same time for an output action to occur

• single input inverter that changes the input of a logic level “1” to an output of logic level “0” and vice versa

• an output action will become TRUE if either one “OR” more events are "1",

• two or more events are "1" must occur together and at the same time for an output action to occur

What is a ladder logic diagram?

• a graphical diagram based on the circuit diagrams to customise sequential control of electrical and mechanical systems.

• a graphical diagram based on the circuit diagrams of relay logic hardware.

• sequential control of a process or manufacturing operation is required.

• All of the above

The PLC controller consists of two basic sections, they are;

• Central Processing Unit and Comms Module

• Central Processing Unit and Power supply

• Comms Module Unit and Input/Output Interface system

• Central Processing Unit and Input/Output Interface system

What best describes the function of a diode?

• A diode serves to smoothen current fluctuations.

• When a diode is integrated into an AC circuit, it will serve to rectify the voltage to DC

• Diodes allows DC voltage flow in the correct polarity current unimpeded

• All of the above

Where is program for the PLC stored?

• In the Input module

• In the CPU module

• In the output module

• In the Power Supply module

What is the function of a capacitor?

• For correcting power factor

• Smoothen current fluctuations

• As a energy storage

• All of the above

What input signal does the CPU processes and how is it fed to it?

• Sensor --> Input module (convert to Binary) --> CPU

• Sensor --> Output module (convert to Binary) --> CPU

• Actuator --> Input module (convert to Binary) --> CPU

• Sensor --> Input module (convert to 4-20mA) --> CPU