Sunday, 21 February 2010

Answer key classwork 1

Class work 1 Student name:
Module (1) Class

Q1) Define (what is) the Electo-Pneumatics

It is the use of electrical signals to control pneumatic systems

Q2) List three applications of electro-pneumatics
• Filling
• Packaging
• Handling of work pieces
• Stamping
• Metal forming
• Automation processes

Q3) State three advantages of electro-pneumatics

• Cheap
• Greater reliability
• Easy handling
• Simple installation
• Easily modified and adapted
• Secure mounting


Q4) Give two examples of signal processing in electro-pneumatics

Relays
Contactor
PLC

Q5) Give two examples of signal input in electro-pneumatics

Pushbutton switches
Limit switches
Sensors

Q6) Give two examples of signal output in electro-pneumatics

5/2 single solenoid valve
5/2 double solenoid valve

Q7) Give two examples of command execution in electro-pneumatics

Cylinders
Motors
Optical display

Q8) List four electro-pneumatic components

DC power supply
Switches
Relays
Sensors
Solenoid valves
DC power supply
Switches
Relays
Sensors
Solenoid valves

Q9) What are the two types of electric current

Direct current DC
Alternating current AC


Q10) What is the function of the DC power supply

It is used to convert the 230 V AC into 24 V DC

Q11) what are the three components which consist the DC power supply

1- Transformer used to reduce the voltage from 230 V to 24 V
2- Rectifier used to convert the current from AC into DC
3- Stabilizer used to smooth and maintain constant voltage at the output

Q12) List three types of switches
1- Pushbutton switches
2- Control (Detent) switches
3- Limit switches

Q13) what is the difference between control (detent) switch and pushbutton switch

If you release the switch
The pushbutton will return back to the normal position
The detent will remain in the last position

Q14) what is the difference between N/O pushbutton switch and N/C pushbutton switch

N/O pushbutton switch is used to connect the current
N/C pushbutton switch is used to interrupt (cut) the current

Q15) what are the types of contacts in pushbutton switches

1- N/O switches
2- N/C switches
3- Changeover switches

Q16) What is the function switches

They are used to connect and interrupt the electric current

Q17) What is the function of the limit switch

It is used for automatic operation

Q18) which part in pneumatic system is similar to the electrical limit switch

3/2 way valve, roller lever operated

Q19) what is the relay

It is an electromagnetic switch and it has a coil and some contact points

Q20) List two advantages of relays

1- it can be used to switch one or more contacts
2- it is used to switch a high current with a low current circuit



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