Time : 3 Hrs.                                                                                                                                         Theory : 100 Marks Term Work : 25 Marks Oral : 25 Marks



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1.    Pneumatics

Pneumatic  System  Components  :  ISO  symbols,  pneumatic  air  supply  system,  Air  compressors,  Pressure

regulation devices, Directional control valves and special types of pneumatic valve such as  Pilot−operated valves, Non−return valves, Flow control valves, Sequence valves, and Time delay valve.

Linear actuators − Single−acting, Double−acting, and special type of double−acting cylinder. Rotary actuators− Air motors.

Process Control Pneumatics : Flapper Nozzle system, Volume boosters, Air relays, Pneumatic transmitters and

controllers. Pneumatic logic gates, dynamic modeling of pneumatic circuits.


2.    Hydraulics

Hydraulic System Components : Hydraulic pumps, Pressure regulation method, Loading valves.  Hydraulic valves and actuators. Speed control circuits for hydraulic actuators.

Selection and comparison of pneumatic, hydraulic and electric systems.


3.    Transmitters

Electronic  versus  pneumatic  transmitters,  2−wire;  3−wire  and  4−wire  current  transmitters,   Electronic type−temperature;  pressure;  differential  pressure;  level;  flow  transmitters  and  their   applications,  Smart (Intelligent) transmitters, Buoyancy transmitters and their applications.

Converters − Pneumatic to Electrical and Electrical to Pneumatic converters.


4.    Process Control Valves

Control valve terminology, Types−Globe, Bal, Needle, Butterfly, Diaphragm, Pinch, Gate, Solenoid,  Smart control valves, and special designs of Globe valves. Flow characteristics, Control Valve parameters− control valve capacity; valve rangeability and turn−down; valve size; and valve gain, Selection criteria. Specifications and Installation of control valves.

Valve positioners : necessity, types−motion balance and force−balance, and effect on performance of control valve.

Control  Valve  Actuators  −  Electrical,  Pneumatic,  Hydraulic,  Electro−mechanical,  and  Digital  actuators. Selection criteria of valve actuators.


5.    Auxiliary Process Control Components

Alarm  annunciators,  Square  root  extractor,  Feeders,  Dampers,  Temperature  regulator,  Flow   regulator,

Temperature switch, Flow switch, Level switch, Pressure Switch, Relief Valves, Safety valves and rupture disk. Thermostats and Humidistat.


6.    Industrial Motor Control Components

Switches : Construction, symbolic representation, working, application of Toggle switches, Push  buttons,

Selector switches, DIP switches, Rotary switches, Thumbwheel switches, Drum switch, Limit switches−contact, non contact−type, Switch specifications.

Control    Relays   :    Construction,   working,    specifications,    selection    criteria   and    applications    of

Electro−mechanical relay, Reed relay, hermetically sealed relay, Solid state relays. Interposing  relays  and

Overload relays.

Contactors/starters  :  Construction,  working,  specification  and  applications  of  starters  and   contactors. Comparison between relays and starters/contactors.

Timers : On delay timers; Off delay; and retentive timers.

Auxiliary output devices : Pilot Lights, Horns, Solenoids, Heaters and stepper motors.

Development of relay ladder and wiring diagrams for motor control applications using above components.


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