Dennis Ritchie | End of a life well lived, beginning of a legend

Dennis Ritchie, the father of the 'C' programming language and the co-designer of the venerable UNIX operating system, passed away on 8 Oct '11.

His death has not generated nearly the amount and rhetoric that Job's has... that's just sad, it should have.

http://www.wired.com/wiredenterprise/2011/10/thedennisritchieeffect/ 

 A snippet: 

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IndianOil requires 225 engineers in 2012

Indian Oil Corporation Limited (IndianOil), the transnational energy major, is the highest ranked Indian Company at 98th position in the prestigious ‘Fortune Global 500’ list. For over five decades, IndianOil has remained a leader due to the patronage of over a billion Indians. With one of Asia’s largest network of refineries, pipelines, retail outlets and the most trusted range of brands, IndianOil us also redefining its role as a Maharatna company with a group of dedicated and ever evolving work force.


Pursuing its journey to realize its new Vision, IndianOil is transforming itself to emerge as The Energy of India and to become a globally admired company. Recognized as one of the ‘Best Employers in India’ by the Great Place to Work Institute (GPW), India, IndianOil is offering excellent career opportunities as Engineers/ Graduate Apprentice Engineers (GAEs) in the following engineering disciplines:


Civil Engineering (excluding Construction/ Transportation Engineering)
Chemical Engineering (including Petrochemicals Engineering)
 Computer Science & Information Technology
 Electrical Engineering ( including Electrical & Electronics engineering but excluding Electrical & Communication/ Telecommunication engineering)
 Instrumentation Engineering (Including Electronics & Instrumentation engineering but excluding Electronics & Communication engineering/ Telecommunication engineering)
 Mechanical Engineering (excluding Production/ Manufacturing/ Industrial Engineering)
 Metallurgical Engineering

INPUT DEVICES – SENSORS AND OUTPUT DEVICES – INDICATORS

INPUT DEVICES – SENSORS

Every electronic circuit must have some kind of input device so that we (the outside world) can "communicate" with it.

THE SWITCH

When the switch is closed it allows current to flow through it.

TYPES OF SWITCH

There are various types of switches that can do slightly different jobs in a circuit

SPST - sinqle pole, single throw

SPDT - single pole, double throw

DPST - double pole, double throw

DPDT - double pole, double throw


The diagrams show you examples of each type.

STUDENT INVESTIGATION
Which switch would you use to:
(a) change the direction of an electric motor
(b) switch on a light
(c) switch off a green light and switch on a red light
(d) switch on two motors at once

THE LIGHT DEPENDENT RESISTOR

This is a resistor which has a resistance that changes with the amount of LIGHT that falls on It. In the DARK its resistance is LARGE (millions of ohms), in the LIGHT its resistance is SMALL (tens of ohms). Very little current will flow through It In the dark.

THE THERMISTOR

This is a type resistor which has a resistance that changes with TEMPERATURE. In the COLD its resistance is LARGE (thousands of ohms), in the HEAT its resistance is SMALL (tens of ohms). Very little current will flow through it when it is cold.