For people suffering from disabilities, here is some good news. Researchers have developed systems that read brainwaves in the form of electroencephalogram (EEG) signals in order to help the disabled control wheelchairs, play games or type on a computer. Two companies are already preparing to sell such devices to mainstream consumers. Australian company Emotiv will release a helmet equipped with 16 sensors that make it possible to direct twelve different movements in a computer game. The helmet can also detect emotions, says the company. It will be compatible with any PC running Windows and ship later this year for $299. Californian company NeuroSky too has come up with a device that can detect emotions, the firm says it can tell whether you are focused, relaxed, afraid or anxious, for example. NeuroSky does not sell it directly to the public. Instead, it is licencing its technology to other companies including Mattel, Nokia and Sega. These licensed developers will bundle the technology with their applications and sell into the retail market. Mattel, for example, will soon sell a game that involves players levitating a ball using thought alone.
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Charge your mobile anywhere the Sun is shining when electricity is unavailable. Samsung has introduced a solar-powered mobile phone, the Solar Guru (Guru E1107), in India. However, the solar power charging is only an option and not the main mode of charging. To charge the battery fully via the solar panel, the phone needs to be kept in the Sun for 40 hours. The Solar Guru can provide around Samsung Solar Guru five to 10 minutes E1107 of talk time with one hour of solar charging.Subject : electrical Engineering
Interviewer: Why is a thicker conductor necessary to carry a current in A.C. as
compared to D.C. ?
Candidate: An AC current goes up and down (drawing a sinusoid) and requires more space inside the wire, so the wire has to be thicker.
Interviewer: How will you tell if that wall outlet carries AC or DC ?
Candidate: I will put my finger in. If it is pushed away, it is DC. If it gets stuck, it
was AC.
Interviewer: How will you reverse direction of an induction motor?
Candidate: I will remove the four bolts at the base, turn the motor around, and put back the bolts.
Interviewer: How do you start a synchronous motor?
Candidate: Vrrrrrrrmmmmmmmmmmmmmmmmmmm (in rising pitch)
Interviewer: Stop! Stop!
Candidate: rrrrrrrmmmmmmmmmmmmmmmmmmmm (in falling pitch)
Interviewer: How do you limit surge current within an integrated circuit?
Candidate: By using a miniature circuit breaker.
Interviewer: " Why does a capacitor block DC but allow AC to pass through?
Candidate: See, a capacitor is like this ---| |--- , OK. DC Comes straight, like this ----------, and the capacitor stops it. But AC,goes UP, DOWN, Up DOWN and jumps right over the capacitor!"
Interviewer: "What is a step-up transformer?"
Candidate: "A transformer that is put on top of electric poles."
Interviewer (smiling): "And then what is a step-down transformer?"
Candidate (hesitantly): "Uh - A transfomer that is put in the basement or in a pit?"
Interviewer (pouncing): "Then what do you call a transformer that is installed on the ground?"
(Candidate knows he is caught -- can't answer)
Interviewer (impatiently): "Well?"
Candidate (triumphantly): "A stepless transformer, sir!"
