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Description : 9 leds each of 1 volt drop is series with 9  volt battery , do we need a resistor?(SMD leds) I have seen some smd leds without resistor !

Answer : We connect resistor to limit the current. So, it depends upon the current rating of the LED, which is provided by manufacturer.

Description : Why capsule are preferred to powder.

Answer : Drug with unpleasant taste and odor can be administered. Very smooth and slippery. Economical. Easy to handle. Made of gelatin, hence inert. Attractive in appearance. Available in various sizes.

Answer : The D.C. motors preferred for traction applications beacuse the speed is inversely proportional to the torque and the torque is proportional to square of armature current.

Description : Why thyristor are not preferred for inverter?

Description : Find out number of data lines required to interface 16 LEDs arrange in the 4 x 4 matrix form.

Answer : 4+4=8, eight lines are required for 4x4 matrix of 16 LEDs