Q1: Which of the following terms is not applicable to Yagi-Uda array?

ANS:A - High gain

There are many factors that affect the overall Yagi antenna gain. There is a link between the gain and the beamwidth. If the Yagi gain increases, then the beamwidth decreases. This can be reasoned by thinking of the available transmit power. As there is only a certain amount of power available, to create gain, power must be taken from one direction to put into.