1. - In a three phase system with line voltage 208V,
    a) The phase voltage is: ___________________________

    b) the power delivered to a 3-phase load of 15 Ohms is: ___________________

2. - A store 60 x 120-ft has 60 ft of show window. There are a total of 80 duplex receptacles. The service is 120/240 V., 1- ph.. Calculate the minimum size feeder, the main entrance pipe and the ground conductor size.

3. In a multimotor machine, the load consists of one 10-hp, two 71/2-hp, and two 5-hp motors, rated 460 V., 3-ph. Calculate the needed wire in the feeder.

4. - A 3-hp, 240 V., 1-ph. Motor is installed 250 ft apart from the panel. The maximum acceptable voltage drop is 5%. Calculate the needed feeder.