3. What must be the speed of a six-pole 25-Hz synchronous generator? -a) 500 rpm b) 900 грm c) 1200 rpm d) none of the above 4. A three-phase generator has a load of 100 kW per phase at a power factor of 80 percent, lagging. A) What is the three-phase kilowatt load? a) 30.1 kW b) 300 kW c) 375 kW d) none of the above B) What is the three-phase kilovoltampere load? a) 30.1 kVA b) 300 kVA c) 375 kVA d) none of the above C) What is the line current if the line voltage is 7200 V? a) 30.1 A -b) 300 A c) 375 A d) none of the above 5. The line voltage of a wye-connected 2400-V 600-kVA unity power factor AC generator is reconnected for delta operation. What is the new voltage, current, and kilovoltampere rating? A) Voltage a) 1385.6 V b) 2400 V c) 4156.9 V d) none of the above

A semiconductor is a crystalline material. Please choose one: a. have strong covalent bonds between neighboring atoms b. has many free electrons held by the attraction of positive ions c. with only one electron in its outer shell D. has a full valence shell