Mulitple questions on energy systems 1 A synchronous generat

Mulitple questions on energy systems

1. A synchronous generator has a a. DC magnet on the Stator and current going from the Stator Phase voltage to the Armature Voltage b. DC magnet on the Rotor and current going from the Stator Phase voltage to the Armature Voltage c. DC Magnet on the Stator and current going from the Rotor to the Stator Phase voltage. d. DC Magnet on the Rotor and current going from the Rotor to the Stator Phase voltage. 2. The Rotor of a synchronous generator must spin at a. The same speed as the electrical 3 phase frequency b. At a speed determined by the number of poles on the stator c. At a speed slight below the speed of the electrical 3 phase frequency d. At a speed slightly slower than the speed determined by the number of poles on the Stator. 3. If a lagging load is put on a synchronous generator but the field current is not changed: a. The phase voltage will increase and the magnitude of the current will stay the same b. The phase voltage will decrease and the magnitude of the current will decrease c. The phase voltage will increase and the magnitude of the current will decrease d. The phase voltage will decrease and the magnitude of the current will increase. 4. If a synchronous motor has the rotor field increased while the load is held constant, the a. The magnitude of the Armature Voltage will increase and the Phase current will become more lagging b. The magnitude of the Armature Voltage will increase and the Phase current will become more leading c. The Output Power will stay the same and the Phase current will become more leading d. The magnitude of the Armature Voltage will decrease and the Phase current will become more lagging.

Solution

1.b

2.d

3b

4.a

7.b

8.b

11.a

12.b

14.b

15b

16.a