Electric Machine Daily Quiz #16

Angle between F f and F r is called-

1. Power angle
2. Load angle
3. Torque angle
4. Rotor angle
5. 3,4

Usually relation between Armature Resistance and Synchronous reactance is-

1. Ra:Xs = 1: 5
2. Ra:Xs = 5: 1
3. Ra:Xs = 5: 5
4. Ra:Xs = 1: 200

Transition of pf when Excitation is increased from normal to higher for Synchronous Generator-

1. Remains same
2. Mostly depends on load
3. Becomes lagging 
4. Becomes leading

Transition of pf when Excitation is reduced from normal to lower for Synchronous Motor-

1. Remains same
2. Mostly depends on load
3. Becomes lagging
4. Becomes leading

V curve is drawn between-

1. I a on X axis, I f on Y axis
2. I f on X axis, I a on Y axis
3. PF on X axis and I a on Y axis
4. I f on X axis and PF on Y axis