A synchronous motor operates at 0.8 pf lagging. If the field current of the motor is continuously increased

1. The power factor decreases upto a certain value of field current and thereafter it increases.

2. The armature current increases upto a certain value of field current and thereafter it decreases.

3. The power factor increases upto a certain value of field current and thereafter it decrease

4. The armature current decreases upto a certain value of field current and thereafter it, increases.

From these, the correct answer is (a) 1, 2 (b) 3, 4 (c) 1, 3 (d) 2, 4

1. The power factor decreases upto a certain value of field current and thereafter it increases.

2. The armature current increases upto a certain value of field current and thereafter it decreases.

3. The power factor increases upto a certain value of field current and thereafter it decrease

4. The armature current decreases upto a certain value of field current and thereafter it, increases.

From these, the correct answer is (a) 1, 2 (b) 3, 4 (c) 1, 3 (d) 2, 4