If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor
A). become more
B). become less
C). remain constant
D). none of the above
1. Piezoelectric quartz crystal resonators find application where
2. In solid insulator materials having only one kind of atom, the types of polarization which exist are
3. Example for diamagnetic materials
4. Ward-Leonard control is basically a
6. Wood is a diamagnetic material.
7. The thermal conductivity of hydrogen is ______ times that of air
8. Which of the following statements is not necessarily correct for open control system ?