1. What
will be the change in torque speed characteristics of the induction motor if
there is change in V/f ratio?

2. Can
higher starting torque be obtained at very low frequencies? Comment on the
basis of the observations.

3. Is
the speed regulation (variation of speed from no-load to full-load) the same at
different frequencies?

4. What
are the advantages and disadvantages of this method of speed control?

5. How
are the equivalent circuit parameters affected by frequency?

6. What
is the effect of variation of frequency on maximum torque, starting torque,
slip at maximum torque, if V/f is kept constant?

7. At
constant V/f, is the developed power at all frequency same at rated input
current?

8. What
do you expect, will happen to the characteristics of the induction machine, if
v/f ratio is held constant during generator mode of operation?

9. Is
the flux really held constant by keeping v/f constant? If not, how do you
ensure that flux will be held constant?

10. How
do you achieve operation above base speed?

11. What
is the major difference in performance of the induction machine fed by a
sinusoidal voltage and PWM voltage?