A. parabola
B. hyperbola
C. rectangular parabola
D. straigth line
A. it is run on load
B. it is run in reverse direction
C. it is run on voltage higher than the rated voltage
D. e.m.f. is injected in the rotor circuit
A. changing supply frequency
B. changing number of poles
C. changing winding resistance
D. reducing supply voltage
A. inversely proportional to (Vslip)
B. directly proportional to (slip)2
C. inversely proportional to slip
D. directly proportional to slip
A. supply frequency
B. supply voltage
C. copper losses in motor
D. none of the above
A. speed control is required
B. frequent starting, stopg and reversing is required
C. high starting torque is needed
D. all above features are required
A. its power factor goes on decreasing
B. its power factor remains constant
C. its power factor goes on increasing even after full load
D. its power factor goes on increasing up to full load and then it falls again