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It is well kmown that the voltage drop across a resistor follows Ohm's Law:
V = RI
where I'R is the voltage drop in V. R is the resistance in a and /is the current in A. Employ the experimental data given in Table-1 below:
I in A = 4.3, 6.5
VR in V= 18, 30.5
Table-1: Resistor Voltage Drop with Current
Estimate the current for a voltage of v Volt, where v=(i+7)-th prime number and i=2 and hence find the value of R. (i) Use lincar interpolation method (ii) Use quadratic interpolation method (iii) Use Divided difference interpolation method. Hence compare the results obtained these methods.
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A 1100 V ,50 Hz, delta connected induction motor has a star connected slip ring rotor with a phase transformation ratio of 3.8. The rotor resistance and standstill leakage reactance are 0.012 Ω/phase and 0.25 Ω/phase respectively. Neglecting the stator impedance and magnetising current determine the rotor current at 4 % slip with slip rings shorted
A 150 KW ,3000 v, 50 Hz, 6-pole-star-connected induction motor has a start connected slip-ring with a transformation ratio of 3.6 (stator/rotor). The rotor resistance is 0.2 Ω/phase and its per phase/leakage reactance is 14.7 Ω/phase. The stator impedance may be neglected. Find the starting current and starting torque at rated voltage with short circuited slip–ring.
A three phase induction motor is wound for 4 poles and is supplied from 50 Hz system. Calculate the rotor frequency when the rotor runs at 600 r.p.m.
The stator of a three phase induction motor operates from a supply whose frequency is 50 Hz. Calculate the number of stator poles and total number of slots 1n the stator.
