b. A salient pole synchronous generator has Xq 0.8 pu and 0.02 pu. if this (3)
generator delivers rated kVA at 0.8 pf lagging and at a rated voltage, compute
the load angle

6 a. Derive expressions for armature to field mutual inductances and armature (6) self

inductances fora salient pole synchronous machine.

b. Draw an electrical equivalent circuit of a separately excited dc generator

part C- Module (V &VI)

7 a. Draw the generalized mathematical model of a poly phase induction (6) machine.
Write down the voltage equations for the model and obtain there from the equivalent
circuit for a poly phase induction motor

b. A10 kW, 50 Hz, 6 pole, poly phase induction motor has a full load slip of 0.04. (6)
If its friction and windage losses are 4% of the output, then compute the
rotor copper loss at full load, full load electromagnetic torque and rotor

efficiency

8 a. Compare the performance of a single cage and double cage motor of the (4) same
rating.
b. Derive the equivalent circuit of a single phase induction motor with the help (8) of

doubte field revolving theory

9 a. Compare single phase and poly phase induction motors (4) b. A 230V, a pole, 50 Hz
single phase induction motor has the following (8) constants and losses: rl = 2.30, 3.2
Q, 4.20, x2 = 3.20, Xm =74Q, core loss = 98 W, friction and windage loss = 30W. If this
motor is running with a slip 0.05 at rated voltage and frequency, then compute the

stator current, pf, power output, torque and efficiency with its auxiliary winding

open.