Question No 1: (a) Describe the working principle of synchronous motor? (b) Disc

Question No 1: (a) Describe the working principle of synchronous motor? (b) Discuss different methods of starting synchronous motor.? Question No 2: (a) define construction of synchronous generator? (b) describe armature winding armature reactance of synchronous generator ? Question No 3: (a) describe the construction and working principle in induction motors? (b) if the e.m.f in the rotor of 8 pole induction motor has a frequency of 1.5 H.
Question No 1: (a) Describe the working principle of synchronous motor? (b) Discuss different methods of starting synchronous motor.? Question No 2: (a) define construction of synchronous generator? (b) describe armature winding armature reactance of synchronous generator ? Question No 3: (a) describe the construction and working principle in induction motors? (b) if the e.m.f in the rotor of 8 pole induction motor has a frequency of 1.5 H.Z and that in the stator 50 HZ at what speed is the motor running and what is the slip? Question No 4: a 4 pole 50 HZ 3-induction motor develops a max: torque of 162.8 N-m at 1365 rpm. The resistance of start-converted rotor is 0.2/phase. Calculate the value of resistance that must be inserted in series with each rotor phase to produce a starting torque equal to half the max: torque. Question No 5: (a): define law of illumination? (b) describe the construction of sodium lamp?
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