1) Write down the characteristics of insulating material used in electrical machines.
2) Why is knowledge of phase sequence essential?
3) How can you refer the resistance from primary to secondary and viceversa?
4) Belt loads are never recommended for d.c. series motor? Explain why?
5) Sketch power flow diagram for induction motor?
6) How can we start 3 phase synchronous motor?
7) What do you mean by universal motors? What is their principle of operation?
8) Write down the difference between power transformer and distribution transformer.
9) What do you mean by an autotransformer? Where is it used?
10) What are two theories given starting of single phase induction motors? Describe them in detail.
11) Describe speed V/s armature current and speed V/s torque characteristics of D.C series motor.
12) What is effect of rotor resistance on torque slip characteristics of 3 phase induction motor? Describe graphically in detail.