Draw and explain the operation of H-type with 4-switches per phase drive circuit and the drive circuit for bifilar winding for stepper motor. In which types of stepper motors these circuits are used?

Fill in the blank: 1- Lap winding is suitable for ----- current, voltage d.c. generators. 2-A 220 V shunt motor develops a torque of 54 N-m at armature current of 10 A. The torque produced when the armature current is 20 A, is N-m. 3- The d.c. series motor should never be switched on at no-load because 4- The equation relating the generated e.m.f., E, terminal voltage, armature current and armature resistance for a d.c. motor is E = ‒‒‒‒‒‒‒‒‒‒‒ 5- A transformer having 1000 primary turns is connected to a 250 V a.c. supply. For a secondary voltage of 400 V, the number of secondary turns should be turns. 6- The equivalent resistance of the primary of a transformer having N2/N1 = 5 and R1 = 0.1 ohm when referred to secondary becomes ohm. 7- The maximum efficiency of a 100 kVA transformer having iron loss of 900 W and F.L. cu loss of 1600 W occurs at - kVA. ‒‒‒‒‒‒ ‒‒‒‒‒‒‒ 8- If Cu loss of a transformer at 7/8 full load is 4900 W, then its full-load Cu loss would be watt.

The following figure shows the circuit of a DC drive system. Choose the right expression concerning this system. Forward bridge Reverse bridge L1 L1 L2 L3 23 Armature Shunt field L3 23 L2 O a. This drive is a Regenerative DC drive. It allows controlling the motor speed ONLY below its base speed. Changing the rotation direction requires to feed the motor from the reverse bridge. The reverse bridge is also used while braking to transform the excess energy into AC and feed it to grid lines O b. This drive is a Non-regenerative DC drive. It allows controlling the motor speed below and above its base speed. Changing the rotation direction requires external contactors to be connected. The reverse bridge is used while braking to direct the excess energy to braking resistor bank Oc. None of the choices Od. This drive is a Regenerative DC drive. It allows controlling the motor speed below and above its base speed. Changing the rotation direction requires to change the pulses fed into the…

Explain the principle of operation, constructional features, and excitation Methods for DC MOTORS AND GENERATORS, Series, Shunt, and Compound