The breadth factor for 3rd harmonic emf of a 3 phase, 4 pole, synchronous machine having 36 stator slots is?
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- Q3/ A/ Compare between de series and shunt generator. Q3/ B/ Briefly explain the commutating process in dc machine.Two identical 3-phase, 500-V induction machines are mechanically coupled for a back-to-back test. One machine is motoring from a 500-V, 50-Hz supply and the other is generating on to a 3-phase, 500-V synchronous machine for which the fre- quency can be controlled. It is required to run the motoring induction mạchine at 40 hp. Neglecting the slight change in the generating machine parameters due to oper- ating at a reduced frequency, estimate the rating of the synchronous machine for this duty and the frequency at which it must be run. Line input readings for each machine No load 500 V 8.5 A 1-6 kW Locked rotor 100 V 30 A 1-6 kW Friction and windage loss per machine 0-8 kW. R = R2'[4] The half wave ac controller has rms output voltage equal to input rms Vs at.......... (5] In single phase bidirectional ac controller, the RMS output voltage can be varied between zero to.............. of input voltage
- Explain the DC Machine losses in briefly.If the number of slots per pole in a synchronous machine is 15 and each coil spans 7 slot pitches, Pitch factor for the machine is ............A hybrid stepper motor is shown in Figure Q2(b). Demonstrate how the windings of the stepper motor are excited in wave drive mode to rotate the rotor 4 steps in the counterclockwise direction. Assume that Figure Q2(b) shows the starting position (to) of the stepper motor before the windings are excited. The first step (41) is given in Table Q2(b). (Note: Transfer Table Q2(b) to the answer script; tick the correct cells in the table to show the winding excitation sequence.) (b) Table Q2(b) Clock cycle Stator pole North pole South pole i (s) t2 (s) Al A2 B1 B2 Al A2 B1 B2 Clock eyele в (s) A2 14 (s) Stator pole North pole South pole AI B1 B2 Al A2 B1 B2 stator A1 AL armature N shaft PM armature 1- amature 2 armature 2 A A2 Figure Q2(b)
- 1) P.f of inductive load is corrected by connecting . . across it. .... ...... 2) Open circuit test measures . losses. 3) The output variables of a motor are and ........ ... .... 4) For a motor output power is given by ...... 5) Flux control, voltage control, and armature control are three methods for ....... of dc motor. 6) A transformer takes 100V at primary and gives 50V at secondary, its turn ratio equals 7) The given set of equations represents . . Ea – laRa = Vr , la = IL , %3D Rf 8) The given set of equations represents. la = !, + IL, VT Rf Ea – laRa = Vr , 9) The given set of equations represents . Ea – laRa – IseRse = Vr, la = Ise = l, %3D | 10). .. has more initial torque than shunt dc motor.A shunt Generator terminal voltage is 243.5 V and the load current is 4.5 Amps. Its Armature resistance is 1.1 Ohms. What is the Generated emf of the DC Generator, consider the shunt field current as 0 Amps?Q6/ Answer the following questions: 1. Define the DC motor drive 2. Classify the DC motor drive 3. How can be controlling on the speed of DC motor 4. Numerate the types of AC-DC converter 5. Draw the circuit of single -phase converter on separately excited DC motor 6. Write the equations the following: I. Speed(W)= II. Torque developed(Td): III. Vm=..
- A single phase Half wave AC voltage controller has a resistive load of 16 ohms with input supply voltage of 240 V, 50 Hz. The delay angle of the thyristors is, a = 21/5. Determine a) The rms output voltage and current. b) Input power factor and Input current. c) Average output voltage and current.V. List the different types of stray load losses in an induction motor.Two DC generators, each with armature resistance of 0.02 ohm and fieldresistance of 50 ohms run in parallel and supply a total current of 1000 amperesto the load circuit. If their emfs are 270 V and 265 V, their bus bar voltagewill be. [Ans. 267.5 V]