Type-D chopper fed Separately excited D.C motor drive can be operated with O Both Quadrant (I) & (II) O Quadrant (II ) only O Both Quadrant (I) & (IV) O Quadrant (1 ) only
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- - In d.c. generators armature reaction is produced by armature current O none of the mentioned compensating winding current field current O commutating winding current The use of d.c. generators elminated the use of rectifiers and ac supplies True False s If the number of layerallot is 4 then the number of colls the number of slots Equal to O none of the mentioned O twice O half O s In 2-pole machines: the wave winding have greater generated voltage than the lap winding'armatures True False For high rotating speed machines the number of poles munt be Little Tiue O Fale O O OThe excitation circuit of a free-excited DC motor is a single-phase full- wave uncontrolled rectifier and The armature circuit is fed with a single-phase full-wave controlled rectifier. both rectifiers for AC voltage voltage 220 V(rms) ,is 50 Hz. Excitation O resistance of motor Rf = 100, armature force resistance Ra = 2 0 and motor voltage constant Kv = 0.25 V/(A - r/s). The motor is a fixed 10Nm buy under load a) Draw the driver (converter-motor) power circuit. To rotate with 1200 d/d of the motor, b) Calculate the thyristor assembly. c) When the engine is heavily loaded, with a suitable probability value for supply voltage, armature voltage, armature flow wavelengths draw below. d) Calculate the motor power (total input power). (Note: Va = IaRa + ea, Vf = IfRf, ea = Kv Ifw and Te = Kv Ifla)A three-phase half wave-controlled rectifier circuit is shown in the figure. It is operated from 3- star connected, supply transformer with a line to line ac supply voltage of 440 volts rms at 50 Hz. The thyristor are triggered at a delay angle of a = 30°. Assume continuous ripple free current. The average output current (in A) is Ro Yo Во No T₂ + Voc ∙Iac Load
- Problem') A single-phase full-wave AC/AC voltage controller has input rms voltage Vs - 220 V,50 Hz, load R 100 2, and the firing angle a= 60° for the thyristors T1 and T2. Determine the output rms voltage VO and current IO, and the DPF.d) A 200V, 875rpm, 150 Amp separately exited D.C. motor has an armature resistance of 0.0652. It is fed from a single phase fully controlled rectifier with an a.c. source of 220V, 50Hz. Assuming continuous conductors find i) Firing angle for rated torque and 750 rpm ii) Motor speed for a = 160° and rated torque.A 120 Vp is applied to the primary coil of a center-tap transformer of turn ratio (n1 : n2 = 6: 2) . If the secondary coils are connected to a Ge diodes center-tap full wave rectifier, the output DC voltage is about __________. *1- 13.42 V2- 14.15 V3- 15.58 V4-12.54 V5- 16.23 V
- Subject Linear ControlPlease i only need answer for MCQ.A de machine is controlled by the step-down de-de converter shown below. The armature inductance La =0.2 mH and the armature resistance can be neglected. The armature current is 5A. The Buck converter is operating at the switching frequency is 30 kHz and the duty ratio is 0.8. L₁ + Answer the following questions: 1) Calculate the input voltage (Va) if the output voltage (ea = 200 V). 2) Find the ripple in the armature current (a). 3) Calculate the maximum and minimum values of the armature current (la). 4) Sketch the armature current (ia (t)) and the supply current (id (t)).A single phase half-wave AC voltage controller provides output RMS voltage of 50V when the triggering angle (a) is 90°. For the same a, what is the output RMS voltage if the AC voltage controller changed to full-wave type.
- Mono stable Multivabrator has unstable state ? Explain brieflyComparing the performance with controlled rectifier circuit which one of the following statement is correct for DC -DC chopper ? O a. Regenerative braking process is very slow O b. Efficiency is poor in chopper circuit O c. small filters are required O d. Switching frequency is not responsible for output ripplesSubject-power electronic Define A.Delay time B.Rise time C.reverse recovery voltage D.spread time.