FEEDBACK AND CONTROL SYSTEMS ACTIVITY NO.4 1. Design the circuit ON-OFF Push button switch using SCR device with driven Electromagnetic relay switch, with a load of DC motor 12 V. and connected to N.O contact switch.
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- A 240 V, 50Hz single phase supply feeds a SP-FC-FWR. The rectifier is used to power the armature of a separately excited DC motor. The DC motor ratings are 220 V, 10 A (armature current), 940 rpm, Ra= 1.750. What is the no-load speed of the motor?15. What is the relationship of the gate pulses to the two thyristors in a full-wave ac phase control circuit? 16. A buck chopper is powered by a 200-V dc power supply. What is the output voltage range of this chopper if the duty cycle can be varied between 30 and 95%?Discuss about Power Thyristor's DC and Ac switching.(with Diagram)
- 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.A 3-phase half wave controlled AC to DC converter is supplied from a 250V, supply. Assume the thyristor voltage drop to be 1.6V and the load current to be continuous. Evaluate the mean output voltage when firing angle is varied at 45(degree) , 60(degree) and 90(degree)A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.20 V/rpm. The armature current is 6 A without any ripple. The armature resistance is 2 ohm. The converter is working from a 230 V, single phase ac source with a firing angle of 30°. Under this operating condition determine the speed of the motor.
- a) Figure 3 illustrates a thyristor phase control circuit and associated waveforms. Describe the function of the control element in the circuit towards the output at the load. Identify the best-suited application to describe the control circuit. Lamp Load VAC SCR r 9 8₁ Conduction MM h 18₂ h Gate Trigger PulseThe resultant DC signal from a half-wave rectifier circuit was investigated, the following trace was observed on the oscilloscope: RIGOL T'D f 0 -80.0mV CH2 500MV Time 5.000ms T+0.0000s The trace has a slight ripple in its structure. This ripple can be attributed toExplain the operation of Negative clamping with circuit diagram and waveforms.
- What is the difference between a single-phase full-wave Half control and a single-phase Half-wave full control ?3. A three phase bridge rectifier is supplied by 380 Volt line voltage through a Star/delta connected transformer of which turns ratio is 1. The firing delay angle is a=30° and the load is resistive R=2.2 Ohm. Draw the circuit diagram and mark the followings on this figure : average values of output voltage, the currents and voltages of each transformer leg.Compute the dc load current of a SCR full-wave control circuit if the firing angle is 36 degree. Assume resistive load R₁ = 10 ohms with supply of 220V, 60Hz. A. 6A B. 9A C. 13A D. 18A