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In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.
A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if
Assertion (A): The turn on time of SCR is about 1 to 4 ms.
Reason (R): The turn off time of SCR is about 10 to 300 ms.
An n pulse rectifier is fed by a source having an inductance L. If load current is I0, the voltage drop due to overlap is
Which chopper circuit operates in all the 4 quadrants?
A single phase cycloconverter feeds a resistance heating load. The heating power is provided by
A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ωt. The firing angle is a. The dc output voltage is
Which of these commutation methods uses an external pulse for commutation?
In a single phase full wave regulator feeding an R-L load, the power factor angle of load is θ. The range of control of firing angle a is
A separately excited dc motor is run from a dc source through a chopper. At 600 rpm and rated torque, the duty cycle of chopper is 0.8. At 600 rpm and half the rated torque, the duty cycle is likely to be
In a 3 phase bridge inverter with 180º mode of operation the numbers of thyristors conducting at one time are
In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
In the circuit of figure, the load current when thyristor is off
A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
In brushless excitation system of modern alternators, the main exciter is
The two-transistor model of a thyristor consists of two transistors :
In a 3 phase full converter, the firing angle is less than 60º. The instantaneous output voltage
5 videos|50 docs|46 tests
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5 videos|50 docs|46 tests
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