GATE EE
Power Electronics
Single and Three Phase Rectifier
Previous Years Questions

## Marks 1

A single-phase full-bridge diode rectifier feeds a resistive load of 50 $$\Omega$$ from a 200 V, 50 Hz single phase AC supply. If the diodes are ideal...
The voltage at the input of an AC-DC rectifier is given by $$v(t) = 230\sqrt 2 \sin \omega t$$ where $$\omega = 2\pi \times 50$$ rad/s. The input cu...
For the ideal AC-DC rectifier circuit shown in the figure below, the load current magnitude is Idc = 15 A and is ripple free. The thyristors are fired...
The waveform of the current drawn by a semi-converter from a sinusoidal AC voltage source is shown in the figure. If I0 = 20 A, the rms value of funda...
A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. W...
In the circuit shown, the diodes are ideal, the inductance is small, and $${{\rm I}_0} \ne 0.$$ Which one of the following statements is true? ...
A phase-controlled, single-phase, full-bridge converter is fed from a $$230$$ $$V,$$ $$50$$ $$Hz,$$ $$AC$$ source. The fundamental frequency in $$Hz$$...
The figure below shows the circuit diagram of a controlled rectifier supplied from a $$230V,$$ $$50$$ $$Hz,$$ $$1$$-phase voltage source and a $$10:1... A half-controlled single-phase bridge rectifier is supplying an$$R$$-$$L$$load. It is operated at a firing angle$$α$$and the load current is conti... The fully controlled thyristor converter in the figure is fed from a single-phase source. When the firing angle is$${0^ \circ }$$, the$$dc$$output ... A single$$-$$phase fully controlled thyristor bridge$$ac-dc$$converter is operating at a firing angle of$${25^ \circ }$$and an overlap... A single phase full$$-$$wave half$$-$$controlled bridge converter feeds an inductive load. The two$$SCR's$$in the converter are connected to a c... A single$$-$$phase half wave uncontrolled converter circuit is shown in figure. A$$2$$-winding transformer is used at the input for isolation. Ass... A three - phase diode bridge rectifier is fed from a$$400VRMS$$.$$50Hz$$, three$$-$$phase$$AC$$source. If the load is purely resi... The circuit in figure shows a full-wave rectifier. The input voltage is$$230V(rms)$$single-phase ac. The peak reverse voltage across the d... The circuit in figure shows a$$3-$$phase half$$-$$wave rectifier. The source is a symmetrical,$$3-$$phase four$$-$$wire system. The ... A fully controlled natural commuted$$3$$-phase bridge rectifier is operating with a firing angle$$\alpha = {30^0}.$$The peak to peak voltage rippl... A six pulse thyristor rectifier bridge is connected to a balanced$$50Hz$$three phase$$ac$$source. Assuming that the$$dc$$output current of the r...$$AC$$to$$DC$$circulating current dual converters are operated with the following relationship between their triggering angles$$\left( {{\alpha _1...
A thyristorised three phase fully controlled converter feeds a $$dc$$ load that draws a constant current. Then the input $$ac$$ line current to the co...
Resonant Converter's are basically used to
In a dual converter, the circulating current
In a $$3$$ - phase controlled bridge rectifier, with an increase of overlap angle the output $$dc$$ voltage
A three phase $$ac$$-to-$$dc$$ diode bridge rectifier is supplied from a three-phase, $$440V$$ source. The rectifier supplies a purely resistive load....
A single phase diode bridge rectifier supplies a highly inductive load. The load current can be assumed to be ripple free. The ac supply side current ...
The output voltage of a six - pulse double star rectifier is the same as that of a three - phase half wave rectifier
Referring to the figure the type of load is ...
In the circuit shown in fig, $$L$$ is large and the average value of $$'i'$$ is $$100A.$$ The thyristor is gated in the half cycle of $$'e'$$ at a del...

## Marks 2

A phase controlled single phase rectifier, supplied by an AC source, feeds power to an R-L-E load as shown in the figure. The rectifier output voltage...
The figure below shows an uncontrolled diode bridge rectifier supplied form a $$220$$ Z$$V,$$ $$50$$ $$Hz,$$ $$1$$-phase $$ac$$ source. The load draws...
A full-bridge converter supplying an RLE load is shown in figure. The firing angle of the bridge converter is 120º. The supply voltage $${v_m}\left( ... A single-phase bi-directional voltage source converter (VSC) is shown in the figure below. All devices are ideal. It is used to charge a battery at 40... In the given rectifier, the delay angle of the thyristor$${T_1}$$measured from the positive going zero crossing of$${V_s}$$is$${30^ \circ }$$. If... A three-phase fully controlled bridge converter is fed through star-delta transformer as shown in the figure. The converter is operated at a firing ... A diode circuit feeds an ideal inductor as shown in the figure. Given$${V_s} = 100\,\,\sin \,\left( {\omega t} \right)V,$$where$$\omega = 100\pi $... A fully controlled converter bridge feeds a highly inductive load with ripple free load current. The input supply $$\left( {{V_s}} \right)$$ to the br... The figure shows the circuit diagram of a rectifier. The load consists of a resistance $$10\,\Omega$$ and an inductance $$0.05$$ $$H$$ connected in s... The input voltage given to a converter is $${V_i} = 100\sqrt 2 \,\,\,\sin \,\,\,\left( {100\pi t} \right)\,\,V$$ The current drawn by the converter i... The input voltage given to a converter is $${V_i} = 100\sqrt 2 \,\,\,\sin \,\,\,\left( {100\pi t} \right)\,\,V$$ The current drawn by the converter i... A solar energy installation utilize a three – phase bridge converter to feed energy into power system through a transformer of $$400V/400 V,$$ as show... A solar energy installation utilize a three – phase bridge converter to feed energy into power system through a transformer of $$400V/400 V,$$ as show... The circuit shows an ideal diode connected to a pure inductor and is connected to a purely sinusoidal $$50$$ $$Hz$$ voltage source. Under ideal condit... A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of $$10$$ $$A$$ at a firing angle of... A single phase full bridge converter supplies a load drawing constant and ripple free load current. If the triggering angle is $${30^ \circ },$$ the i... A single - phase half controlled converter shown in the figure feeding power to highly inductive load. The converter is operating at a firing angle of... A single phase fully controlled converter bridge is used for electrical braking of a separately excited $$dc$$ motor. The $$dc$$ motor load is represe... A single $$-$$ phase, $$230$$ $$V$$, $$50$$ $$Hz$$ $$ac$$ mains fed step down transformer $$(4:1)$$ is supplying power to a half $$-$$ wave uncontroll... In the circuit of adjacent figure the diode connects the $$ac$$ source to pure inductance $$L.$$ The diode conducts for ... A solar cell of $$350V$$ is feeding power to an $$ac$$ supply of $$440$$ $$V,$$ $$50$$ $$Hz$$ through a $$3$$- phase fully controlled briodge converte... A $$3$$ $$-$$ phase fully controlled bridge converter with free wheeling diode is fed from $$400$$ $$V$$, $$50$$ $$Hz$$ $$AC$$ source and is operating... A single - phase bridge converter is used to charge a battery of $$200$$ $$V$$ having an internal resistance of $$2\,\,\Omega$$ as shown in figure. T... Consider a phase $$-$$ controlled converter shown in figure The thyristor is fired at an angle $$\alpha$$ in every positive half cycle of the input v... A phase - controlled half - controlled single - phase converter is shown in figure. The control angle $$\alpha = {30^ \circ }$$ The output $$dc$$ ... A three phase thyristor bridge rectifier is used in a $$HVDC$$ link. The firing angle $$\alpha$$ (as measured from the point of natural commutation) ... In the single phase diode bridge rectifier shown in fig, the load resistor is $$R = 50\Omega .$$ The source voltage is $$V = 200sin\omega t,$$ Whe... A half-wave thyristor converter supplies a purely inductive load, as shown in figure. If the triggering angle of the thyristor is $${120^ \circ }$$, t... When the firing angle $$\alpha$$ of a single phase, fully controlled rectifier feeding constant $$d.c.$$ current into a load is $${30^ \circ }$$ , th... A $$3$$-phsae, fully controlled, converter is feeding power into a $$d.c.$$ load at a constant current of $$150A.$$ The $$r.m.s$$ current through each... ## Marks 5 A three phase diode bridge is used to provide rectified output from a $$400V,$$ $$50$$ $$Hz,$$ $$3$$- phase supply to a $$R$$ $$-$$ $$L$$ load with $$... An$$SCR$$is connected in series with a$$300Vac$$supply and a$$300$\$ ohms load resistor calculate (a) The reading of a moving coil ammeter co...
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