Q. In a fully controlled bridge converter feeding a resistive load the waveshapes of output voltage and output current

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Q. Assertion (A): A GTO circuit is more compact than SCR circuit

Reason (R): A GTO can be turned off by negative gate pulse.

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Q. In a single phase full wave ac regulator, the firing angles in the two half cycles

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Q. As regards single phase dual converter

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Q. In a semi converter feeding a resistive load, the firing angle is α. Each thyristor conducts for

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Q. Between which points does UJT exhibit negative resistance characteristics

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Q. A thyristor has maximum allowable junction temperature of 110° C and the ambient temperature is 40°C, If the maximum internal power dissipation is 50 W, the thermal resistance is

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Q. A single phase electric heater uses phase controlled thyristors. The firing angle is 90°. The degree of heating is

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Q. Which of these commutation methods is used in AC-DC converters?

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Q. In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is

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Q. A high frequency series inverter consists of

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Q. In an SCR, the anode current consists of

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Q. A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load

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Q. A chopper cannot be line commutated.

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Q. Natural commutation can be used in :

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Q. In a thyristor the gate lead is connected to the n layer near the p layer to which anode is connected.

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Q. A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if

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Q. McMurray Bedford full bridge inverter uses

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Q. A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then

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Q. Which of the following devices exhibit negative resistance characteristics?

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