Power Electronics Objective Questions
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An SCR is considered to be a semi controlled device because
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The typical value of SCR for modern alternator is
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SCR will be turned off when anode current is
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A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is
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A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is
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Under over voltage condition impedance offered by the voltage clamping device is
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In forward blocking mode of a thyristor
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The latching current of SCR is 20 mA. Its holding current will be
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A single phase full bridge inverter can operated in load commutation mode in case load consist of
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If holding current of a thyristor is 2 mA then latching current should be
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When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?
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Practical way of obtaining static voltage equalization in series connected SCRs is by the use of
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In a P1N1P2N2 thyristor which layer is less doped ?
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Which statement is true for latching current ?
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Under normal operating condition voltage clamping device offers impedance of
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The function of snubber circuit connected across the SCR is to
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What is used to protect the SCR from over current ?
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Switching frequency of SITH is
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Which triggering is the most reliable?
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Thyristor can be protected from over voltages by using
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After proper turn on of thyristor
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Light triggering mainly used in
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Example of a voltage clamping device
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CB used for over current protection of thyristor operates when the fault current is
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An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be
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In reverse blocking mode of a thyristor
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A single phase full bridge inverter can operate in load commutation mode in case load consists of
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Gate circuit or triggering circuit of a thyristor is
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Leakage current flows through the thyristor in
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The latching current of GTO should be of order
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