Power Electronics Under normal operating condition voltage clamping device offers impedance of low value. zero value. high value. moderate value. low value. zero value. high value. moderate value. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics After proper turn on of thyristor None of these gate signal must be removed. gate signal should present but can be removed. gate signal is always present. None of these gate signal must be removed. gate signal should present but can be removed. gate signal is always present. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ? 0.3 ohm 3.0 ohm 0.03 ohm 0.3 ohm 0.3 ohm 3.0 ohm 0.03 ohm 0.3 ohm ANSWER DOWNLOAD EXAMIANS APP
Power Electronics A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be 5, 7. 6, 4. 4, 6. 7, 5. 5, 7. 6, 4. 4, 6. 7, 5. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Example of a voltage clamping device metal oxide varistor. aluminium block. fast acting fuse. snubber circuit. metal oxide varistor. aluminium block. fast acting fuse. snubber circuit. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics An SCR is considered to be a semi controlled device because it can be turned ON but not OFF with a gate pulse. it can be turned ON only during one half cycle of an AC. it can be turned OFF but not ON with a gate pulse. it conducts only during one half cycle of an alternating current wave. it can be turned ON but not OFF with a gate pulse. it can be turned ON only during one half cycle of an AC. it can be turned OFF but not ON with a gate pulse. it conducts only during one half cycle of an alternating current wave. ANSWER DOWNLOAD EXAMIANS APP
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