Power Electronics An SCR is considered to be a semi controlled device because it can be turned OFF but not ON with a gate pulse. 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 conducts only during one half cycle of an alternating current wave. it can be turned OFF but not ON with a gate pulse. 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 conducts only during one half cycle of an alternating current wave. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is 135 μs. 140 μs. 130 μs. 145 μs. 135 μs. 140 μs. 130 μs. 145 μs. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics After peak point, the UJT operates in the ___________ region. Saturation Negative resistance Cut-off None of these Saturation Negative resistance Cut-off None of these ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Rise time is defined by the interval when anode current rises 10 % to 90 % of its final value. anode voltage drops from 90 % to 10 % of its initial value. gate current rises from 90 % to 100 % of it final value. both B and C. anode current rises 10 % to 90 % of its final value. anode voltage drops from 90 % to 10 % of its initial value. gate current rises from 90 % to 100 % of it final value. both B and C. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics 60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is 91.6 %. 90.9 %. 83.3 %. 76.3 %. 91.6 %. 90.9 %. 83.3 %. 76.3 %. ANSWER DOWNLOAD EXAMIANS APP
Power Electronics Materials used in heat sink should have large surface area. All of these. high thermal conductivity. high melting point. large surface area. All of these. high thermal conductivity. high melting point. ANSWER DOWNLOAD EXAMIANS APP
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