183. An SCR can withstand a maximum junction temperature of 120?C with an ambient temperature of 75?C, If the SCR has thermal resistance from junction to ambient as 1.5?C/W, the maximum internal power dissipation allowed is
184. A single-phase half-wave controlled rectifier has 400 sin 314 t as the input voltage and R as the load. For the firing angle of 600 for the SCR, the average output voltage is
185. A single-phase, one-pulse controlled circuit has resistance and counter emf load and 400 sin 314t as the source voltage. For a load counter emt of 200 V, the range of firing angle control is
187. In a commutation circuit employed to turn off an SCR, satisfactory turn-off is obtained when
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