Power Electronics
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

 60° to 120°.
 30° to 180°.
 60° to 180°.
 30° to 150°.

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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 OFF but not ON 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.

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