A single-phase one-pulse controlled circuit supplies a load of resistance R and counter emf E from a source of 400 sin(314t) V. If the counter emf is 200 V, over what range can the firing angle be controlled?
Correct answer D. 30° to 150°
Explanation
The thyristor is forward biased only while 400 sin ωt exceeds 200 V. sin⁻¹(200/400) = 30°, so firing is possible from 30° to 180° − 30° = 150°.
Answer checked How we write and check questions
Discussion