In a voltage commutated SCR, the main SCR is commutated by – McqOptions

MCQOPTIONS

1.	In a voltage commutated SCR, the main SCR is commutated by
A.	triggering the auxiliary SCR
B.	sending a negative pulse to the main SCR
C.	removing the supply Vs
D.	none of the mentioned
Answer» B. sending a negative pulse to the main SCR

Discussion

No Comment Found

Related MCQs

A step-down chopper is also called as a
A voltage commutated chopper has the following parameters:Vs = 220 V. Commutation circuit: L = 20 μH and C = 50 μF.Find the effective on period for a constant load current of 80 A and Ton = 800 μsecs.
In a type C chopper, if only one switch is operated
Find the expression for effective input resistance of a step down chopper. With R load and duty cycle = α.
Which of the following mentioned control strategy/strategies would require a feedback loop?
For a type D chopper, if duty cycle α < 0.5 then the
The speed of a separately excited dc motor is controlled below base speed by using a type-A SCR based chopper. The supply voltage is 220 V dc and the armature resistance is 0.5 Ω. Calculate the minimum value of firing angle if the motor drives a constant torque load requiring an average armature current of 30 A.
The AC ripple voltage is given by
Find the expression for output voltage for a step-up chopper, assume linear variation of load current and α as the duty cycle.
The expression for the thyristor (chopper switch) current is given byI = (α2.Vs - αE)/RFind the value of firing angle α, for which the thyristor current is maximum.