Example of a voltage clamping device______________?
(A) fast acting fuse
(B) snubber circuit
(C) metal oxide varistor
(D) aluminium block
Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?
(A) One resistor across the string
(B) Resistors of the same value across each SCR
(C) Resistors of different values across each SCR
(D) One resistor in series with each SCR
Thyristor can be protected from over voltages by using____________?
(A) voltage clamping device.
(B) fuse.
(C) heat sink.
(D) snubber circuit.
BCT is used for____________?
(A) High power phase control
(B) High power current control
(C) Low power current control
(D) Low power phase control
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
(A) Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
(B) Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
(C) Vc1 = Vc2 = Vc3 any value of Ig.
(D) Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil
Which triggering is the most reliable____________?
(A) Forward voltage triggering
(B) Gate triggering
(C) dV / dt triggering
(D) Thermal triggering
Leakage current flows through the thyristor in_________?
(A) forward blocking mode
(B) reverse blocking mode
(C) both forward and reverse blocking mode
(D) forward conduction mode
Which of the following is disadvantage of fast recovery diodes?
(A) Recovery is only 5 µs
(B) Recovery is only 50 µs
(C) Doping is carried out
(D) None of these