When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ___________?
(A) CB
(B) Snubber circuit
(C) Voltage clamping device
(D) Fast acting current limiting device (FACL fuse)
A power semiconductor may undergo damage due to____________?
(A) High di/dt
(B) High dv/dt
(C) Low di/dt
(D) Low dv/dt
CB used for over current protection of thyristor operates when the fault current is__________?
(A) of long period
(B) of short duration
(C) both (A) and (B)
(D) neither (A) nor (B)
If the anode current is 800 A, then the amount of current required to turn off the GTO is about____________?
(A) 20 A
(B) 200 A
(C) 600 A
(D) 400 A
Compared to transistor, _________ have lower on state conduction losses and higher power handling capability?
(A) TRIACs
(B) Semi conductor diodes
(C) MOSFETs
(D) Thyristor
Materials used in heat sink should have_____________?
(A) high thermal conductivity
(B) large surface area
(C) high melting point
(D) All of these
A thyristor can termed as__________?
(A) AC switch
(B) DC switch
(C) Both a and B
(D) Square wave switch
Which of the following is used in heat sink_____________?
(A) Iron
(B) Aluminium
(C) Carbon
(D) Silver
How can we protect SCR from thermal conditions _____________?
(A) Use of snubber circuit.
(B) Using heat sink.
(C) Using CB and fuse.
(D) Using equalizing circuit
Thyristor is nothing but a____________?
(A) Controlled transistor
(B) Controlled switch
(C) Amplifier with higher gain
(D) Amplifier with large current gain