In reverse blocking mode of a thyristor______?
(A) junction J2 is in reverse bias and J1, J3 is in forward bias.
(B) junction J3 is in forward bias and J1, J2 in reverse bias.
(C) junction J1, J3 is in reverse bias and J2 is in forward bias.
(D) junction J1 and J2 is in forward bias and J3 is in reverse bias.
Which statement is true for latching current ___________?
(A) It is related to turn off process of the device.
(B) It is related to conduction process of device.
(C) It is related to turn on process of the device.
(D) Both C and
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is_____?
(A) 0.32
(B) 0.67
(C) 0.45
(D) 0.27
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 _____?
(A) 30° to 150°.
(B) 30° to 180°.
(C) 60° to 120°.
(D) 60° to 180°.
What is used to protect the SCR from over current ________________?
(A) CB and fuse.
(B) Heat sink.
(C) Snubber circuit.
(D) Voltage clamping devic
Under normal operating condition voltage clamping device offers impedance of_________?
(A) high value.
(B) low value.
(C) zero value.
(D) moderate valu
Under over voltage condition impedance offered by the voltage clamping device is__________?
(A) low
(B) High
(C) moderate
(D) infinity
The maximum di/dt in a SCR is____________?
(A) Directly proportional to supply voltage
(B) Directly proportional to inductance in the circuit
(C) Inversely proportional to supply voltage
(D) Both A and B