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The finger voltage of an SCR is
Answer: a Explanation: Finger voltage is the minimum value of Vak (anode to cathode voltage) to turn on the device with gate triggering, it is to be avoided for accidental turn-on of the device.
Answer: a Explanation: Finger voltage is the minimum value of Vak (anode to cathode voltage) to turn on the device with gate triggering, it is to be avoided for accidental turn-on of the device.
See lessThe forward dv/dt rating of an SCR
Answer: a Explanation: If the temperature is high, lesser dv/dt is required to turn on the device as the higher temperature has already excited few of the holes & electrons.
Answer: a Explanation: If the temperature is high, lesser dv/dt is required to turn on the device as the higher temperature has already excited few of the holes & electrons.
See lessThe voltage safety factor (VSF) for an SCR is the ratio of
Answer: c Explanation: It is peak repetitive reverse voltage/ the maximum value of input voltage(Vm).
Answer: c Explanation: It is peak repetitive reverse voltage/ the maximum value of input voltage(Vm).
See lessLatching current for an SCR is 100 mA, a dc source of 200 V is also connected to the SCR which is supplying an R-L load. Compute the minimum width of the gate pulse required to turn on the device. Take L = 0.2 H & R = 20 ohm both in series
Answer: b Explanation: E = Ri + L di/dt Solve the above D.E for I & substitute the above values. t = 100.503 μsec
Answer: b Explanation: E = Ri + L di/dt Solve the above D.E for I & substitute the above values. t = 100.503 μsec
See lessConsider the two transistor analogy of SCR, if α1 & if α2 are the common-base current gains of both the transistors then to turn-on the device
Answer: d Explanation: To turn on the device sum of both the current gains should approach unity value.
Answer: d Explanation: To turn on the device sum of both the current gains should approach unity value.
See lessFrom the two transistor (T1 & T2) analogy of SCR, the total anode current of SCR is ___________ in the equivalent circuit.
Answer: b Explanation: The sum of both the collector currents of T1 and T2 forms the total anode current of SCR. Refer the model.
Answer: b Explanation: The sum of both the collector currents of T1 and T2 forms the total anode current of SCR. Refer the model.
See lessThe gate-source voltage is Es = 16 V and the load line has a slope of 128 V/A. Calculate the gate current for an average gate power dissipation of 0.5 W.
Answer: a Explanation: Load line is nothing but Rs Es = 16V Vg.Ig = 0.5 Rs = 128 We have Es = Ig x Rs + Vg.
Answer: a Explanation: Load line is nothing but Rs Es = 16V Vg.Ig = 0.5 Rs = 128 We have Es = Ig x Rs + Vg.
See lessLatching current for an SCR is 100 mA, DC source of 200 V is also connected from the SCR to the L load. Compute the minimum width of the gate pulse required to turn on the device. Take L = 0.2 H.
Answer: b Explanation: For L load, E = L di/dt I = E/L t Therefore, 0.100 = 200t/0.2 T = 100 μsec.
Answer: b Explanation: For L load, E = L di/dt I = E/L t Therefore, 0.100 = 200t/0.2 T = 100 μsec.
See lessThe two transistor model of the SCR can obtained by
Answer: d Explanation: The two transistor model consists of p-n-p and n-p-n transistors, of which the middle n-p layer is common in both the transistors
Answer: d Explanation: The two transistor model consists of p-n-p and n-p-n transistors, of which the middle n-p layer is common in both the transistors
See lessFor an SCR, the gate-cathode characteristic has a slop of 130. The gate power dissipation is 0.5 watts. Find Ig
Answer: c Explanation: Vg/Ig = 130 .. (given) Vg.Ig = 0.5 watts .. (given) use both the given data & find the gate current
Answer: c Explanation: Vg/Ig = 130 .. (given) Vg.Ig = 0.5 watts .. (given) use both the given data & find the gate current
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