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The forward break over voltage is maximum when
Answer: b Explanation: Higher the value of anode-cathode forward voltage, lower the gate requirements of the device.
Answer: b
See lessExplanation: Higher the value of anode-cathode forward voltage, lower the gate
requirements of the device.
Among the following, the most suitable method to turn on the SCR device is the
Answer: a Explanation: d) & b) are unreliable methods, c) can permanently damage the SCR Gate triggering is simple, reliable & most efficient.
Answer: a
See lessExplanation: d) & b) are unreliable methods, c) can permanently damage the SCR
Gate triggering is simple, reliable & most efficient.
Usually the forward voltage triggering method is not used to turn-on the SCR because
Answer: c Explanation: In forward voltage triggering the middle junction breaks down without any gate signal and pushes the device into the conducting state. This method can permanently damage the J2 junction and make the device useless.
Answer: c
See lessExplanation: In forward voltage triggering the middle junction breaks down without any
gate signal and pushes the device into the conducting state. This method can
permanently damage the J2 junction and make the device useless.
A thyristor can be bought from the forward conduction mode to forward blocking mode by
Answer: d Explanation: a) & c) are used to turn on the device, b) will damage the SCR.
Answer: d
See lessExplanation: a) & c) are used to turn on the device, b) will damage the SCR.
For a forward conducting SCR device, as the forward anode to cathode voltage is increased
Answer: b Explanation: Higher the value of anode-cathode forward voltage, lower the gate requirements of the device. Also, the forward resistance of the device is always constant as long as the junction temperature is constant.
Answer: b
See lessExplanation: Higher the value of anode-cathode forward voltage, lower the gate
requirements of the device. Also, the forward resistance of the device is always constant
as long as the junction temperature is constant.
The forward break over voltage is the
Answer: b Explanation: It is the forward voltage at which the middle junction breaks down without any gate signal and pushes the device into the conducting state
Answer: b
See lessExplanation: It is the forward voltage at which the middle junction breaks down without
any gate signal and pushes the device into the conducting state
For an SCR in the forward blocking mode (practically)
Answer: b Explanation: In the forward blocking mode, the gate current is zero & only the middle J2 junction is reversed biased.
Answer: b
See lessExplanation: In the forward blocking mode, the gate current is zero & only the middle J2
junction is reversed biased.
For an SCR in the reverse blocking mode, (practically)
Answer: c Explanation: In the reverse blocking mode, the gate current is zero & a reverse voltage is applied at the cathode-anode.
Answer: c
See lessExplanation: In the reverse blocking mode, the gate current is zero & a reverse voltage
is applied at the cathode-anode.
The static V-I curve for the SCR is plotted for
Answer: b Explanation: The curve is plotted for Ia vs Va for different values of gate current Ig.
Answer: b
See lessExplanation: The curve is plotted for Ia vs Va for different values of gate current Ig.
In the SCR structure the gate terminal is located
Answer: b Explanation: The gate is located near the cathode, because it allows fast turning on of the device when the gate signal is applied by forward basing the second junction.
Answer: b
See lessExplanation: The gate is located near the cathode, because it allows fast turning on of
the device when the gate signal is applied by forward basing the second junction.