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Higher the magnitude of the gate pulse
Higher the magnitude of the gate pulse a) lesser is the time required to inject the charges b) greater is the time required to inject the charges c) greater is the value of anode current d) lesser is the value of anode current
Higher the magnitude of the gate pulse a) lesser is the time required to inject the charges b) greater is the time required to inject the charges c) greater is the value of anode current d) lesser is the value of anode current
See lessA tangent drawn from the Y-axis to the Pavg on the gate characteristics gives the value of the
Answer: b Explanation: It gives the min gate to source resistance.
Answer: b Explanation: It gives the min gate to source resistance.
See lessThe area under the curve of the gate characteristics of thyristor gives the
Answer: d Explanation: As the gate characteristics is a plot of Ig vs Vg consisting of two curves one for the maximum values & other for the minimum the area between them gives the total average gate power dissipation. (A very important parameter in designing of the triggering circuits).
Answer: d Explanation: As the gate characteristics is a plot of Ig vs Vg consisting of two curves one for the maximum values & other for the minimum the area between them gives the total average gate power dissipation. (A very important parameter in designing of the triggering circuits).
See lessThe gate characteristics of thyristor is a plot of
Answer: b Explanation: It is the gate current versus the gate voltage plot and gives the minimum and maximum values of gate parameters.
Answer: b Explanation: It is the gate current versus the gate voltage plot and gives the minimum and maximum values of gate parameters.
See lessTo avoid commutation failure
Answer: a Explanation: If the thyristor turn off time is more than the circuit turn off time, the circuit will be turned off and the thyristor will keep conducting, which is not at all desirable.
Answer: a Explanation: If the thyristor turn off time is more than the circuit turn off time, the circuit will be turned off and the thyristor will keep conducting, which is not at all desirable.
See lessFor effective turning off of the SCR after the anode current has reached zero value, ______________
Answer: b Explanation: To enable the device to regain its reverse blocking capabilities, the stored charges in the junctions of the SCR must be removed
Answer: b Explanation: To enable the device to regain its reverse blocking capabilities, the stored charges in the junctions of the SCR must be removed
See lessFor an SCR the total turn-on time consists of i) Delay time ii) Rise time and the iii) Spread time The spread time interval depends upon
Answer: c Explanation: During the spread time the conduction starts spreading all over the SCR cathode cross-section structure, which depends upon the structure of the gate & cathode. Higher the cathode area more is the time required for the charges to spread all over.
Answer: c Explanation: During the spread time the conduction starts spreading all over the SCR cathode cross-section structure, which depends upon the structure of the gate & cathode. Higher the cathode area more is the time required for the charges to spread all over.
See lessThe latching current is _________ than the holding current
Answer: b Explanation: The latching current is the value of current on which the device will remain in the on state even after removal of the gate signal. Whereas, the holding current is the threshold above which the device will work.
Answer: b Explanation: The latching current is the value of current on which the device will remain in the on state even after removal of the gate signal. Whereas, the holding current is the threshold above which the device will work.
See lessFor an SCR the total turn-on time consists of i) Delay time ii) Rise time and iii) Spread time During the rise time the
Answer: c Explanation: The losses are maximum during the rise time because both Ia & Va are high.
Answer: c Explanation: The losses are maximum during the rise time because both Ia & Va are high.
See lessThe minimum value of anode current below which it must fall to completely turn-off the device is called as the
Answer: a Explanation: The device will remain in the conducting state unless the anode current falls below the holding current value.
Answer: a Explanation: The device will remain in the conducting state unless the anode current falls below the holding current value.
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