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The dv/dt protection is provided in order to
Answer: c Explanation: Accidentally some voltage spike or noise may occur in the vicinity of the device, if the magnitude is large enough it may turn on the SCR.
Answer: c Explanation: Accidentally some voltage spike or noise may occur in the vicinity of the device, if the magnitude is large enough it may turn on the SCR.
See lessThe local hot spot formation in the cross-section of the SCR is avoided by
Answer: b Explanation: Applying the higher gate current spreads the ions quickly and avoids hotspot formation
Answer: b Explanation: Applying the higher gate current spreads the ions quickly and avoids hotspot formation
See lessdi/dt protection is provided to the thryistor by
Answer: b Explanation: By placing the di/dt inductor (L) in series with the load, the change in the anode current can be limited to a small value.
Answer: b Explanation: By placing the di/dt inductor (L) in series with the load, the change in the anode current can be limited to a small value.
See lessThe thermal resistance between junction & the SCR (θjc) has the unit
Answer: c Explanation: Thermal resistance always has the unit degree temperature per watt.
Answer: c Explanation: Thermal resistance always has the unit degree temperature per watt.
See lessThe maximum rms current of an SCR is 50 A. For a 120° sine wave conduction the form factor (FF) = 1.878 Find the average on-state current rating (ITAV).
Answer: c Explanation: ITAV = 50/FF.
Answer: c Explanation: ITAV = 50/FF.
See lessThe amp2-sec rating of the SCR specifies
The energy that the device can absorb while operating in the forward blocking mode.
The energy that the device can absorb while operating in the forward blocking mode.
See lessFor an SCR the average & rms values of current are I/4 & I/2 respectively. Calculate the average on-state current rating (ITAV). Take maximum RMS on-state current = 35 A.
Answer: c Explanation: Form factor = RMS/Average vaules of current Therefore, FF = 2 ITAV = 35/2 = 17.5.
Answer: c Explanation: Form factor = RMS/Average vaules of current Therefore, FF = 2 ITAV = 35/2 = 17.5.
See lessFor a SCR the maximum rms on-state current is 35 A. If the SCR is used in a resistive circuit for a rectangular wave with conduction angle of 90°. Calculate the average & rms currents respectively
Answer: a Explanation: First convert the conduction angle into N for rectangular wave. N = 360°/Conduction angle = 4 Therefore, Iavg = I/4 Irms = I/√4 = I/2.
Answer: a Explanation: First convert the conduction angle into N for rectangular wave. N = 360°/Conduction angle = 4 Therefore, Iavg = I/4 Irms = I/√4 = I/2.
See lessAn SCR has half cycle surge current rating of 3000 A for 50 Hz. Calculate its one-cycle surge current rating
Answer: b Explanation: By equating the energies involved in one cycle & subcycle I2.T = Isb2.t Isb = 3000 A T = 1/50 t = T/2.
Answer: b Explanation: By equating the energies involved in one cycle & subcycle I2.T = Isb2.t Isb = 3000 A T = 1/50 t = T/2.
See lessWhich among the following anode current waveforms will have the minimum junction temperature?
Answer: b Explanation: N % DC is nothing but a wave with n % duty cycle. Lower the Duty cycle lesser is the current flowing & lesser is the temperature dissipation.
Answer: b Explanation: N % DC is nothing but a wave with n % duty cycle. Lower the Duty cycle lesser is the current flowing & lesser is the temperature dissipation.
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