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82.At turn-on the initial delay or turn on delay is the time required for the a) input inductance to charge to the threshold value b) input capacitance to charge to the threshold value c) input inductance to discharge to the threshold value d) input capacitance to discharge to the threshold value
Answer: c
Answer: c
See less166. For 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. a) I/4, I/2 b) I/2, I/√2 c) I/4, I2 /2 d) I/4, I/√2
Answer: c
Answer: c
143. The minimum value of anode current below which it must fall to completely turn-off the device is called as the a) holding current value b) latching current value c) switching current value d) peak anode current value
Answer a
Answer a
See less131. The forward break over voltage is the a) anode-cathode voltage at which conduction starts with gate signal applied b) anode-cathode voltage at which conduction starts with no gate signal applied c) gate voltage at which conduction starts with no anode-cathode voltage d) gate voltage at which conduction starts with anode-cathode voltage applie
Answer b
Answer b
See less130. For an SCR in the forward blocking mode (practically) a) leakage current does not flow b) leakage current flows from anode to cathode c) leakage current flows from cathode to anode d) leakage current flows from gate to anode
Answer c
Answer c
See less129. With the anode positive with respect to the cathode & the gate circuit open, the SCR is said to be in the a) reverse blocking mode b) reverse conduction mode c) forward blocking mode d) forward conduction mode
Answer c
Answer c
See less128. For an SCR in the reverse blocking mode, (practically) a) leakage current does not flow b) leakage current flows from anode to cathode c) leakage current flows from cathode to anode d) leakage current flows from gate to anode
Answer: c
Answer: c
See less127. If the cathode of an SCR is made positive with respect to the anode & no gate current is applied then a) all the junctions are reversed biased b) all the junctions are forward biased c) only the middle junction is forward biased d) only the middle junction is reversed biased
Answer b
Answer b
See less126. The static V-I curve for the SCR is plotted for a) Ia (anode current) vs Ig (gate current), Va (anode – cathode voltage) as a parameter b) Ia vs Va with Ig as a parameter c) Va vs Ig with Ia as a parameter d) Ig vs Vg with Ia as a parameter
Answer b hu
Answer b hu
See less122. Which terminal does not belong to the SCR? a) Anode b) Gate c) Base d) Cathode
Answer c
Answer c