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125. In the SCR structure the gate terminal is located a) near the anode terminal b) near the cathode terminal c) in between the anode & cathode terminal d) none of the mentioned
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
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.
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 Explanation: The curve is plotted for Ia vs Va for different values of gate current Ig.
Answer: b
Explanation: The curve is plotted for Ia vs Va for different values of gate current Ig.
See less121. A thyristor (SCR) is a a) P-N-P device b) N-P-N device c) P-N-P-N device d) P-N device
Answer: c Explanation: An SCR (silicon controlled rectifier) is a four layer p-n-p-n type device.
Answer: c
Explanation: An SCR (silicon controlled rectifier) is a four layer p-n-p-n type device.
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: c Explanation: The device is in the reverse blocking state (3rd quadrant) & only the middle junction is forward biased whereas other two are reversed biased.
Answer: c
Explanation: The device is in the reverse blocking state (3rd quadrant) & only the middle
junction is forward biased whereas other two are reversed biased.
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 Explanation: In the reverse blocking mode, the gate current is zero & a reverse voltage is applied at the cathode-anode.
Answer: c
Explanation: In the reverse blocking mode, the gate current is zero & a reverse voltage
is applied at the cathode-anode.
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 Explanation: The SCR is in the forward blocking mode with its top and bottom junctions forward biased and the middle junction reversed biased.
Answer: c
Explanation: The SCR is in the forward blocking mode with its top and bottom junctions
forward biased and the middle junction reversed biased.
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: b Explanation: In the forward blocking mode, the gate current is zero & only the middle J2 junction is reversed biased.
Answer: b
Explanation: In the forward blocking mode, the gate current is zero & only the middle J2
junction is reversed biased.
See less124. Choose the false statement. a) SCR is a bidirectional device b) SCR is a controlled device c) In SCR the gate is the controlling terminal d) SCR are used for high-power applications
Answer: a Explanation: It is a unidirectional device, current only flows from anode to cathode
Answer: a
Explanation: It is a unidirectional device, current only flows from anode to cathode
See less123. An SCR is a a) four layer, four junction device b) four layer, three junction device c) four layer, two junction device d) three layer, single junction device
Answer: b Explanation: SCR is a four layer p-n-p-n device which forms three p-n junctions.
Answer: b
Explanation: SCR is a four layer p-n-p-n device which forms three p-n junctions.
See less122. Which terminal does not belong to the SCR? a) Anode b) Gate c) Base d) Cathode
Answer: c Explanation: The SCR is having three terminals viz. anode, cathode and the gate.
Answer: c
Explanation: The SCR is having three terminals viz. anode, cathode and the gate.
See less