SCR Characteristics MCQs

Practice SCR Characteristics MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Power ElectronicsSCR Characteristics

In the forward-blocking region of an SCR, the device is forward biased but remains OFF until?

AIt is triggered or forward breakover is reached
BThe anode becomes negative
CThe load current becomes zero only
DThe cathode is disconnected

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Correct Answer: A. It is triggered or forward breakover is reached

Explanation: In forward blocking, an SCR supports positive anode-to-cathode voltage until gate triggering or breakover initiates regenerative turn-on.

Reference: Standard power electronics: scr characteristics

Question 2

Power ElectronicsSCR Characteristics

The forward breakover voltage of an SCR is the anode-to-cathode voltage at which it turns ON without?

AA gate signal
BAn anode supply
CA cathode connection
DForward bias

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Correct Answer: A. A gate signal

Explanation: If forward voltage reaches the breakover level, an SCR can switch into conduction even without a gate trigger.

Reference: Standard power electronics: scr characteristics

Question 3

Power ElectronicsSCR Characteristics

Increasing the gate current of an SCR generally causes its forward breakover voltage to?

ADecrease
BIncrease without limit
CRemain exactly unchanged
DBecome negative

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Correct Answer: A. Decrease

Explanation: Greater gate drive assists regenerative turn-on, so less anode-to-cathode voltage is required to trigger the SCR.

Reference: Standard power electronics: scr characteristics