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SCR MCQs

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

Question 2
Power ElectronicsSCR

The minimum anode current needed immediately after triggering so that an SCR remains ON when the gate pulse is removed is called?

  • ALatching current
  • BReverse leakage current
  • CDisplacement current
  • DLoad current rating
Report an error
Correct Answer: A. Latching current
Explanation: Latching current is the minimum anode current required to establish regenerative conduction after the triggering signal is removed.
Reference: Standard power electronics: scr
Question 3
Power ElectronicsSCR

For an SCR, the latching current is generally?

  • AGreater than the holding current
  • BLess than the holding current in every device
  • CExactly zero
  • DAlways equal to gate current
Report an error
Correct Answer: A. Greater than the holding current
Explanation: Typically the latching current is higher than the holding current because stronger current is required just after turn-on to establish conduction.
Reference: Standard power electronics: scr
Question 4
Power ElectronicsSCR

SCR stands for?

  • ASilicon Controlled Rectifier
  • BSeries Current Regulator
  • CSwitching Capacitor Rectifier
  • DSilicon Current Resistor
Report an error
Correct Answer: A. Silicon Controlled Rectifier
Explanation: SCR is the standard abbreviation for Silicon Controlled Rectifier, a thyristor device.
Reference: Standard power electronics: scr
Question 6
Power ElectronicsSCR

The three terminals of an SCR are?

  • AAnode, cathode and gate
  • BCollector, base and emitter
  • CDrain, source and gate
  • DAnode, base and drain
Report an error
Correct Answer: A. Anode, cathode and gate
Explanation: The terminals of an SCR are anode (A), cathode (K) and gate (G).
Reference: Standard power electronics: scr
Question 7
Power ElectronicsSCR

For normal forward turn-on of an SCR by gate triggering, the anode should be?

  • APositive with respect to cathode
  • BNegative with respect to cathode
  • CAt exactly zero potential in every case
  • DDisconnected from the supply
Report an error
Correct Answer: A. Positive with respect to cathode
Explanation: For forward blocking and gate-triggered turn-on, the anode is positive relative to the cathode.
Reference: Standard power electronics: scr
Question 8
Power ElectronicsSCR

Once a conventional SCR has latched ON, removal of the gate signal normally?

  • ADoes not turn it OFF
  • BImmediately turns it OFF
  • CReverses its anode current
  • DMakes its holding current infinite
Report an error
Correct Answer: A. Does not turn it OFF
Explanation: After latching, the gate loses control over turn-off; anode current must be reduced below the holding current or reverse voltage applied.
Reference: Standard power electronics: scr