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mediumMCQPYQs Based test 24: Power ElectronicsElectrical Engineering
1 mark (−0.33)

Figure shows 4 electronic switches (i), (ii), (iii) and (iv). Which of the switches can blockVoltages of either polarity(applied between terminals ‘a’ and ‘b’) when the active device is in OFF state?

image

  1. A
    (i), (ii) and (iii)
  2. B
    (ii), (iii) and (iv)
  3. C
    (ii) and (iii)
  4. D
    (i) and (iv)

Solution & Step-by-step Explanation

Concept:

Thyristor can block both forward and reverse voltage in off state.

Explanation:

Switch (i):

image

when Vₐ > V

Diode : OFF, Transistor : ON

when Vₐ < V

Diode : ON, transistor : OFF

Therefore, switch (i) can not block voltages of either polarity when the diode or transistor is in the OFF state.

Switch (ii):

image

when Va > Vb

Diode : ON, Transistor : ON

when Va < Vb

Diode : OFF, transistor : OFF

Therefore, the switch (ii) can block voltages of either polarity when the diode & transistor are in OFF condition.

image

Switch (iii):

image

when Va > Vb

SCR : ON,

when Va < Vb

SCR : OFF

Therefore, switch can block voltages of either polarity when the SCR in OFF state.

image

Switch (iv)

image

when Va > Vb

Diode : OFF

when Va < Vb

SCR : OFF

Therefore, switch (iv) can Not block voltages of either polarity when SCR or diode is in OFF state.

Practice this question

Try it yourself before checking the explanation above.

Figure shows 4 electronic switches (i), (ii), (iii) and (iv). Which of the switches can blockVoltages of either polarity(applied between terminals ‘a’ and ‘b’) when the active device is in OFF state?

image
A
(i), (ii) and (iii)
B
(ii), (iii) and (iv)
C
(ii) and (iii)
D
(i) and (iv)

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