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415.

Fig. shows a step-down chopper switched at 1 KHz with a duty ratio D = 0.5. The peak-peak ripple in the load current is close to

[2 marks]
(a) 10 A
(b) 0.5 A
(c) 0.125 A
(d) 0.25 A

asked in Electrical Engineering, 2005

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416.

An electronic switch S is required to block voltages of either polarity during its OFF state as shown in Figa. This switch is required to conduct in only one direction during its ON state as shown in Figb.

Which of the following are valid realizations of the switch S?

[2 marks]
(a) Only P
(b) P and Q
(c) P and R
(d) R and S

asked in Electrical Engineering, 2005

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417.

Fig. shows the voltage across a power semiconductor device and the current through the device during a switching transition. Is the transition a turn ON transition or a turn OFF transition? What is the energy lost during the transition?

[2 marks]
(a) Turn ON, VI(t₁+t₂)/2
(b) Turn OFF, VI(t₁+t₂)/2
(c) Turn OFF, VI(t₁+t₂)
(d) Turn ON, VI(t₁+t₂)

asked in Electrical Engineering, 2005

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418.

In Fig, as long as X₁ = 1 and X₂ = 1, the output Q remains

[2 marks]
(a) at 1
(b) at 0
(c) at its initial value
(d) unstable

asked in Electrical Engineering, 2005

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419.

If X₁ and X₂ are the inputs to the circuit shown in Fig, the output Q is:

[2 marks]

asked in Electrical Engineering, 2005

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420.

Select the circuit, which will produce the given output Q for the input signals X₁ and X₂ given in Fig.

[2 marks]

asked in Electrical Engineering, 2005

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