Question 1 : A circuit is so formed such that the source-R-C-diode-switch are in series. Consider the initial voltage across the C to be zero. The diode is so connected that it is forward biased when the switch is closed. When the switch is closed,
1. the current will decay exponentially & the voltage will increase exponentially
2. the current will increase exponentially & the voltage will increase exponentially
3. the current will fall to zero & the voltage both will decay exponentially
4. the voltage and current both remain constant
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Question 2 : The time constant of a series RL circuit (τ) is given by
1. R/L
2. L/R
3. RC
4. 1/RL
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Question 3 : The time constant of a series RC circuit (τ) is given by
1. R/C
2. C/R
3. RC
4. 1/RC
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Question 4 : A circuit is so formed such that source-R-L-diode-switch are all in series. Consider the initial current in L to be zero. The diode is so connected that it is forward biased when switch is closed.
When the switch is closed,
1. the current will decay exponentially & the voltage will increase exponentially
2. the current will increase exponentially & the voltage will decay exponentially
3. the current will fall to zero & the voltage both will decay exponentially
4. the voltage and the current both remain constant
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Question 5 : An ideal diode has _________ &__________
1. some forward voltage drop, some reverse recovery time
2. high switching losses, high reverse voltage drop
3. no forward voltage drop, negligible reverse recovery time
4. no reverse recovery time, high leakage current
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Question 6 : For a diode circuit the voltage across the capacitor is given by
Vc(t)= Vs(1-e^(-t/RC))
Then the initial rate of change of capacitor voltage is given by
1. 0
2. ∞
3. Vs x RC
4. Vs/RC
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Question 7 : When diode is connected in series to an AC source & RL load, the conduction time for the diode
1. is always less than π
2. is 0
3. is π
4. can be greater than π
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Question 8 : A diode circuit is so arranged that when the switch is open it's KVL gives
Ri+ 1/C ∫i dt = 0
When the switch is closed,
Ri+ 1/C ∫i dt = Vs
Vs is the dc supply voltage.
The diode is so connected that it is forward biased when switch is closed
The circuit is mostly likely be a
1. diode in parallel with Vs, switch, R & C
2. diode in series with R, than parallel with Vs & C
3. diode in series with the switch, R, C & Vs
4. diode in series with R,C & Vs with the switch connected in parallel across Vs
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Question 9 : When a diode is connected in series with an AC source & R load, the conduction time per cycle is
1. 0
2. 2π
3. π
4. π/2
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