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Which of the following represents a circuit that gives an output (i.e. true) when both its inputs are equal?
1.
2.
3.
4.

Subtopic:  Logic gates |
 57%
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The current-voltage characteristic of an ideal p-n junction diode is given by the graph as shown in the following figure:

This diode is connected with a resistance of 5 Ω in series with it as shown below:

Which of the following shows the dependence of the voltage VAB and the current i, when the diode is forward-biased?
(VAB in volt, i in ampere)
 
1. VAB=i5+0.6
2. VAB=i50.6
3. VAB=i5+(0.65)
4. VAB=i5+(0.6+5)
Subtopic:  PN junction |
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The voltage VAB=20 V at its peak value, and is sinusoidal in time. The current i (in amperes), when plotted as a function of time, is given by:
(consider the diodes as ideal.)
    
1. 2.
3. 4.
 
Subtopic:  PN junction |
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The circuit shown in figure is given an input signal Vi, which varies with time and the corresponding output is Vo. Then,
1. Vo=Vi+E
2. Vo=ViE
3. Vo=Vi, only when Vi>E
4. Vo=Vi, only when Vi<E
Subtopic:  PN junction |
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Under what conditions will diode D1 conduct?
         

1. VA>VB+V0
2. VA<VB+V0
3. VA>VBV0
4. VA<VBV0
Subtopic:  PN junction |
 65%
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In the circuit shown in the adjacent diagram, D1,D2 are ideal diodes and r's are small resistances. Then:
1. no current flows in the circuit
2. current flows anticlockwise
3. current flows clockwise
4. current only flows through D2 and not through D1
Subtopic:  Applications of PN junction |
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The current flowing through the diode D2 is:

1. zero
2. 4 mA
3. 2.5 mA
4. 0.8 A
Subtopic:  Applications of PN junction |
 68%
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D1,D2 are ideal diodes and the output (VAB) of the transformer is 10 V (RMS). The current through the resistor is:

1. zero
2. 20 mA
3. 40 mA
4. 202 mA
Subtopic:  Applications of PN junction |
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What does the following logic circuit represent?
1. AND 2. OR
3. NOR 4. XOR
Subtopic:  Logic gates |
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For the above circuit, the applied voltage V(t) is periodic and linear, and is shown by the waveform below:
    
The current flowing through R2 varies as:
1. 2.
3. 4.
Subtopic:  PN junction |
 57%
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