Q. No.Given below are two statements:
Choose the correct answer from the options given below:
| Assertion (A): | A diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically. |
| Reason (R): | Below the critical voltage limit, only majority charge carries flow which increases drastically above critical voltage. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Applications of PN junction |
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A diode has Zener voltage of \(10~\text{V}\) and maximum power dissipation of \(0.5~\text{W},\) then the minimum resistance to be used in series with this diode for safety when it is connected to a \(25~\text{V}\) power supply is:
1. \(100~\Omega\)
2. \(250~\Omega\)
3. \(300~\Omega\)
4. \(350~\Omega\)
1. \(100~\Omega\)
2. \(250~\Omega\)
3. \(300~\Omega\)
4. \(350~\Omega\)
Subtopic: Applications of PN junction |
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The maximum rated power of the LED is \(2~\text{mW}\) and it is used in the circuit with input voltage of \(5~\text{V}\) as shown in the figure below. The current through resistance \(R_S\) is \(0.5~\text{mA}\). The minimum value of the resistance of \(R_S\), to ensure that the LED is not damaged is: (in \(k\Omega\))
1. \(6\)
2. \(2\)
3. \(4\)
4. \(5\)
1. \(6\)
2. \(2\)
3. \(4\)
4. \(5\)
Subtopic: Applications of PN junction |
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For the given circuit (shown in part \((A)\)) the time dependent input voltage \(v_{i n}(t)\) and corresponding output \(v_{o}(t)\) are shown in part (\(B\)) and part (\(C\)), respectively. Identify the components that are used in the circuit between points \(X\) and \(Y\).
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Applications of PN junction |
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For the given logic circuit, which of the following inputs combination will make both LED-1 and LED-2 to glow?
1. \(A=0, B=1, C=1\)
2. \(A=1, B=0, C=0\)
3. \(A=1, B=0, C=1\)
4. \(A=1, B=1, C=0\)
1. \(A=0, B=1, C=1\)
2. \(A=1, B=0, C=0\)
3. \(A=1, B=0, C=1\)
4. \(A=1, B=1, C=0\)
Subtopic: Applications of PN junction |
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The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at \(V_z = 5~\text{V}\) and the desired current in a load is \(5~\text{mA}\). The unregulated voltage source can supply upto \(25~\text{V}\). Considering the Zener diode can withstand four times of the load current, the value of resistor \(R_S\) (shown in circuit) should be: (in \(\Omega\))
1. \(4000\)
2. \(10\)
3. \(800\)
4. \(1000\)
1. \(4000\)
2. \(10\)
3. \(800\)
4. \(1000\)
Subtopic: Applications of PN junction |
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A voltage regulating circuit consisting of Zener diode, having break-down voltage of \(10 ~\text{V}\) and maximum power dissipation of \(0.4~ \text{W},\) is operated at \(15 ~\text{V}.\) The approximate value of protective resistance in this circuit is: (in \(\Omega\))
1. \(100\)
2. \(150\)
3. \(125\)
4. \(130\)
1. \(100\)
2. \(150\)
3. \(125\)
4. \(130\)
Subtopic: Applications of PN junction |
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The output voltage in the following circuit is:
(Consider ideal diode case)
1. \(10~\text V \)
2. \(0~\text V \)
3. \(+5~\text V \)
4. \(-5~\text V \)
(Consider ideal diode case)
1. \(10~\text V \)
2. \(0~\text V \)
3. \(+5~\text V \)
4. \(-5~\text V \)
Subtopic: Applications of PN junction |
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In the following circuit, the reading of the ammeter will be: (Take Zener breakdown voltage \(=4 ~\text V~\))
1. \(60~\text{mA}\)
2. \(10~\text{mA}\)
3. \(24~\text{mA}\)
4. \(80~\text{mA}\)
1. \(60~\text{mA}\)
2. \(10~\text{mA}\)
3. \(24~\text{mA}\)
4. \(80~\text{mA}\)
Subtopic: Applications of PN junction |
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A zener diode with \(5 ~\text{V}\) zener voltage is used to regulate an unregulated dc voltage input of \(25 ~\text{V}.\) For a \(400 ~\Omega\) resistor connected in series, the zener current is found to be \(4\) times load current. The load current \((I_L)\) and load resistance \((R_L)\) are:
1. \(I_L=10 ~\text{mA} ; R_L=500 ~\Omega\)
2. \(I_L=0.02 ~\text{mA} ; R_L=250 ~\Omega\)
3. \(I_L=20 ~\text{mA} ; R_L=250 ~\Omega\)
4. \(I_L=10 ~\text A ; R_L=0.5~ \Omega \)
1. \(I_L=10 ~\text{mA} ; R_L=500 ~\Omega\)
2. \(I_L=0.02 ~\text{mA} ; R_L=250 ~\Omega\)
3. \(I_L=20 ~\text{mA} ; R_L=250 ~\Omega\)
4. \(I_L=10 ~\text A ; R_L=0.5~ \Omega \)
Subtopic: Applications of PN junction |
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