In the given figure, a diode D is connected to an external resistance R=100$\Omega $ and an e.m.f. of 3.5 V. If the barrier potential developed across the diode is 0.5 V, the current in the circuit will be:

1. 30 mA

2. 40 mA

3. 20 mA

4. 35 mA

Subtopic: PN junction |

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The input signal given to a CE amplifier having a voltage gain of 150 is ${\mathrm{V}}_{\mathrm{i}}=2\mathrm{cos}\left[15\mathrm{t}+\frac{{\displaystyle \mathrm{\pi}}}{{\displaystyle 3}}\right]$. The corresponding output signal will be:

1. $30\mathrm{cos}\left[15\mathrm{t}+\frac{\mathrm{\pi}}{3}\right]$

2. $75\mathrm{cos}\left[15\mathrm{t}+\frac{2\mathrm{\pi}}{3}\right]$

3. $2\mathrm{cos}\left[15\mathrm{t}+\frac{5\mathrm{\pi}}{3}\right]$

4. $300\mathrm{cos}\left[15\mathrm{t}+\frac{4\mathrm{\pi}}{3}\right]$

Subtopic: Applications of Transistor |

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If in a p-n junction, a square input signal of 10 V is applied as shown,

then the output across R_{L} will be:

1.

2.

3.

4.

Subtopic: PN junction |

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Which logic gate is represented by the following combination of logic gates?

1. OR

2. NAND

3. AND

4. NOR

2. NAND

3. AND

4. NOR

Subtopic: Logic gates |

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The given graph represents the V-I characteristic for a semiconductor device.

Which of the following statement is correct?

1. It is a V-I characteristic for the solar cell where point A represents open-circuit voltage and point B short circuit current.

2. It is for a solar cell and points A and B represent open-circuit voltage and current, respectively.

3. It is for a photodiode and points A and B represent open-circuit voltage and current respectively.

4. It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively.

Subtopic: Applications of PN junction |

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The barrier potential of a p-n junction depends on:

(a) type of semiconductor material

(b) amount of doping

(c) temperature

Which one of the following is correct?

1. (a) and (b) only

2. (b) only

3. (b) and (c) only

4. (a),(b) and (c)

Subtopic: PN junction |

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In an n-type semiconductor, which of the following statement is true?

1. Electrons are minority carriers and pentavalent atoms are dopants.

2. Holes are minority carriers and pentavalent atoms are dopants.

3. Holes are the majority carriers and trivalent atoms are dopants.

4. Electrons are majority carriers and trivalent atoms are dopants.

2. Holes are minority carriers and pentavalent atoms are dopants.

3. Holes are the majority carriers and trivalent atoms are dopants.

4. Electrons are majority carriers and trivalent atoms are dopants.

Subtopic: Types of Semiconductors |

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In a common emitter (CE) amplifier having a voltage gain G, the transistor used has trans conductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be:

1. 1.5G

2. $\frac{1}{3}$G

3. $\frac{5}{4}$G

4. $\frac{2}{3}$G

Subtopic: Applications of Transistor |

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The output (X) of the logic circuit shown in figure will be:

1. X = $\overline{\mathrm{A}\xb7\mathrm{B}}$

2. X = A.B

3. X = $\overline{\mathrm{A}+\mathrm{B}}$

4. X = $\overline{\overline{\mathrm{A}}}\xb7\overline{\overline{\mathrm{B}}}$

Subtopic: Logic gates |

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Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is:

** **

1. 0.75 A

2. zero

3. 0.25 A

4. 0.5 A

Subtopic: PN junction |

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