Semiconductor Electronics

[figure] For the circuit shown above, equivalent GATE is :

1. NOT gate
2. NAND gate
3. AND gate
4. OR gate

The truth table for the circuit given below is : [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following circuits has the same output as that of the given circuit? [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

[figure] In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage VAB is correctly represented by:

1. [figure]
2. [figure]
3. VAB would be zero at all times.
4. [figure]

Consider the following statements : Choose the correct answer from the options given below :

1. A, C, E Only
2. B, E Only
3. A, C Only
4. B, D, E Only

The output of the circuit is low (zero) for : [figure] Choose the correct answer from the options given below :

1. (A), (B) and (C) only
2. (A), (C) and (D) only
3. (B), (C) and (D) only
4. (A), (B) and (D) only

What is the current through the battery in the circuit shown below? [figure]

1. 1.5 A
2. 0.25 A
3. 1.0 A
4. 0.5 A

Which of the following circuits represents a forward biased diode? [figure] Choose the correct answer from the options given below:

1. (C) and (E) only
2. (A) and (D) only
3. (B), (D) and (E) only
4. (B), (C) and (E) only

[figure] To obtain the given truth table, following logic gate should be placed at G :

1. NOR Gate
2. OR Gate
3. AND Gate
4. NAND Gate

A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is :

1. 1243 nm
2. 875 nm
3. 650 nm
4. 1400 nm

[figure] In the truth table of the above circuit the value of X and Y are :

1. 1, 1
2. 0, 1
3. 1, 0
4. 0, 0

The I–V characteristics of an electronic device are shown in the figure. The device is : [figure]

1. a solar cell
2. a transistor which can be used as an amplifier
3. a diode which can be used as a rectifier
4. a zener diode which can be used as a voltage regulator

The output Y of following circuit for given inputs is : [figure]

1. A B
2. A B
3. A B(A + B)
4. 0

A potential divider circuit is connected with a dc source of 20 V, a light emitting diode of glow in voltage 1.8 V and a zener diode of breakdown voltage of 3.2 V. The length (PR) of the resistive wire is 20 cm. The minimum length of PQ to just glow the LED is cm. [figure]

The correct truth table for the following logic circuit is : [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

The acceptor level of a p-type semiconductor is 6 eV. The maximum wavelength of light which can create a hole would be : Given hc = 1242 eV nm.

1. 407 nm
2. 103.5 nm
3. 414 nm
4. 207 nm

Following gates section is connected in a complete suitable circuit. [figure] For which of the following combination, bulb will glow (ON) :

1. A = 1, B = 1, C = 1, D = 0
2. A = 1, B = 0, C = 0, D = 0
3. A = 0, B = 0, C = 0, D = 1
4. A = 0, B = 1, C = 1, D = 1

The output (Y) of logic circuit given below is 0 only when : [figure]

1. A = 0, B = 0
2. A = 0, B = 1
3. A = 1, B = 0
4. A = 1, B = 1

The value of net resistance of the network as shown in the given figure is : [figure]

1. ( 3011 )
2. 6
3. ( 52 )
4. ( 154 )

Which of the diode circuits shows correct biasing used for the measurement of dynamic resistance of p-n junction diode :

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Identify the logic gate given in the circuit : [figure]

1. OR gate
2. NAND gate
3. NOR gate
4. AND gate

In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance Rs to regulate the input unregulated supply is : [figure]

1. 10 k
2. 10
3. 1 k
4. 37 k < Rs < 35 k

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be ( X8 )eV. The value of X is : (Given, h=6.6 10-34 Js, e=1.6 10-19 C)

1. 11
2. 13
3. 15
4. 21

Identify the logic operation performed by the given circuit. [figure]

1. AND
2. NOR
3. OR
4. NAND

[figure] The output of the given circuit diagram is -

1. [figure]
2. [figure]
3. [figure]
4. [figure]

A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the figure. The current through the Zener diode is : [figure]

1. 0
2. 30 mA
3. 20 mA
4. 50 mA

[figure] In the given circuit, the voltage across load resistance (RL) is :

1. 8.75 V
2. 9.00 V
3. 8.50 V
4. 14.00 V

In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the value of Iz ? [figure]

1. 3.3 mA
2. 10 mA
3. 5.5 mA
4. 7 mA

The truth table for this given circuit is : [figure]

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Which of the following circuits is reverse - biased?

1. [figure]
2. [figure]
3. [figure]
4. [figure]