Semiconductor Electronics

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