Semiconductor Electronics

Consider the following logic circuit. [figure] The output is Y = 0 when :

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

The Boolean expression Y = A BC + A C can be realised with which of the following gate configurations. Choose the correct answer from the options given below:

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

Consider an n-type semiconductor in which ne and nh are number of electrons and holes, respectively. Choose the correct answer from the options given below :

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

Choose the correct logic circuit for the given truth table having inputs A and B. [figure]

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

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

1. arrayccc A & B & C \ 0 & 0 & 0 \ 0 & 1 & 0 \ 1 & 0 & 1 \ 1 & 1 & 1 array
2. arrayccc A & B & C \ 0 & 0 & 1 \ 1 & 0 & 0 \ 0 & 1 & 0 \ 1 & 1 & 0 array
3. arrayccc A & B & C \ 0 & 0 & 1 \ 0 & 1 & 0 \ 1 & 0 & 0 \ 1 & 1 & 0 array
4. arrayccc A & B & C \ 0 & 0 & 0 \ 1 & 0 & 0 \ 0 & 1 & 0 \ 1 & 1 & 1 array

A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 resistor connected in series, the zener current is found to be 4 times load current. The load current (IL) and load resistance (RL) are :

1. IL = 0.02 mA; RL = 250
2. IL = 10 A; RL = 0.5
3. IL = 10 mA; RL = 500
4. IL = 20 mA; RL = 250

In the digital circuit shown in the figure, for the given inputs the P and Q values are : [figure]

1. P = 0, Q = 1
2. P = 1, Q = 0
3. P = 0, Q = 0
4. P = 1, Q = 1

[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]