Semiconductor Electronics

The output of OR gate is 1

1. if both inputs are zero
2. if either or both inputs are 1
3. only if both inputs are 1
4. if either input is zero

Of the diodes shown in the following diagrams, which one is reverse biased?

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

Reverse bias applied to a junction diode

1. lowers the potential barrier
2. raises the potential barrier
3. increases the majority carrier current
4. increases the minority carrier current

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

1. 25 Hz
2. 50 Hz
3. 70.7 Hz
4. 100 Hz

Barrier potential of a p-n junction diode does not depend on

1. diode design
2. temperature
3. forward bias
4. doping density

An n-p-n transistor conducts when

1. both collector and emitter are positive with respect to the base
2. collector is positive and emitter is negative with respect to the base
3. collector is positive and emitter is at same potential as the base
4. both collector and emitter are negative with respect to the base

In a p-n junction

1. high potential at n side and low potential at p side
2. high potential at p side and low potential at n side
3. p and n both are at same potential
4. undetermined.

The given truth table is for which logic gate? [figure]

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

For the given circuit of p-n junction diode, which is correct? [figure]

1. in forward bias the voltage across R is V
2. in reverse bias the voltage across R is V
3. in forward bias the voltage across R is 2V
4. in reverse bias the voltage across R is 2V.

For a transistor ICIE = 0.96, then current gain for common emitter is

1. 12
2. 6
3. 48
4. 24