In a P -N junction

the potential of P & N sides becomes higher alternately
the P side is at higher electrical potential than N side.
the N side is at higher electric potential than P side.
both P& N sides are at same potential.

Solution

[Hint : For easy flow of current the P side must be connected to +ive terminal of battery i.e., it is connected to higher potential in comparison to N. This connection is called forward biased. In this case the input resistance is very low.In reverse-biased, the P-side is connected to –ive terminal & N side to (+ive) terminal to battery.In this case input resistance is very high.

The forward biasd diode is

Solution

The circuit has two oppositively connected ideal diodes in parallel. What is the current flowing in the circuit?

1.71 A
2.00 A
2.31 A
1.33 A

Solution

If the ratio of the concentration of electrons to that of holes in a semiconductor is and the ratio of currents is ⁷⁄₄,then what is the ratio of their drift velocities?

Solution

The time variations of signals are given as in A, B and C.Point out the true statement from the following :

A, B and C are analogue signals
A and B are analogue, but C is digital signal
A and C are digital, but B is analogue signal
A and C are analogue, but B is digital signal

Solution

A and C are analogue but B is digital signal.

The real time variation of input signals A and B are as shown below. If the inputs are fed into NAND gate, then select the output signal from the following.

Solution

In common emitter amplifier, the current gain is 62. The collector resistance and input resistance are 5 kΩ an 500Ω respectively. If the input voltage is 0.01 V, the output voltage is

0.62 V
6.2 V
62 V
620 V

Solution

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table.

Solution

The truth table given below is for

NOR
AND
XOR
NAND

Solution

The given truth table is for NAND gate

In a transistor, the change in base current from 100 µA to 125 µA causes a change in collector current from 5 mA to 7.5 mA, keeping collector-to-emitter voltage constant at 10V.What is the current gain of the transistor?

Solution

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