The input signal given to a CE amplifier having a voltage gain of 150 is ${\mathrm{V}}_{\mathrm{i}}=2\cos \left[15\mathrm{t}+\frac{{\displaystyle \mathrm{\pi }}}{{\displaystyle 3}}\right]$. The corresponding output signal will be:

1. $30 \cos \left[15\mathrm{t}+\frac{\mathrm{\pi }}{3}\right]$

2. $75 \cos \left[15\mathrm{t}+\frac{2\mathrm{\pi }}{3}\right]$

3. $2 \cos \left[15\mathrm{t}+\frac{5\mathrm{\pi }}{3}\right]$

4. $300 \cos \left[15\mathrm{t}+\frac{4\mathrm{\pi }}{3}\right]$

If in a p-n junction, a square input signal of 10 V is applied as shown, 

then the output across R_L will be:

1. 

2. 

3. 

4. 

Which logic gate is represented by the following combination of logic gates? 

   

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

The given graph represents the V-I characteristic for a semiconductor device.

Which of the following statement is correct?

1. It is a V-I characteristic for the solar cell where point A represents open-circuit voltage and point B short circuit current.

2. It is for a solar cell and points A and B represent open-circuit voltage and current, respectively.

3. It is for a photodiode and points A and B represent open-circuit voltage and current respectively.

4. It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively.

The barrier potential of a p-n junction depends on: 

(a) type of semiconductor material 
(b) amount of doping 
(c) temperature 

Which one of the following is correct?

1. (a) and (b) only

2. (b) only

3. (b) and (c) only

4. (a),(b) and (c)

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is:
   

1. 0.75 A

2. zero

3. 0.25 A

4. 0.5 A

In a CE transistor amplifier, the audio signal voltage across the resistance of 2 k$\Omega$ is 2V. If the base resistance is 1 k$\Omega$ and the current amplification of the transistor is 100, the input signal voltage is:

1. 0.1 V

2. 1.0 V

3. 1 mV

4. 10 mV