A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω and an output impedance of 200 Ω. The power gain of the amplifier is:

1. 500

2. 1000

3. 1250

4. 50

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:

1. 90

2. 10

3. 1.25

4. 100

A transistor is operated in a common emitter configuration at constant collector voltage V_c = 1.5 V such that a change in the base current from 100 μA to 150 μA produces a change in the collector current from 5 mA to 10 mA. The current gain (β) is:

1. 67

2. 75

3. 100

4. 50

The device that can act as a complete electronic circuit is:

1. Junction diode

2. Integrated circuit

3. Junction transistor

4. Zener diode

Transfer characteristics [output voltage (${\mathrm{V}}_{\mathrm{o}}$) vs input voltage (${\mathrm{V}}_{\mathrm{i}}$)] for a base biased transistor in CE configurations are as shown in the figure. For using the transistor as a switch, it is used:

1. In region III

2. Both in the region (I) and (III)

3. In region II

4. In region I

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

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