# For a class B amplifier providing a 20V peak signal to 16Ω load and a power supply of Vcc=30V, efficiency will be

1.  52.3%

2.  25.65%

3.  75%

4.  78.6%

4

52.3\%

Explanation :
No Explanation available for this question

# If a two-stage amplifier is required to have an upper cut-off frequency of 2 MHz and a lower cut-off frequency of 30 Hz then upper and lower cut-off frequencies of individual stage are respectively

1.  4MHz, 60Hz

2.  3MHz, 20Hz

3.  3 MHz, 60Hz

4.   4MHz,20Hz

4

3MHz, 20Hz

Explanation :
No Explanation available for this question

# for a transistor, parameters are β=180 and VA=150V, and it is biased at ICQ=2mA. If collector of the transistor is connected to the base terminal, then small signal resistance re=vce/ic of this two-terminal device is

1.  12.88kΩ

2.  12.87Ω

3.  2.33Ω

4.   1.53Ω

4

12.87Ω

Explanation :
No Explanation available for this question

# In the single stage transistor amplifier circuit shown in the figure, if capacitor CE is removed, then ac small signal midband voltage gain of the amplifier will

1.  Increase

2.  Decrease

3.  Remain unaffected

4.   Drop to zero

4

Decrease

Explanation :
No Explanation available for this question

# A signal may have frequency components whichlie in the range of 0.001Hz to 10Hz. Which of the following types of coupling should be chosen in a multistage amplifier designed to amplify this signal

1.  Rc coupling

2.  Transformer coupling

3.  Direct coupling

4.   Double-tuned coupling

4

Direct coupling

Explanation :
No Explanation available for this question

# Class AB operation is often used in power(large signal) amplifiers in order to

1.  Get maximum efficiency

2.  Remove even harmonics

3.  Overcome a cross-over distortion

4.   Reduce collector dissipation

4

Overcome a cross-over distortion

Explanation :
No Explanation available for this question

# Consider self biased circuit given in the figure. If driven by a current source

1.  It will no more work as self-biased circuit

2.  Circuit would stabilize operating point as in the case when driven by voltage source

3.  Stability can be increased with small value of Re

4.   Stability can be increased with increase of α of the transistor

4

It will no more work as self-biased circuit

Explanation :
No Explanation available for this question

# A junction transistor operating at room temperature with Ic =2 mA, where =20 mV and β=100. The value of parameter gm in mho and rπ in ohm respectively are

1.  0.04 and 2500

2.  0.08 and 1250

3.  0.5 and 800

4.   0.08 and 5000

4

0.08 and 1250

Explanation :
No Explanation available for this question

# If an input signal with non-zero dc component is applied to a ow pass RC network, then dc component in the output will be

1.  Same as that in the input

2.  Less than that in the input

3.  More than that in the input

4.   Zero

4

Same as that in the input

Explanation :
No Explanation available for this question

# In the single-stage transistor amplifier circuit shown in the given figure, if capacitor CE is removed, then, ac small-signal midband voltage gain of the amplifier

1.  Increases

2.  Decreases

3.  Is unaffected

4.   Drops to zero

4