# Consider the following circuit: What is the value of R4 in the circuit, if the voltage V- and V+ are to be amplified by the same amplification factor

1.  7kΩ

2.  22kΩ

3.  33kΩ

4.   35kΩ

4

22kΩ

Explanation :
No Explanation available for this question

# A uniformly doped npn bipolar transistor has following parameters NE=1018cm-3 NB=5*1016cm-3 NC=2*1019cm-3 DE=8cm2/s DB=15cm2/s Dc=8cm2/s XE=0.8μm XB=0.7μm The emitter injection efficiency γ is

1.  0.999

2.  0.977

3.  0.982

4.  0.934

4

0.977

Explanation :
No Explanation available for this question

# Consider the circuit What is the function of Diode D2 in the above circuit

1.  To avoid saturation of the op-Amp

2.  To provide negative feedback when the input is negative

3.  To reduce reverse breakdown voltage of D1

4.   As a buffer

4

To avoid saturation of the op-Amp

Explanation :
No Explanation available for this question

# The transfer function of a transistor amplifier is given by Av== Which one of the following gives the approximate upper 3-dB frequency fH of the amplifier

1.  4x105 Hz

2.  2.2x106 Hz

3.  4x106 Hz

4.   4.4x106 Hz

4

4x105 Hz

Explanation :
No Explanation available for this question

# In a transistor, forward bias across the base emitter junction is kept constant and reverse bias across the collector base junction is increased. Neglecting leakage across the collector base junction and depletion region generation current, the base current will

1.  Increase

2.  Decrease

3.  Remain constant

4.  None of these

4

Decrease

Explanation :
No Explanation available for this question

# select the correct output(v0) wave-shape for a given input(vi) in the clamping network given below:

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In a common emitter amplifier, the unbiased emitter resistance provides

1.  Voltage shunt feed back

2.  Current series feed back

3.  Negative voltage feedback

4.  Positive current feed back

4

Current series feed back

Explanation :
No Explanation available for this question

# In an RC-coupled common emitter amplifier

1.  Coupling capacitance affects the hf response and bypass capacitance affects the If response

2.  Both coupling and bypass capacitance affect the If response only

3.  Both coupling and bypass capacitance affect the hf response only

4.  Coupling capacitance affects the If response and the bypass capacitance affects the hf response

4

Coupling capacitance affects the If response and the bypass capacitance affects the hf response

Explanation :
No Explanation available for this question

# α-cutoff frequency of a bipolar junction transistor

1.  Increase with increase in the base width

2.  Increase with increase in the collector width

3.  Increase with increase in the temperature

4.  Increase with decrease in the base width

4

Increase with increase in the collector width

Explanation :
No Explanation available for this question

# Negative feedback in amplifiers

1.  Improve signal to noise ratio at the input

2.   Improve signal to noise ratio at the output

3.  Does not effect signal to noise ratio at the output

4.  Reduces distortion

4