# Of the four biasing circuits shown in below, indicate one which has maximum bias stability

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In a current amplifier, with A =1000 and β = 0.2 the output resistance is 100Ω before current negative feedback is applied. After negative feedback is applied it’s output resistance will be

1.  0.5Ω

2.  20kΩ

3.  500Ω

4.  20Ω

4

20kΩ

Explanation :
No Explanation available for this question

# For the MOSFET CASCODE current mirror circuit shown below, the output impedance resistance at the drain of M4 is

1.  R0 = r04+ r02 (1+gm r04)

2.  R0 = r04- r02 (1+gm r04)

3.  R0 = r02- r04 (1+gm r04)

4.  R0 = r02+ r04 (1+gm r04)

4

R0 = r04+ r02 (1+gm r04)

Explanation :
No Explanation available for this question

# For a negative feedback system with A = 105 & β = 0.02, the percentage change in closed-loop gain Af is

1.  0.5%

2.  5%

3.  0.05%

4.  0.005%

4

0.05\%

Explanation :
No Explanation available for this question

# For the wein-bridge oscillator shown below, if R = 10KΩ, C = 796 PF and R1 =10kΩ, then frequency of Oscillation (f) and the value of R2 is

1.  f = 20k Hz, R2 = 10kΩ

2.   f = 8.15k Hz, R2 = 10kΩ

3.  R = 20k Hz, R2 = 20kΩ

4.  f = 11.54k Hz, R2 = 20kΩ

4

R = 20k Hz, R2 = 20kΩ

Explanation :
No Explanation available for this question

# The gain (Af) of an amplifier with feedback is to be nominally 20, and a variation of 5% is permissible. If the magnitude of the return ration (Aβ) must be at least 1000 then the value of the open loop gain (A) and maximum permissible variation in it is

1.  A = 2000, 400 to 106

2.  A = 20 x 103, 40 to 106

3.   A = 20 x 103, 40 to 106

4.  A = 20 x 103, 40 to 106

4

A = 20 x 103, 40 to 106

Explanation :
No Explanation available for this question

# Generally the gain of a transistor amplifier falls at high frequencies due to the

1.  coupling capacitor at the input

2.  coupling capacitor at the output

3.  internal capacitance of the device

4.  skin effect

4

internal capacitance of the device

Explanation :
No Explanation available for this question

# Which of the following components control the low frequency of the RC coupled amplifier 1. Wiring capacitor 2. Parasitic capacitance of transistor 3. Coupling capacitor 4. Emitter by pass capacitance select – the correct answer using the codes give below

1.  1 and 2

2.  2 and 3

3.  3 and 4

4.  1, 2 and 4

4

3 and 4

Explanation :
No Explanation available for this question

# Which of the following circuit realize self bias with compensation Where T = Trimester S = Sensistor

1.  1 & 3

2.  1 & 2

3.  2 & 3

4.  All

4

1 & 2

Explanation :
No Explanation available for this question

1.

2.

3.

4.  None

4