# The resonant frequency of the wein bridge oscillator of given in figure, is

1.  19597 Hz

2.  1592.35 Hz

3.  3120.7 Hz

4.  4777 Hz.

4

3120.7 Hz

Explanation :
No Explanation available for this question

# RC network shown in the given figure can prove maximum theoretical phase shift of

1.  900

2.  1800

3.  2700

4.  3600

4

1800

Explanation :
No Explanation available for this question

# If an amplifier with resistive negative feedback has two left half planes poles in its open transfer function then amplifier

1.  Will always be unstable at high frequencies

2.  Will be stable for all frequencies

3.  May be unstable, depending upon the feedback factor

4.  Will oscillate at low frequencies.

4

Will be stable for all frequencies

Explanation :
No Explanation available for this question

# A high Q-quartz crystal exhibits series resonance at the frequency ωB and parallel resonance at ωp. then

1.  ωs is very close but less than ωp

2.  ωs

3.  ωs is very close, but greater than ωp

4.  ωs>> ωp

4

ωs is very close but less than ωp

Explanation :
No Explanation available for this question

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

1.  Voltage-shunt feedback

2.  Current-series feedback

3.  Negative-voltage feedback

4.  Positive-current feedback.

4

Negative-voltage feedback

Explanation :
No Explanation available for this question

# Given figure represents ac equivalent circuit of a parallel voltage feedback amplifier stage. If hfe, common collector operations respectively at Q, then current gain(I0/It) of this stage is

1.

2.  hfe

3.

4.  hfe.

4

Explanation :
No Explanation available for this question

# An amplifier with mid-band gain |A| =500 has negative feedback β= .If upper cut-off without feedback were at 60 Hz, then with feedback it would become

1.  10 KHz

2.  12 KHz

3.  300 KHz

4.  360 KHz.

4

360 KHz.

Explanation :
No Explanation available for this question

# Feedback factor for the circuit shown in the given figure is

1.  9/100

2.  9/10

3.  1/9

4.  1/100

4

1/100

Explanation :
No Explanation available for this question

# If differential amplifier has a differential gain of 90,000.CMRR=80 dB, then common mode gain is

1.  2

2.  1

3.  1/2

4.  0.

4

2

Explanation :
No Explanation available for this question

1.  2VS

2.  -2VS

3.  3VS

4.  -3VS.

4