# The positive-feedback in an amplifier circuit will

1.  Increases the gain

2.   Decreases the gain

3.  Not affect the gain

4.  Decreases up to certain frequency and after that gain remains constant.

4

Increases the gain

Explanation :
No Explanation available for this question

# The input differential stage of an Op-Amp 741 is biased at about 10????A current. Such a low current of the input stage gives. 1. High CMRR 2. Low differential gain 3. High differential gain 4. High input impedance Where of these is correct

1.   1 & 2 The input differential stage of an Op-Amp 741 is biased at about 10????A current. Such a low current of the input stage gives.

2.  1, 3 & 4

3.  2 & 4

4.  1, 2, 3 & 4

4

1, 3 & 4

Explanation :
No Explanation available for this question

# The circuit shows current mirror biasing for 1C’s. given VCC= 10V.ICI = 1mA and VBE= 0.7V, the value of R is

1.  10 KΩ

2.  9.3 KΩ

3.  5.5 KΩ

4.  4.65 KΩ

4

9.3 KΩ

Explanation :
No Explanation available for this question

# The Condition which is required to get sustained oscillation is.

1.  Barkhausen criterion

2.

3.  Total phase shift introduced from amplifier and feedback network must be equal to Zero or multiples of 2π radians

4.  All of the above

4

All of the above

Explanation :
No Explanation available for this question

# For the circuit shown below, the Q – point of the transistor is (12 V, 2 mA ). When β = 60. If the transistor is replaced by new one with β = 100, then new value of Q – point is

1.   4.2 V, 3.3 mA

2.  6.8 V, 2.5 mA

3.  3.3 V, 4.2 mA

4.  None

4

4.2 V, 3.3 mA

Explanation :
No Explanation available for this question

# Crystals are used to convert mechanical energy in to electrical energy and vice versa This phenomenon is known as

1.  Piezoconductivity effect

2.  Piezomagnetic effect

3.   Piezoelectric effect

4.  None

4

Piezoelectric effect

Explanation :
No Explanation available for this question

# Consider the following statements regarding feedback amplifier. a. The -ve feedback amplifier having two non repeated poles at negative real axis is always stable irrespective of amount of feedback b. If the number of poles increased from two poles, then –ve feed back always may cause instability in the System. Which of the above statement is/are correct.

1.  Both 1 or 2

2.  Only 1

3.  Only 2

4.  Neither 1 nor 2

4

Both 1 or 2

Explanation :
No Explanation available for this question

# For the circuit shown below, if current gain of the transistor is 30 then the value of V1 such that transistor operates in active region and corresponding collector emitter voltage is 6 V

1.   2.155 V

2.  3.97 V

3.  1.257 V

4.  1.24 V

4

3.97 V

Explanation :
No Explanation available for this question

# Consider the following statements. In order to generate square wave from a sinusoidal input signal one can use a. Schmitt Trigger circuit b. clippers and amplifiers c. Monostable multivibrators Which of the above statement is/are correct

1.  1 alone

2.  1 & 2

3.  2 & 3

4.  1. 2 & 3

4

1 alone

Explanation :
No Explanation available for this question

# Match the List – I with List – II i.e, the type of amplifier and their input (Rin) and output (Rout) impedances List – I List – II Rin Rout A. Voltage amplifier 1. Low High B. Current amplifier 2. High Low C. Transresistance amplifiers 3. Low Low D. Transconductance amplifier 4. High High

1.   A B C D 2 1 4 3

2.   A B C D 1 2 4 3

3.   A B C D 1 2 3 4

4.   A B C D 2 1 3 4

4