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WorksheetsOP-Amp Unit-1 B.SC. (I.T.)
Total questions: 25
Worksheet time: 13mins
An ideal op-amp has
Infinite differential voltage gain
Infinite input resistance
Zero output resistance
All the above
The Op-amp can amplify:
only d.c. signals only
a.c. signals
both a.c. and d.c. signals
Neither d.c. nor a.c. signals
Identify the circuit
Inverting amplifier
voltage follower
Differential amplifier
Non inverting amplifier
Open loop Bandwidth of 741 op amp is
5 Hz
5 Mhz
1 Mhz
10 Khz
A voltage follower
has a voltage gain of 1
is Non inverting
has no feedback resistor
has all of these
A certain Non inverting amplifier has R1is 1 kΩ and Rf is 100 kΩ. The closed-loop voltage gain is:
100
1000
100,000
101
Which concept states that if one input terminal of an op-amp is at zero potential, then the other one also will be at zero potential?
Virtual short
Virtual ground
Zero input current
None of the above
The gain equation of inverting amplifier is
R1/Rf
Rf/R1
-Rf/R1
-R1/Rf
What is the Open Loop Gain of an IDEAL amplifier?
zero
1
1 000
a million
infinite open loop gain
Identify the circuit
Inverting amplifier
voltage follower
Differential amplifier
Non inverting amplifier
What is the INPUT impedance of an IDEAL amplifier?
0 Ω
100 Ω
1 000 Ω
1 000 000 Ω
Infinite impedance
Determine the output voltage from the following circuit diagram?
None of the mentioned
An op-amp is a __________________ voltage amplifier.
DC coupled
AC coupled
DC singled
AC singled
What sort of amplifier is this?
Summing amplifier
Voltage follower
Inverting amplifier
Non-inverting amplifier
If voltage on the inverting input is greater than voltage on the non-inverting input, then the output is
positive.
negative
When the feedback signal is 180˚ out of phase with input signal or when feedback signal weaken the input signal it is called :
Positive feedback
Negative feedback
Regenerative feedback
None of the Above
1.Stabilizes the gain.
2.Reduction in Non Linear distortion.
3.Reduction in Noise.
4.Increase in Bandwidth or improvement in frequency response.
5.Increase in input impedance.
6. Decrease in output impedance
All these are features of which feedback?
Negative Feedback
Positive Feedback
What is CMRR?
Common Mode Repeated Ratio
Common Mode Reverse Ratio
Common Mode Rejection Ratio
Right definition of CMRR is:
The ability of Opamp to reverse common mode signal
The ability of opamp to reject Common mode signals
The ability of opamp to regain common mode output
Differential Amplifier work in two modes:
1. Differential Mode
2. Common Mode
Right
Wrong
Which analysis of differential amplifier is performed by making DC voltages VCC and VEE = 0 ?
A.C. Analysis
D.C. Analysis
None of the above
Both in AC and DC analysis
Select the false statement for feedback from the following :
Amplifiers use negative feedback
Oscillators use Positive feedback
The output signal is 180 degree out of phase in Positive feedback
Output resistance with feedback ROF is ............... times the input resistance without feedback RF or
ROF = ..........RF
1/1+A times
1/ AB times
1/ 1+ AB times
A Differential Amplifier has Differential Gain 200 and Common Mode Gain 0.01. Then CMRR is ......
1000
20000
10000
100
For a given Opamp CMRR is 103 and Differential Gain is
2 ×104 . Find Common Mode Gain.200
20
2000
