1. What type of signal can Op-amp amplify:
a) AC signals only
b) DC signals only
c) Both ac and dc signals
d) Neither ac not dc signals
2. The typical input stage of an op amp has a
a) Single-ended input and single-ended output
b) Single-ended input and differential output
c) Differential input and single-ended output
d) Differential input and differential output
3. The input offset current equals the
a) Difference between the two base currents
b) Average of the two base currents
c) Collector current divided by current gain
d) Difference between the two base-emitter voltages
4. Which of the following statement is not correct about ideal op-amp characteristics?
a) Input Resistance = 0
b) Output impedance = 0
c) Bandwidth= Infinity
d) Open loop voltage gain = Infinity
5. Output of integrator for a step input.
a) Sinusoidal Wave
b) Ramp
c) Triangular Wave
d) Triangular Wave with dc bias
6. When the two input terminals of a diff amp are grounded
a) The base currents are equal
b) The collector currents are equal
c) An output error voltage usually exists
d) The ac output voltage is zero
7. An op amp has a voltage gain of 200,000. If the output voltage is 1 V, the input voltage is
a) 2 μV
b) 5 μV
c) 10 V
d) 1 V
8. The voltage follower has a
a) Closed-loop voltage gain of unity
b) Small open-loop voltage gain
c) Closed-loop bandwidth of zero
d) Large closed-loop output impedance
9. The voltage out of a Schmitt trigger is
a) A low voltage
b) A high voltage
c) Either a low or a high voltage
d) A sine wave
10. If the input is a rectangular pulse, the output of an integrator is a
a) Sine wave
b) Square wave
c) Ramp
d) Rectangular pulse
11. An instrumentation amplifier has a high
a) Output impedance
b) Power gain
c) CMRR
d) Supply voltage
12. The output of op-amp increases 8V in 12µs. The slew rate might be
a) 0.7 V/μs
b) 0.6 V/us
c) 0.64 V/us
d) None of the above
13. If the cutoff frequency is 20 Hz and the mid band open loop voltage gain is 1,000 the unity gain frequency is
a) 20 Hz
b) 1 KHz
c) 2 KHz
d) 20 KHz
14. An ideal Op amp is ideal
a) CCCS
b) CCVS
c) VCVS
d) VCCS
15. Find the input voltage of an ideal op-amp. It's one of the inputs and output voltages are 2V and 12V. (Gain=3)
a) 4V
b) -4V
c) 8V
16. Calculate the output voltage for the given circuit.
a) Vo = 7v
b) Vo = 5.9v
c) Vo = 12v
d) Vo = 11.4v
17. When a large sine wave drives a Schmitt trigger, the output is a
a) Rectangular wave
b) Triangular wave
c) Rectified sine wave
d) Series of ramps
18. When the initial slope of a sine wave is greater than the slew rate
a) Distortion occurs
b) Linear operation occurs
c) Voltage gain is maximum
d) The op amp works best
19. In a differential amplifier, CMRR can be improved by using an increased
a) Emitter resistance
b) Collector resistance
c) Power supply voltages
d) Source resistance
20. One input terminal of high gain comparator circuit is connected to ground and a sinusoidal voltage is applied to the other input. The output of comparator will be
a) A sinusoid
b) A full rectified sinusoid
c) A half rectified sinusoid
d) A square wave
21. In which configuration does the op-amp function as a high gain amplifier?
a) Differential amplifier
b) Inverting amplifier
c) Non-inverting amplifier
d) All of the mentioned
22. What will be the voltage drop across the source resistance of differential amplifier when connected in open loop configuration?
a) Zero
b) Infinity
c) One
d) Greater than one
23. A differential amplifier has a differential gain of 10,000.CMRR=80 dB The common mode gain is given by
a) 1
b) 1/2
c) 2
d) 0
24. The first pole encountered in the frequency response of a compensated OP-AMP is approximately at
a) 5 Hz
b) 10 kHz
c) 1 MHz
d) 100 MHz
25. A 741 OP-AMP has a gain-bandwidth product of 1 MHz. A non-inverting amplifier using this OP-AMP and having a voltage gain of 20 dB will exhibit a -3 dB bandwidth of
a) 50 kHz
b) 100 kHz
c) 100/17 kHz
d) 1000/7.07 kHz
Answers: 1.c 2.c 3.a 4.a 5. b 6.c 7.b 8.a 9.c 10.c 11.c 12.a 13.d 14.c 15.d 16.c 17.a 18.a 19.0a 20.d 21.d 22.a 23.a 24.a 25.b
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