MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 76 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For applications where measurement of a physical quantity is involved, ______ type op-amp circuit is recommended. |
| A. | basic non-inverting amplifier |
| B. | an instrumentation amplifier |
| C. | a comparator |
| D. | an active filter |
| Answer» C. a comparator | |
| 52. |
If an input impedance of op-amp is finite, then which one of the following statements related to the virtual ground is correct? |
| A. | Virtual ground conditions may exist. |
| B. | Virtual ground conditions cannot exist. |
| C. | In the case of an op-amp, the virtual ground condition always exists. |
| D. | Cannot make a valid declaration. |
| Answer» C. In the case of an op-amp, the virtual ground condition always exists. | |
| 53. |
Direction: It consists of two statements, one labeled as ‘Statement (I)’ and the others as ‘Statement (II)’. You are to examine these two statements carefully and select the answer using the codes given below:Statement (I): Chopper-stabilized amplifier amplifies direct currents with large gain and excellent dc stability.Statement (II): The amplifier is ac coupled and provides very high resistance to direct current. |
| A. | Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I) |
| B. | Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) |
| C. | Statement (I) is true but Statement (II) is false |
| D. | Statement (I) is false but Statement (II) is true |
| Answer» B. Both Statement (I) and Statement (II) are individually true but Statement (II) is NOT the correct explanation of Statement (I) | |
| 54. |
A 741 Op-Amp has: |
| A. | 8 pins |
| B. | 9 pins |
| C. | 7 pins |
| D. | 6 pins |
| Answer» B. 9 pins | |
| 55. |
An OPAMP RC phase shift oscillator has three pairs of R and C (R = 22 kΩ, C = 10 pF). Find the frequency of oscillation. |
| A. | 356.12 kHz |
| B. | 312.98 kHz |
| C. | 512.62 kHz |
| D. | 295.34 kHz |
| Answer» E. | |
| 56. |
A non-inverting amplifier (in a closed loop) incorporates an op-amp having a gain of 1000. If the nominal gain is 5 then the gain error of the circuit will be: |
| A. | 5000% |
| B. | 5% |
| C. | 50% |
| D. | 0.5% |
| Answer» E. | |
| 57. |
In an Op-Amp. The use of negative feedback increases |
| A. | The frequency response |
| B. | Stability of amplification |
| C. | Gain |
| D. | None of the above stated |
| Answer» C. Gain | |
| 58. |
Find the voltage VN for the circuit shown below? |
| A. | 6 V |
| B. | 4 V |
| C. | 5 V |
| D. | 3 V |
| Answer» E. | |
| 59. |
In the given Opamp circuit find the current Io |
| A. | 0.1 mA |
| B. | 0.5 mA |
| C. | 0.4 mA |
| D. | 0.3 mA |
| Answer» C. 0.4 mA | |
| 60. |
Consider the following circuit and find the value of the input resistance Rid. |
| A. | 2R1 + R2 |
| B. | 2R1 |
| C. | 2(R1 + R2) |
| D. | Infinite |
| Answer» C. 2(R1 + R2) | |
| 61. |
A second-order RC lowpass filter is using OPAMP and two pairs of R and C. If the cutoff frequency is 2.2 kHz, and the value of capacitance is 22 nF, find the value of R. |
| A. | 4.7 k |
| B. | 3.3 k |
| C. | 2.2 k |
| D. | 1.0 k |
| Answer» C. 2.2 k | |
| 62. |
Find the high cut-off frequency of second-order filter as shown in the figure below: |
| A. | 1128 Hz |
| B. | 1028 Hz |
| C. | 1228 Hz |
| D. | 1528 Hz |
| Answer» B. 1028 Hz | |
| 63. |
An op-amp based inverting amplifier with a gain of 100 and feedback resistance of 47 kΩ, the op-amp input offset voltage is 6 mV and input bias current is 500 nA. The output offset voltage due to an input offset voltage and an input bias current, are |
| A. | 300 mV and 23.5 mV |
| B. | 606 mV and 47.0 mV |
| C. | 300 mV and 47.0 mV |
| D. | 606 mV and 23.5 mV |
| Answer» E. | |
| 64. |
In the given circuit for R1 = 200 kΩ and Rf = 500 kΩ, the output voltage V0 for V1 =2 will be: |
| A. | -10V |
| B. | +5 V |
| C. | -5V |
| D. | +10 V |
| Answer» D. +10 V | |
| 65. |
For which of the following reasons, DC level shifting is required in op-amps |
| A. | Because of the multiple gain stages used in an op-amp |
| B. | For measuring input bias current |
| C. | To realize universal filters |
| D. | To provide buffering action |
| Answer» B. For measuring input bias current | |
| 66. |
If the differential voltage gain and the common mode voltage gain of a differential Amplifier are 48 dB and 2 dB respectively, then its common mode rejection ratio is |
| A. | 23 dB |
| B. | 25 dB |
| C. | 46 dB |
| D. | 50 dB |
| Answer» D. 50 dB | |
| 67. |
Active load is primarily used in the collector of the differential amplifier of an OPAMP |
| A. | To increase the output resistance |
| B. | To increase the differential gain A |
| C. | To handle large signals |
| D. | To provide symmetry |
| Answer» C. To handle large signals | |
| 68. |
For on OPAMP the average temperature coefficient of offset is 6μV/°C. For operation from 25°C to 45°C with a gain of 10, find total offset voltage change is ________. |
| A. | 2.64 mV |
| B. | 1.2 mV |
| C. | 6.6 mV |
| D. | 2 mV |
| Answer» C. 6.6 mV | |
| 69. |
An op-amp, having a slew rate of 62.8 V/μsec is connected in a voltage follower configuration. If the maximum amplitude of the input sinusoidal is 10 V, then the minimum frequency at which the slew rate limited distortion would set in at the output is |
| A. | 62.8 MHZ |
| B. | 6.28 MHz |
| C. | 10 MHz |
| D. | 1.0 MHz |
| Answer» E. | |
| 70. |
For an instrumentation amplifier, the following parameters are given(a) High input resistance and low power consumption(b) Low input resistance and low power consumption(c) High CMRR and high slew rate(d) Low CMRR and high slew rateWhich of the given parameters are a major requirement for an instrumentation amplifier? |
| A. | (a) and (d) |
| B. | (b) and (c) |
| C. | (a) and (c) |
| D. | (c) and (d) |
| Answer» D. (c) and (d) | |
| 71. |
In the circuit shown here, find the value of R such that V2 = 0.5V3 – 2V1 |
| A. | 75 kΩ |
| B. | 25 kΩ |
| C. | 50 kΩ |
| D. | 100 kΩ |
| Answer» D. 100 kΩ | |
| 72. |
Consider the constant current source shown in the figure below. Let |
| A. | \({{\rm{I}}_0} = \left( {\frac{{{\rm{\beta }} + 1}}{{\rm{\beta }}}} \right)\frac{{{{\rm{V}}_{{\rm{ref}}}}}}{{\rm{R}}}{\rm{\;}}\) |
| B. | \({{\rm{I}}_0} = \left( {\frac{{\rm{\beta }}}{{{\rm{\beta }} + 1}}} \right)\frac{{{{\rm{V}}_{{\rm{ref}}}}}}{{\rm{R}}}{\rm{\;\;}}\) |
| C. | \({{\rm{I}}_0} = \left( {\frac{{{\rm{\beta }} + 1}}{{\rm{\beta }}}} \right)\frac{{{{\rm{V}}_{{\rm{ref}}}}}}{{2{\rm{R}}}}\) |
| D. | \({{\rm{I}}_0} = \left( {\frac{{\rm{\beta }}}{{{\rm{\beta }} + 1}}} \right)\frac{{{{\rm{V}}_{{\rm{ref}}}}}}{{2{\rm{R}}}}\) |
| Answer» C. \({{\rm{I}}_0} = \left( {\frac{{{\rm{\beta }} + 1}}{{\rm{\beta }}}} \right)\frac{{{{\rm{V}}_{{\rm{ref}}}}}}{{2{\rm{R}}}}\) | |
| 73. |
A differential amplifier has a differential gain of 20,000 and CMRR is 80 dB. The common-mode gain is given by |
| A. | 2 |
| B. | 1 |
| C. | 0.5 |
| D. | 25 |
| Answer» B. 1 | |
| 74. |
In the given circuit D1 and D2 are 5.1 V and 6.2 V Zener diodes respectively with a forward voltage of 0.7 V and knee current of 1 mA. If Vin = 5 V, what will be the output voltage (Vout)? |
| A. | - 6.9 V |
| B. | - 5.8 V |
| C. | 5.8 V |
| D. | 6.9 V |
| Answer» C. 5.8 V | |
| 75. |
An operation amplifier should preferably have |
| A. | Low output impedance |
| B. | High output impedance |
| C. | Infinite impedance |
| D. | Impedance is insignificant |
| Answer» B. High output impedance | |
| 76. |
If an op-amp is having specified signal bandwidth (BW) of 1 MHz and a closed-loop gain ACL = 200 V/mV, the cut off frequency fc will be |
| A. | 25 Hz |
| B. | 15 Hz |
| C. | 5 Hz |
| D. | 1 Hz |
| Answer» D. 1 Hz | |