MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 111 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. |
A 5 mV, 1 kHz sinusoidal signal is applied to the input of an OP-AMP integrator for which R = 100 kΩ and C = 1 μF. The output voltage is: |
| A. | \(\frac{1}{40π} cos(2000πt-1)\) |
| B. | cos (2000 πt - 1) |
| C. | \(-\frac{1}{40π} cos(2000πt-1)\) |
| D. | -cos (2000 πt - 1) |
| Answer» B. cos (2000 πt - 1) | |
| 52. |
In an Op Amp integrator circuit, what is done to, limit the gain at ‘Low Frequencies’? |
| A. | A large resistor is connected in series with the input. |
| B. | A large resistor is connected across the feedback capacitor. |
| C. | A small capacitor is connected in series with the input. |
| D. | A large capacitor is connected across the output. |
| Answer» C. A small capacitor is connected in series with the input. | |
| 53. |
Precision Rectifier can be used as __________ with small modifications. |
| A. | Pulse Width Detector |
| B. | Peak Detector |
| C. | Frequency Detector |
| D. | Phase Detector |
| Answer» C. Frequency Detector | |
| 54. |
An operational amplifier is connected in voltage follower configuration. Input given to this circuit is 3 sin 103πt. Compute the slew rate of operational amplifier. |
| A. | 6π × 10-3 V/μsec |
| B. | 3π × 10-3 V/μsec |
| C. | 1.5π × 10-3 V/μsec |
| D. | π × 10-3 V/μsec |
| Answer» C. 1.5π × 10-3 V/μsec | |
| 55. |
In the given circuit below, what will be the value of V0 ? |
| A. | 8 V |
| B. | 7 V |
| C. | -5 V |
| D. | -4 V |
| Answer» C. -5 V | |
| 56. |
If the input to the circuit of figure is a sine wave, then the output will be: |
| A. | Half wave rectified sine wave |
| B. | A full wave rectified sine wave |
| C. | A square wave |
| D. | A triangular wave |
| Answer» D. A triangular wave | |
| 57. |
A given op-amp has an open loop gain of 110 dB and a CMRR rating of 100 dB. What should be the open loop common mode gain of this op-amp ? |
| A. | 1.10 dB |
| B. | 10 dB |
| C. | 210 dB |
| D. | 105 dB |
| Answer» C. 210 dB | |
| 58. |
Low-pass filter circuit is basically |
| A. | differentiating circuit with low time constant |
| B. | differentiating circuit with larger time constant |
| C. | an integrating circuit with low time constant |
| D. | an integrating circuit with large time constant. |
| Answer» E. | |
| 59. |
An astable multivibrator has: |
| A. | one quasi-stable state |
| B. | two quasi-stable states |
| C. | one stable states |
| D. | two stable states |
| Answer» C. one stable states | |
| 60. |
An Op-Amp can be connected to provide1. Voltage controlled current source2. Current controlled voltage source3. Current controlled current sourceWhich of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1 and 3 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» E. | |
| 61. |
For the circuit shown below, assume that the OPAMP is ideal.Which one of the following is TRUE? |
| A. | Vo = Vs |
| B. | Vo = 1.5 Vs |
| C. | Vo = 2.5 Vs |
| D. | Vo = 5 Vs |
| Answer» D. Vo = 5 Vs | |
| 62. |
In the circuit shown below, what is the function of the inductor? |
| A. | high bass filter |
| B. | low pass filter |
| C. | band pass filter |
| D. | band stop filter |
| Answer» C. band pass filter | |
| 63. |
An amplifier using an Op-Amp with a slew rate SR = 1 V/μ sec has a gain of 40 dB. If this amplifier has to faithfully amplify sinusoidal signals from 10 to 20 kHz, without introducing any slew rate induced distortion, then the input signal level must not exceed. |
| A. | 795 mV |
| B. | 395 mV |
| C. | 79.5 mV |
| D. | 39.5 mV |
| Answer» D. 39.5 mV | |
| 64. |
In an Op-Amp, if the feedback voltage is reduced by connecting a voltage divider at the output, which of the following will happen1. Input impedance increases2. Output impedance reduces3. Overall gain increasesWhich of the above statements is/are correct? |
| A. | 1 only |
| B. | 2 only |
| C. | 3 only |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 65. |
Negative feedback in amplifier: |
| A. | Increase stability |
| B. | Increases noise |
| C. | Increases frequency distortion |
| D. | Increases gain |
| Answer» B. Increases noise | |
| 66. |
Poles of Butterworth and Chebyshev low pass filters are located on _____ and _____ respectively in s-plane. |
| A. | Ellipse, circle |
| B. | Circle, ellipse |
| C. | Circle, circle |
| D. | Standard ellipse, tilted ellipse |
| Answer» C. Circle, circle | |
| 67. |
Calculate the expression of output voltage for the given circuit: |
| A. | 41 (V1 - V2) |
| B. | 11 (V2 - V1) |
| C. | 11 (V1 - V2) |
| D. | 41 (V2 - V1) |
| Answer» B. 11 (V2 - V1) | |
| 68. |
Assuming that the Op-amp in the circuit shown is ideal, Vo is given by |
| A. | \(\frac{5}{2}{V_1} - 3{V_2}\) |
| B. | \(2{V_1} - \frac{5}{2}{V_2}\) |
| C. | \(- \frac{3}{2}{V_1} + \frac{7}{2}{V_2}\) |
| D. | \(- 3{V_1} + \frac{{11}}{2}{V_2}\) |
| Answer» E. | |
| 69. |
As the Common mode voltage gain decreases, the CMRR ________. |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | become 0 |
| Answer» C. remains the same | |
| 70. |
A circuit that uses an amplifier with passive filter elements is called a (n) |
| A. | Relaxation oscillator |
| B. | Signal generator |
| C. | Active filter |
| D. | Differential amplifier |
| Answer» D. Differential amplifier | |
| 71. |
An operational amplifier has a slew rate of 2 V/μ sec. If the peak output is 12 V, what will be the power bandwidth? |
| A. | 36.5 kHz |
| B. | 26.5 kHz |
| C. | 22.5 kHz |
| D. | 12.5 kHz |
| Answer» C. 22.5 kHz | |
| 72. |
In Amplifier, the slew rate is expressed as _______. |
| A. | I/s |
| B. | V/μs |
| C. | R/s |
| D. | V |
| Answer» C. R/s | |
| 73. |
An OPAMP has a slew rate of 5 V/μs. The largest sine wave output voltage possible at a frequency of 1 MHz is: |
| A. | 10 πV |
| B. | 5 V |
| C. | \(\frac{5}{\Pi }\)V |
| D. | \(\frac{5}{2\Pi }\)V |
| Answer» E. | |
| 74. |
For given op-amp circuit, consider infinite input resistance and zero output resistance. If A =100 loop gain then what will be the closed loop gain ? |
| A. | 0.99 |
| B. | 0.25 |
| C. | 0.7 |
| D. | 0.11 |
| Answer» B. 0.25 | |
| 75. |
An operational-amplifier circuit is shown in the figure.The output of the circuit for a given input v1 is |
| A. | \(- \left( {\frac{{{R_2}}}{{{R_1}}}} \right){v_i}\) |
| B. | \(- \left( {1 + \frac{{{R_2}}}{{{R_1}}}} \right){v_i}\) |
| C. | \(\left( {1 + \frac{{{R_2}}}{{{R_1}}}} \right){v_i}\) |
| D. | + Vsat or - Vsat |
| Answer» E. | |
| 76. |
A 10 kHz even-symmetric square wave is passed through a bandpass filter the centre frequency at 30 kHz and 3 dB passband of 6 kHz. The filter output is |
| A. | a highly attenuated square wave at 10 kHz |
| B. | nearly zero |
| C. | a nearly perfect cosine wave at 30 kHz |
| D. | a nearly perfect sine wave at 30 kHz |
| Answer» D. a nearly perfect sine wave at 30 kHz | |
| 77. |
For an op-amp, CMRR = 103 and differential gain Ad = 103. Determine the common mode Acm gain of the op-amp? |
| A. | 1 |
| B. | 0.1 |
| C. | 10 |
| D. | 1000 |
| Answer» B. 0.1 | |
| 78. |
In an OPAMP inverting amplifier, the feedback r is 22 kΩ and the input resistance is 10 kΩ. Find the output voltage if the input is 2 V. |
| A. | -3.6 V |
| B. | -4.4 V |
| C. | -2.2 V |
| D. | +4.4 V |
| Answer» C. -2.2 V | |
| 79. |
Clamp diodes used in comparators ______ |
| A. | To protect the op-amp from damage. |
| B. | To develop the input offset current |
| C. | To increase the output voltage |
| D. | To increase the gain of op-amp. |
| Answer» B. To develop the input offset current | |
| 80. |
An amplifier has voltage gain and current gain of 10 and 100 respectively. The voltage, current and power gain in decibels, respectively, will be: |
| A. | 12. 16 and 20 dB |
| B. | 20, 40 and 30 dB |
| C. | 10, 100 and 1000 dB |
| D. | 40, 60 and 50 dB |
| Answer» C. 10, 100 and 1000 dB | |
| 81. |
A 100 pF capacitor has a maximum charging current of 150 μA. What is the slew rate of capacitor? |
| A. | 1.50 V/s |
| B. | 0.67 V/μs |
| C. | 0.67 V/s |
| D. | 1.50 V/μs |
| Answer» E. | |
| 82. |
Consider the circuit with and ideal OPAMP shown in the figure.Assuming |VIN| |
| A. | VIN = 0.5 VREF |
| B. | VIN = VREF |
| C. | VIN = 2VREF |
| D. | VIN = 2 + VREF |
| Answer» C. VIN = 2VREF | |
| 83. |
An ideal filter should have |
| A. | Infinite attenuation in the attenuation band |
| B. | Infinite attenuation in the pass band |
| C. | Zero attenuation in the attenuation band |
| D. | Zero attenuation in the pass band |
| Answer» E. | |
| 84. |
An amplifier circuit has a voltage gain of 500. If the output voltage is 5 V, then the input voltage is: |
| A. | 1 / 2500 V |
| B. | 2500 V |
| C. | 100 mV |
| D. | 10 mV |
| Answer» E. | |
| 85. |
For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by |
| A. | Av+Ac |
| B. | Av/Ac |
| C. | Av + 1/Ac |
| D. | Ac/Av |
| Answer» C. Av + 1/Ac | |
| 86. |
For the circuit shown below, taking the Op-amp as ideal, the output voltage \({V_{out}}\) in terms of the input voltages \({V_1}\;,\;{V_2}\;and\;{V_3}\) is |
| A. | \(8{V_1} + 7.2{V_2}-{V_3}\) |
| B. | \(2{V_1} + 8{V_2}-{V_3}\) |
| C. | \(7.2{V_1} + 1.8{V_2}-{V_3}\) |
| D. | \(8{V_1} + 2{V_2}-9{V_3}\) |
| Answer» E. | |
| 87. |
A system has the transfer function \(\frac{(1-s)}{(1+s)}\) It is known as |
| A. | low pass filter |
| B. | high pass filter |
| C. | all pass filter |
| D. | none of these |
| Answer» D. none of these | |
| 88. |
Consider the following statements:1. A differential amplifier is used at the input stage of an operational amplifier2. Differential amplifiers have very high CMRRWhich of these statements are correct? |
| A. | Both 1 and 2 |
| B. | Neither 1 nor 2 |
| C. | 1 only |
| D. | 2 only |
| Answer» B. Neither 1 nor 2 | |
| 89. |
Consider the following statements:1) Two identical 2nd order Butterworth LP filters when connected in cascade will make a 4th order Butterworth LP filter.2) A high 2nd order filter will exhibit a peak if Q exceeds a certain value.3) A bandpass filter cannot be of order one.4) A network consists of an amplifier of real gain A and a β network in cascade with each other. The network will generate sinusoidal oscillations if the β network is a first-order LP filter.Which of the above statements are correct? |
| A. | 1 and 2 |
| B. | 2 and 3 |
| C. | 3 and 4 |
| D. | 1 and 4 |
| Answer» C. 3 and 4 | |
| 90. |
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 10V, then the minimum frequency a which the slew rate limited distortion would set in at the output is |
| A. | 1.0 MHz |
| B. | 6.28 MHz |
| C. | 10 MHz |
| D. | 62.8 MHz |
| Answer» B. 6.28 MHz | |
| 91. |
In a second-order digital notch filter having a notch frequency of 60 Hz and a 3-dB notch bandwidth of 6 Hz and sampling frequency employed is 400 Hz. The normalized angular notch frequency ωo and the normalized angular 3-dB bandwidth Δω3 dB are |
| A. | 0.3π and 0.03π |
| B. | 0.6π and 0.03π |
| C. | 0.3π and 0.06π |
| D. | 0.6π and 0.06π |
| Answer» B. 0.6π and 0.03π | |
| 92. |
Band Reject filter to reject frequencies between f1 & f2 (f2 > f1) can be constructed by _______. |
| A. | Connecting LPF of fc = f1 followed by HPF of fc = f2 in series |
| B. | Connecting LPF of fc = f2 followed by HPF of fc = f1 in series |
| C. | Connecting LPF of fc = f1 and HPF of fc = f2 in parallel |
| D. | Connecting inputs of both LPF of fc = f1 and HPF of fc = f2 and then summing their outputs |
| Answer» E. | |
| 93. |
For Butterworth & Chebyshev filters, the correct statement is: |
| A. | Butterworth response has a sharp cut-off |
| B. | Chebyshev response has a flat response in the pass band |
| C. | Butterworth response has ripples in the pass band |
| D. | Chebyshev response has ripples in the pass band |
| Answer» E. | |
| 94. |
A high gain OpAmp has Rf = 105 Ω & Ri = 103 Ω. The correct statement is: |
| A. | The non-inverting gain & inverting gain are nearly same. |
| B. | The inverting gain is very much higher than non-inverting gain |
| C. | The non-inverting gain is very much higher than inverting gain |
| D. | The inverting & non-inverting gains are unrelated |
| Answer» B. The inverting gain is very much higher than non-inverting gain | |
| 95. |
An op-amp is used in a notch filter. The notch frequency is 2 kHz, the lower cut-off frequency is 1.8 kHz and the upper cut-off frequency is 2.2 kHz. Then Q of the notch filter is |
| A. | 3.5 |
| B. | 4.0 |
| C. | 4.5 |
| D. | 5.0 |
| Answer» E. | |
| 96. |
Directions: It consists of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer using the codes given below:Statement (I): An astable multivibrator is also called a free-running oscillator.Statement (II): An astable multivibrator circuit forces an operational amplifier to operate in the saturation region. |
| A. | Statement (I) and Statement (II) are individually true and statement (II) is the correct explanation of statement (II) |
| B. | 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» C. Statement (I) is true but statement (II) is false | |
| 97. |
A sinusoidal voltage of 1 V peak is applied at the input of an amplifier which operates at ± 12 V power supplies. A sinusoidal voltage of 10 V peak is available across a 1 kΩ load at the output of the amplifier. The input current to the amplifier from the sinusoidal source is negligible. If the amplifier draws a current of 10 mA from each of the two power supplies, the power dissipated in the amplifier is |
| A. | 50 mW |
| B. | 140 mW |
| C. | 190 mW |
| D. | 240 mW |
| Answer» D. 240 mW | |
| 98. |
For the circuit with and ideal OPAMP shown in the figure. VREF is fixed.If VOUT = 1 for VIN = 0.1 volt and VOUT = 6 volt for VIN = 1 volt, where VOUT is measured across RL connected at the output of this OPAMP, the value of RF / RIN is |
| A. | 3.285 |
| B. | 5.555 |
| C. | 2.860 |
| D. | 3.825 |
| Answer» C. 2.860 | |
| 99. |
In the circuit below, the operational amplifier is ideal. If V1 = 10 mV and V2 = 50 mV, the output voltage (Vout) is |
| A. | 100 mV |
| B. | 400 mV |
| C. | 500 mV |
| D. | 600 mV |
| Answer» C. 500 mV | |
| 100. |
An amplifier with mid-band gain |A| = 500 has negative feedback |b| = 1/100. If the upper cut off frequency without feedback were at 60 kHz, then with feedback it would become |
| A. | 10 kHz |
| B. | 12 kHz |
| C. | 300 kHz |
| D. | 360 kHz |
| Answer» E. | |