MCQOPTIONS
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MCQOPTIONS
This section includes 1475 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
A common-drain amplifier is similar in configuration to which BJT amplifier? |
| A. | common-emitter |
| B. | common-collector |
| C. | common-base |
| D. | common-gate |
| Answer» C. common-base | |
| 52. |
Referring to this figure, calculate Av for yos = 58 S. |
| A. | 7.29 |
| B. | 7.50 |
| C. | 8.05 |
| D. | 8.55 |
| Answer» B. 7.50 | |
| 53. |
Refer to this figure. If Vin = 1 V p-p, the output voltage Vout would be |
| A. | undistorted. |
| B. | clipped on the negative peaks. |
| C. | clipped on the positive peaks. |
| D. | 0 V p-p. |
| Answer» B. clipped on the negative peaks. | |
| 54. |
logea = ________ log10a |
| A. | 2.3 |
| B. | 2.718 |
| C. | e |
| D. | 1.414 |
| Answer» B. 2.718 | |
| 55. |
What is the ratio of the common logarithm of a number to its natural logarithm? |
| A. | 0.435 |
| B. | 2 |
| C. | 2.3 |
| D. | 3.2 |
| Answer» D. 3.2 | |
| 56. |
In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage for frequencies much larger than the cutoff frequency in the low-frequency region? |
| A. | About 0 |
| B. | 45 |
| C. | About 90 |
| D. | None of the above |
| Answer» B. 45 | |
| 57. |
In the ________-frequency region, the capacitive elements of importance are the interelectrode (between terminals) capacitances internal to the active device and the wiring capacitance between the leads of the network. |
| A. | low |
| B. | mid |
| C. | high |
| Answer» D. | |
| 58. |
Which of the following elements is (are) important in determining the gain of the system in the high-frequency region? |
| A. | Interelectrode capacitances |
| B. | Wiring capacitances |
| C. | Miller effect capacitance |
| D. | All of the above |
| Answer» E. | |
| 59. |
The input power to a device is 10,000 W at 1000 V. The output power is 500 W, and the output impedance is 100 . Find the voltage gain in decibels. |
| A. | 30.01 dB |
| B. | 20.0 dB |
| C. | 13.01 dB |
| D. | 3.01 dB |
| Answer» D. 3.01 dB | |
| 60. |
In the input RC circuit of a single-stage BJT, by how much does the base voltage lead the input voltage at the cutoff frequency in the low-frequency region? |
| A. | About 0 |
| B. | 45 |
| C. | About 90 |
| D. | None of the above |
| Answer» C. About 90 | |
| 61. |
Which of the low-frequency cutoffs determined by CS, CC, or CE will be the predominant factor in determining the low-frequency response for the complete system? |
| A. | lowest |
| B. | middle |
| C. | highest |
| D. | None of the above |
| Answer» D. None of the above | |
| 62. |
By what factor does an audio level change if the power level changes from 4 W to 4096 W? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 63. |
Refer to the given figure. The midrange voltage gain of this amplifier is |
| A. | 0.5. |
| B. | 27.7. |
| C. | 11. |
| D. | 1. |
| Answer» E. | |
| 64. |
This circuit is an example of a ________. |
| A. | single-ended input |
| B. | double-ended (differential) input |
| C. | double-ended output |
| D. | common-mode operation |
| Answer» C. double-ended output | |
| 65. |
A(n) ________ amplifier configuration has a higher input impedance and a lower output impedance than the op-amp itself. |
| A. | non-inverting |
| B. | inverting |
| C. | voltage-follower |
| Answer» B. inverting | |
| 66. |
In which of the following operations is the resulting output signal of the differential amplifier near zero? |
| A. | Single-ended |
| B. | Double-ended |
| C. | Common-mode |
| D. | None of the above |
| Answer» D. None of the above | |
| 67. |
A three-stage op-amp can have a maximum phase lag of ________ . |
| A. | 180 |
| B. | 90 |
| C. | 270 |
| D. | none of the above |
| Answer» D. none of the above | |
| 68. |
Calculate the output impedance of an inverting op-amp using the 741 op-amp (ro = 75 , AOL = 200 V/mV) if R1 = 100 and Rf = 1 k. |
| A. | 0.011 |
| B. | 0.00375 |
| C. | 0.0375 |
| D. | 0.375 |
| Answer» C. 0.0375 | |
| 69. |
The input offset voltage drift is a parameter directly related to VOS and ________. |
| A. | I |
| B. | <sub>D</sub> |
| C. | power dissipation |
| D. | temperature |
| E. | phase shift |
| Answer» D. temperature | |
| 70. |
What is the difference voltage if the inputs are an ideal opposite signal? |
| A. | The differential gain times twice the input signal. |
| B. | The differential gain times the input signal. |
| C. | The common-mode gain times twice the input signal. |
| D. | The common-mode gain times the input signal. |
| Answer» B. The differential gain times the input signal. | |
| 71. |
Refer to the given figure. Determine the bandwidth. |
| A. | 1 MHz |
| B. | 1.5 MHz |
| C. | 1 kHz |
| D. | 1.5 kHz |
| Answer» C. 1 kHz | |
| 72. |
Refer to the given figure. This amplifier is known as |
| A. | an inverting amplifier. |
| B. | a non-inverting amplifier. |
| C. | a voltage-follower. |
| D. | a common-source amplifier. |
| Answer» B. a non-inverting amplifier. | |
| 73. |
Refer to the given figure. The op-amp has a unity-gain bandwidth of 3 MHz. Determine the BW of the circuit. |
| A. | 3 MHz |
| B. | 30 kHz |
| C. | 112.4 kHz |
| D. | infinite in width |
| Answer» D. infinite in width | |
| 74. |
A practical op-amp has very ________ input impedance, very ________ output impedance, very ________ open-loop voltage gain, and a ________ bandwidth. |
| A. | high, low, high, wide |
| B. | high, high, low, narrow |
| C. | low, high, high, wide |
| D. | low, low, low, wide |
| Answer» B. high, high, low, narrow | |
| 75. |
This circuit is referred to as a(n) ________. |
| A. | inverting amplifier |
| B. | noninverting amplifier |
| C. | unity follower |
| D. | integrator |
| Answer» B. noninverting amplifier | |
| 76. |
This circuit is an example of a ________. |
| A. | single-ended input |
| B. | double-ended (differential) input |
| C. | double-ended output |
| D. | common-mode operation |
| Answer» D. common-mode operation | |
| 77. |
What is the level of the roll-off in most op-amps? |
| A. | 6 dB / decade |
| B. | 20 dB / octave |
| C. | 6 dB / decade or 20 dB / octave |
| D. | 20 dB / decade or 6 dB / octave |
| Answer» E. | |
| 78. |
Refer to the given figure. This amplifier is known as |
| A. | an inverting amplifier. |
| B. | a non-inverting amplifier. |
| C. | a voltage-follower. |
| D. | a common-source amplifier. |
| Answer» D. a common-source amplifier. | |
| 79. |
Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV. |
| A. | 1.5 V |
| B. | 1.5 V |
| C. | 0.5 V |
| D. | 0.5 V |
| Answer» B. 1.5 V | |
| 80. |
If Rf = R1, the voltage gain is ________. |
| A. | 1 |
| B. | 1 |
| C. | 10 |
| D. | very small |
| Answer» C. 10 | |
| 81. |
The maximum rate of change of the output voltage in response to a step input voltage is the ________ of an op-amp. |
| A. | time constant |
| B. | maximum frequency |
| C. | slew rate |
| D. | static discharge |
| Answer» D. static discharge | |
| 82. |
An RC network has R = 47 k and C = 0.22 F. What is the cutoff frequency? |
| A. | 154 Hz |
| B. | 1540 Hz |
| C. | 1.54 Hz |
| D. | 15.4 Hz |
| Answer» E. | |
| 83. |
A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB? |
| A. | 51.7 dB |
| B. | 103.5 dB |
| C. | 150,000 dB |
| D. | 5.18 dB |
| Answer» C. 150,000 dB | |
| 84. |
An IC unit made using both ________ and ________ transistors is called a ________ circuit. |
| A. | bipolar, MOSFET, BiFET |
| B. | bipolar, MOSFET, BiMOS |
| C. | TTL, MOSFET, TailFET |
| Answer» C. TTL, MOSFET, TailFET | |
| 85. |
What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms? |
| A. | 5 V/ms |
| B. | 3 V/ms |
| C. | 2 V/ms |
| D. | 1 V/ms |
| Answer» B. 3 V/ms | |
| 86. |
The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations. |
| A. | non-inverting |
| B. | inverting |
| C. | voltage-follower |
| Answer» D. | |
| 87. |
This circuit is referred to as a(n) ________. |
| A. | inverting amplifier |
| B. | noninverting amplifier |
| C. | differentiator |
| D. | integrator |
| Answer» E. | |
| 88. |
Refer to the given figure. Calculate the bandwidth. |
| A. | 8.33 MHz |
| B. | 833 kHz |
| C. | 83.3 kHz |
| D. | 8.33 kHz |
| Answer» D. 8.33 kHz | |
| 89. |
Refer to this figure. The purpose of R4 is |
| A. | for bias current compensation. |
| B. | for input offset voltage compensation. |
| C. | to set input impedance. |
| D. | to set input impedance and voltage gain. |
| Answer» C. to set input impedance. | |
| 90. |
Refer to the given figure. Find the midrange gain of this amplifier. |
| A. | 26.7 |
| B. | 26.7 |
| C. | 27.7 |
| D. | 27.7 |
| Answer» C. 27.7 | |
| 91. |
The summing amplifier contains an inverting amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 92. |
What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp? |
| A. | 200,000 |
| B. | 50,000 |
| C. | 200 |
| D. | 1 |
| Answer» E. | |
| 93. |
Calculate the overall voltage gain of the circuit if R1 = 100 and Rf = 1 k. |
| A. | 1 |
| B. | 10 |
| C. | 11 |
| D. | 9 |
| Answer» D. 9 | |
| 94. |
Refer to the given figure. A dc input signal of 50 mV is applied. You would measure ________ from the inverting input to ground. |
| A. | 50 mV |
| B. | 1.05 V |
| C. | 1.05 V |
| D. | 50 mV |
| Answer» E. | |
| 95. |
What is the level of the voltage between the input terminals of an op-amp? |
| A. | Virtually zero |
| B. | 5 V |
| C. | 18 V |
| D. | 22 V |
| Answer» B. 5 V | |
| 96. |
An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by |
| A. | 10 dB. |
| B. | 6 dB. |
| C. | 20 dB. |
| D. | 3 dB. |
| Answer» D. 3 dB. | |
| 97. |
What is the difference output voltage of any signals applied to the input terminals? |
| A. | The differential gain times the difference input voltage. |
| B. | The common-mode gain times the common input voltage. |
| C. | The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. |
| D. | The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. |
| Answer» D. The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage. | |
| 98. |
An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz. |
| A. | 800 |
| B. | 8,000 |
| C. | 80,000 |
| D. | 100,000 |
| Answer» E. | |
| 99. |
For audio systems, the reference level is generally accepted as ________. |
| A. | 1 mW |
| B. | 1 W |
| C. | 10 mW |
| D. | 100 mW |
| Answer» B. 1 W | |
| 100. |
What is the range of the capacitors Cgs and Cgd? |
| A. | 1 to 10 pF |
| B. | 1 to 10 nF |
| C. | 1 to 10 F |
| D. | 1 to 10 F |
| Answer» B. 1 to 10 nF | |