MCQOPTIONS
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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.
| 101. |
In the circuit shown below, the input voltage Vin in positive. The current (I) - voltage (V) characteristics of the diode can be assumed to be I = I0eV/VT under the forward bias condition, where VT is the thermal voltage and I0 is the reverse saturation current. Assuming an ideal op-amp, the output voltage Vout of the circuit is proportional to |
| A. | loge (Vin/VT) |
| B. | 2Vin |
| C. | \({e^{{V_{in}}/{V_T}}}\) |
| D. | \(V_{in}^2\) |
| Answer» D. \(V_{in}^2\) | |
| 102. |
Impulse invariance method is not preferred in the design of IIR filter other than low pass filter because of |
| A. | Stability criteria |
| B. | Warping effect |
| C. | Aliasing effect |
| D. | None of the above |
| Answer» D. None of the above | |
| 103. |
A comparator circuit is used to |
| A. | Mark the instant when an arbitrary waveform attains some reference level |
| B. | Mark the instant when the input voltage becomes constant |
| C. | Switch ON and OFF a circuit alternately at a particular rate |
| D. | Switch OFF a circuit when output becomes zero |
| Answer» B. Mark the instant when the input voltage becomes constant | |
| 104. |
An opamp has ideal characteristics except that its open loop gain is given by the expression AV(s) = 104 / (1 + 10–3s). This op-amp is used in the circuit shown in the figure. The 3-dB bandwidth of the circuit, in rad/s, is |
| A. | 102 |
| B. | 103 |
| C. | 104 |
| D. | 106 |
| Answer» E. | |
| 105. |
For the operational amplifier circuit shown, the output saturation voltages are ± 15V. The upper and lower threshold voltages for the circuit are, respectively. |
| A. | +5 V and -5 V |
| B. | +7 V and -3 V |
| C. | +3 V and -7 V |
| D. | +3 V and -3 V |
| Answer» C. +3 V and -7 V | |
| 106. |
A filter circuit which transmits all the frequencies without any attenuation, but provides some phase shift between input and output signals is called: |
| A. | Low pass filter |
| B. | High pass filter |
| C. | Band pas filter |
| D. | All pass filter |
| Answer» E. | |
| 107. |
For designing a multirate LPF with passband 0 to 50 Hz, stopband 60 to 280 Hz, stopband deviation 0.001, pass band deviation 0.01 and sampling frequency (fs) = 400 Hz, what would be the value of normalized transition width? |
| A. | 0.025 Hz |
| B. | 1.25 Hz |
| C. | 1.50 Hz |
| D. | 2.6 Hz |
| Answer» B. 1.25 Hz | |
| 108. |
Determine the order of a low pass filter with Butterworth approximation which has pass band gain of -2 dB for 0 ≤ ω ≤ 10 and stop band gain of -20 dB for ω ≥ 20. |
| A. | 2 |
| B. | 5 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 109. |
An operational amplifier has a time rate of change of voltage of 2 V/μs. If the peak output voltage is 12 V, what is the bandwidth of the amplifier? |
| A. | \(\frac{1}{{12\pi }}\;MHz\) |
| B. | \(\frac{1}{{24\pi }}\;kHz\) |
| C. | \(\frac{1}{{24\pi }}\;MHz\) |
| D. | None of the above |
| Answer» B. \(\frac{1}{{24\pi }}\;kHz\) | |
| 110. |
If an amplifier has a power gain of 100, then its dB gain is |
| A. | 10 |
| B. | 40 |
| C. | 20 |
| D. | 100 |
| Answer» D. 100 | |
| 111. |
An OPAMP has a common mode gain of 0.01 and a differential mode gain of 105. Its common mode rejection ratio would be: |
| A. | 10-7 |
| B. | 10-3 |
| C. | 103 |
| D. | 107 |
| Answer» E. | |