MCQOPTIONS
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MCQOPTIONS
This section includes 125 Mcqs, each offering curated multiple-choice questions to sharpen your Analog Communications knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
An FM signal has a carrier swing of 100 kHz when modulating signal has a frequency of 8 kHz. The modulation index is |
| A. | 12.5 |
| B. | 7.5 |
| C. | 6.25 |
| D. | 15 |
| Answer» D. 15 | |
| 102. |
In delta modulation, the quantizer is a |
| A. | 2-bit quantizer |
| B. | 4-bit quantizer |
| C. | 1-bit quantizer |
| D. | none of these |
| Answer» D. none of these | |
| 103. |
If the maximum output voltage of a DAC is V volts and if the resolution is R bits, then the weight of the most significant bit is _____. |
| A. | \(\dfrac{V}{2^R - 1}\) |
| B. | \(\dfrac{(2^{R - 1})V}{(2^R - 1)}\) |
| C. | (2R - 1).V |
| D. | \(\dfrac{V}{(2^{R-1})}\) |
| Answer» C. (2R - 1).V | |
| 104. |
An AM broadcast receiver has an intermediate frequency of 465 KHz and is tuned to 1000 KHz. Radio frequency has one tuned circuit with Q of 50. Calculate image frequency. |
| A. | 1465 KHz |
| B. | 1930 KHz |
| C. | 2000 KHz |
| D. | 1000 KHz |
| Answer» C. 2000 KHz | |
| 105. |
Compared to PPM, the PDM has the disadvantage that it requires |
| A. | a more powerful transmitter |
| B. | pulses of larger widths |
| C. | more samples per second |
| D. | none of these |
| Answer» B. pulses of larger widths | |
| 106. |
Frequency modulated signal with single-tone modulation-has a frequency deviation of 15 kHz and bandwidth of 50 kHz. The frequency of the modulating signal will be |
| A. | 05 kHz |
| B. | 10 kHz |
| C. | 20 kHz |
| D. | 30 kHz |
| Answer» C. 20 kHz | |
| 107. |
Consider the following formulas with all the symbols having their usual meanings:(a) \({P_t} = {P_c}\left( {1 + \frac{m}{2}} \right)\)(b) \({I_t} = {I_c}{\left( {1 + \frac{{{m^2}}}{2}} \right)^{\frac{1}{2}}}\)(c) \({P_t} = {P_c}\left( {1 + \frac{{{m^2}}}{2}} \right)\)(d) \({I_t} = {I_c}{\left( {1 + \frac{m}{2}} \right)^{\frac{1}{2}}}\)Which of the above are incorrect? |
| A. | (a) and (b) |
| B. | (b) and (c) |
| C. | (c) and (d) |
| D. | (a) and (d) |
| Answer» C. (c) and (d) | |
| 108. |
Luminance refers to ________ |
| A. | contrast |
| B. | diffusion |
| C. | brightness |
| D. | aperture |
| Answer» D. aperture | |
| 109. |
How many lines are there in an NTSC signal? |
| A. | 1024 |
| B. | 1856 |
| C. | 625 |
| D. | 525 |
| Answer» E. | |
| 110. |
RGB stands for ________ |
| A. | Red Green Brown |
| B. | Red Green Black |
| C. | Red Gold Blue |
| D. | Red Green Blue |
| Answer» E. | |
| 111. |
What is the aspect ratio of a standard TV receiver? |
| A. | 3:4 |
| B. | 525:625 |
| C. | 625:525 |
| D. | 4:3 |
| Answer» E. | |
| 112. |
Bluetooth uses ________ |
| A. | CDMA |
| B. | Frequency hopping |
| C. | QPSK |
| D. | QAM |
| Answer» C. QPSK | |
| 113. |
NTSC specifications was drawn up by ________ |
| A. | FCC |
| B. | IBM |
| C. | Cisco |
| D. | EIA |
| Answer» E. | |
| 114. |
Push pull amplifier is a class B amplifier. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 115. |
ISM stands for _________ |
| A. | IEEE Standard Message |
| B. | Industrial, Scientific and Messaging |
| C. | Industrial, Scientific and Medical |
| D. | IEEE Secure Message |
| Answer» D. IEEE Secure Message | |
| 116. |
An antenna has 'gain' as compared to ________ |
| A. | Helical antenna |
| B. | Marconi antenna |
| C. | Vertically polarized radiator |
| D. | Isotropic radiator |
| Answer» E. | |
| 117. |
TDMA stands for ________ |
| A. | Time Division Multiple Access |
| B. | Time Domain Multiple Access |
| C. | Time Division Mutual Access |
| D. | Time Domain Mutual Access |
| Answer» B. Time Domain Multiple Access | |
| 118. |
In digital microwave systems, additional repeaters increase the ________ |
| A. | selectivity |
| B. | noise level |
| C. | jitter |
| D. | sensitivity |
| Answer» D. sensitivity | |
| 119. |
What is the approximate reliability of a microwave system? |
| A. | 0.9 |
| B. | 0.99 |
| C. | 0.9999 |
| D. | 0.9099 |
| Answer» D. 0.9099 | |
| 120. |
Which modulation is used by a microwave system? |
| A. | FM |
| B. | SSB |
| C. | QAM |
| D. | Either FM or SSB or QAM |
| Answer» E. | |
| 121. |
What is the height of the geosynchronous orbit above the equator? |
| A. | 3,578km |
| B. | 35,780km |
| C. | depends on escape velocity |
| D. | depends on satellite velocity |
| Answer» C. depends on escape velocity | |
| 122. |
The 'payload' in a communication satellite consists of _________ |
| A. | power amplifiers |
| B. | batteries |
| C. | transponders |
| D. | transducers |
| Answer» D. transducers | |
| 123. |
Find the carrier frequency if the inductance and capacitance are 30µH and 10nF respectively? |
| A. | 244KHz |
| B. | 523KHz |
| C. | 290KHZ |
| D. | 300KHz |
| Answer» D. 300KHz | |
| 124. |
The 'forward' PCs channel is ________ |
| A. | from the base to mobile |
| B. | from the mobile to base |
| C. | from mobile to mobile |
| D. | from base to base |
| Answer» B. from the mobile to base | |
| 125. |
LNA stands for __________ |
| A. | low noise amplifier |
| B. | low noise amplification |
| C. | low narrow amplification |
| D. | low narrow amplifier |
| Answer» B. low noise amplification | |