MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 375 Mcqs, each offering curated multiple-choice questions to sharpen your Computer Science Engineering (CSE) knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
When the base of the logarithm is e, the unit of measure of information is |
| A. | bits |
| B. | bytes |
| C. | nats |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 302. |
2 QUANTIZATION |
| A. | true |
| B. | false |
| Answer» C. | |
| 303. |
The mutual information between a pair of events is |
| A. | positive |
| B. | negative |
| C. | zero |
| D. | all of the mentioned |
| Answer» E. | |
| 304. |
If the channel is noiseless information conveyed is        and if it is useless channel information conveyed is |
| A. | 0,0 |
| B. | 1,1 |
| C. | 0,1 |
| D. | 1,0 |
| Answer» E. | |
| 305. |
The output of an information source is |
| A. | random |
| B. | deterministic |
| C. | random & deterministic |
| D. | none of the mentioned |
| Answer» B. deterministic | |
| 306. |
Which conveys more information? |
| A. | high probability event |
| B. | low probability event |
| C. | high & low probability event |
| D. | none of the mentioned |
| Answer» C. high & low probability event | |
| 307. |
Quantization is a            process. |
| A. | few to few mapping |
| B. | few to many mapping |
| C. | many to few mapping |
| D. | many to many mapping |
| Answer» D. many to many mapping | |
| 308. |
Which is a quantization process? |
| A. | rounding |
| B. | truncation |
| C. | rounding & truncation |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 309. |
Spread spectrum is used for |
| A. | encrypting signal |
| B. | hiding signal |
| C. | encrypting & hiding signal |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 310. |
Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%? |
| A. | 100w |
| B. | 800w |
| C. | 500w |
| D. | 900w |
| Answer» E. | |
| 311. |
One of the advantage of using a high frequency carrier wave is that it dissipates very small power. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 312. |
The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A? |
| A. | 50% |
| B. | 30% |
| C. | 28.5% |
| D. | 23% |
| Answer» D. 23% | |
| 313. |
What is the bandwidth required in SSB signal? |
| A. | fm |
| B. | 2fm |
| C. | > 2fm |
| D. | < 2fm |
| Answer» B. 2fm | |
| 314. |
What is number of possible outputs if there is 7 line digital input? |
| A. | 64 |
| B. | 32 |
| C. | 16 |
| D. | 128 |
| Answer» E. | |
| 315. |
Which of the following is not necessarily an advantage of FM over AM? |
| A. | less modulating power is required |
| B. | better noise immunity is provided |
| C. | higher bandwidth is required |
| D. | carrier is of any shape |
| Answer» D. carrier is of any shape | |
| 316. |
The frequency deviation is proportional to frequency in phase modulated signal. |
| A. | true |
| B. | false |
| Answer» C. | |
| 317. |
For a phase modulated signal, the frequency deviation is proportional to |
| A. | frequency only |
| B. | amplitude only |
| C. | only width |
| D. | phase only |
| Answer» C. only width | |
| 318. |
Why frequency fogging is used in a carrier system? |
| A. | to reduce noise |
| B. | to reduce cross talk |
| C. | to converge frequencies |
| D. | to reduce distortion |
| Answer» C. to converge frequencies | |
| 319. |
De-emphasis circuit is used |
| A. | before detection |
| B. | after detection |
| C. | before encoding |
| D. | after encoding |
| Answer» C. before encoding | |
| 320. |
FM can improve the receiver performance through adjustment of transmitted power. |
| A. | true |
| B. | false |
| Answer» C. | |
| 321. |
Which of the following FM demodulator is sometimes known as pulse averaging discriminator? |
| A. | slope detection |
| B. | zero crossing detection |
| C. | quadrature detection |
| D. | phase locked discriminator |
| Answer» C. quadrature detection | |
| 322. |
Which of the following is not a technique for FM demodulation? |
| A. | slope detection |
| B. | zero crossing detection |
| C. | product detector |
| D. | phase locked discriminator |
| Answer» D. phase locked discriminator | |
| 323. |
Which of the following is used to vary the frequency of the carrier frequency in accordance with the baseband signal amplitude variations in direct method of FM generation? |
| A. | integrator |
| B. | envelope detector |
| C. | multivibrator |
| D. | voltage controlled oscillators |
| Answer» E. | |
| 324. |
In indirect method, the carrier frequency is directly varied in accordance with the input modulating signal. |
| A. | true |
| B. | false |
| Answer» C. | |
| 325. |
Which of the following are two methods for generating FM signal? |
| A. | coherent method, noncoherent method |
| B. | product detector, envelope detector |
| C. | direct method, indirect method |
| D. | slope detector, zero crossing detector |
| Answer» D. slope detector, zero crossing detector | |
| 326. |
Frequency modulation index defines the relationship between the              and bandwidth of transmitted signal. |
| A. | frequency of message signal |
| B. | amplitude of message signal |
| C. | amplitude of carrier signal |
| D. | frequency of carrier signal |
| Answer» C. amplitude of carrier signal | |
| 327. |
Frequency modulated signal is regarded as the phase modulated signal in which the modulating wave is differentiated before modulation. |
| A. | true |
| B. | false |
| Answer» C. | |
| 328. |
FM is a part of general class of modulation known as |
| A. | angle modulation |
| B. | phase modulation |
| C. | amplitude modulation |
| D. | frequency modulation |
| Answer» B. phase modulation | |
| 329. |
Half power bandwidth is also called |
| A. | absolute bandwidth |
| B. | null to null bandwidth |
| C. | 3 db bandwidth |
| D. | zero db bandwidth |
| Answer» D. zero db bandwidth | |
| 330. |
               is equal to width of main spectral lobe. |
| A. | null to null bandwidth |
| B. | half power bandwidth |
| C. | 3 db bandwidth |
| D. | absolute bandwidth |
| Answer» B. half power bandwidth | |
| 331. |
Which of the following is defined as the range of frequencies over which the signal has a non zero power spectral density? |
| A. | null to null bandwidth |
| B. | half power bandwidth |
| C. | 3 db bandwidth |
| D. | absolute bandwidth |
| Answer» E. | |
| 332. |
Which of the following is the ratio of the throughput data rate per Hertz? |
| A. | bandwidth efficiency |
| B. | spectral density |
| C. | power efficiency |
| D. | power density |
| Answer» B. spectral density | |
| 333. |
Increasing the data rate implies the increase in pulse width of digital symbol. |
| A. | true |
| B. | false |
| Answer» C. | |
| 334. |
Which of the following is the ratio of signal energy per bit to noise power spectral density? |
| A. | bandwidth efficiency |
| B. | spectral density |
| C. | power efficiency |
| D. | power density |
| Answer» D. power density | |
| 335. |
In digital communication system, in order to increase noise immunity, it is necessary to increase |
| A. | signal power |
| B. | signal amplitude |
| C. | signal frequency |
| D. | signal magnitude |
| Answer» B. signal amplitude | |
| 336. |
Which of the following is not an advantage of digital modulation? |
| A. | greater noise immunity |
| B. | greater security |
| C. | easier multiplexing |
| D. | less bandwidth requirement |
| Answer» E. | |
| 337. |
5 PSD MODULATORS AND DEMODULATORS |
| A. | true |
| B. | false |
| Answer» C. | |
| 338. |
What is the use of Companding? |
| A. | in pcm transmitters to allow amplitude limiting in the receivers |
| B. | in pcm receiver to overcome impulse noise |
| C. | to overcome quantizing noise in pcm |
| D. | to protect small signals in pcm from quantizing distortion |
| Answer» E. | |
| 339. |
Companding is used in PCM transmitters to allow amplitude limiting in the receivers. |
| A. | true |
| B. | false |
| Answer» C. | |
| 340. |
It is only the reflected color that decided the color of an object. |
| A. | true |
| B. | false |
| Answer» C. | |
| 341. |
Which of the following frequency is not transmitted in AM transmission? |
| A. | upper side band frequency |
| B. | carrier frequency |
| C. | lower side band frequency |
| D. | audio frequency |
| Answer» E. | |
| 342. |
Quantization noise depends upon both sampling rate and number of quantization levels. |
| A. | true |
| B. | false |
| Answer» C. | |
| 343. |
In AM pilot carrier, transmission has |
| A. | carrier and part of one side band |
| B. | two side bands and a carrier |
| C. | two side bands |
| D. | carrier, one side band and part of other side band |
| Answer» C. two side bands | |
| 344. |
What the main advantage of PCM? |
| A. | can travel small distances |
| B. | higher bandwidth |
| C. | lower noise |
| D. | good reception |
| Answer» D. good reception | |
| 345. |
Quantization noise occurs in |
| A. | frequency division multiplexing |
| B. | time division multiplexing |
| C. | delta modulation |
| D. | amplitude modulation |
| Answer» E. | |
| 346. |
Inductance and capacitance of a line is 0.8 |
| A. | 158 |
| B. | 166 |
| C. | 143 |
| D. | 127 |
| Answer» B. 166 | |
| 347. |
Which is the greatest disadvantage of Pulse Code Modulation? |
| A. | highly prone to noise |
| B. | cannot travel long distances |
| C. | its inability to handle analog signals |
| D. | large bandwidth is required for it |
| Answer» E. | |
| 348. |
For a low level AM system, amplifier modulated stage must have |
| A. | harmonic devices |
| B. | linear devices |
| C. | non-linear devices |
| D. | class a amplifiers |
| Answer» C. non-linear devices | |
| 349. |
Carrier wave in modulation is a resultant wave. |
| A. | true |
| B. | false |
| Answer» C. | |
| 350. |
What do you understand by the term “carrier†in modulation? |
| A. | voltage to be transmitted |
| B. | resultant wave |
| C. | voltage for which amplitude, phase or frequency can be varied |
| D. | voltage for which amplitude, phase or frequency remains constant |
| Answer» D. voltage for which amplitude, phase or frequency remains constant | |