MCQOPTIONS
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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 9201. |
In which of the following frequency bands are the standard AM radio broadcast stations? |
| A. | MF |
| B. | HF |
| C. | VHF |
| D. | UHF |
| Answer» E. | |
| 9202. |
If carrier is modulated by a digital bit stream having one of the possible phases of 0 , 90 , 180 , and 270 , then modulation is called |
| A. | BPSK |
| B. | QPSK |
| C. | QAM |
| D. | MSK |
| Answer» C. QAM | |
| 9203. |
Johnson noise is |
| A. | white for all Practical application |
| B. | always white |
| C. | depends on temperature |
| D. | never white |
| Answer» B. always white | |
| 9204. |
For real and odd signals, the Fourier series coefficient an is |
| A. | purely imaginary |
| B. | purely real and even |
| C. | purely imaginary and odd |
| D. | purely real and odd |
| Answer» C. purely imaginary and odd | |
| 9205. |
An amplitude modulated wave is |
| A. | 0.5 |
| B. | 0.3 |
| C. | 0.7 |
| D. | 0.4 |
| Answer» B. 0.3 | |
| 9206. |
The efficiency of a horn speaker is about |
| A. | 10% |
| B. | 40% |
| C. | 60% |
| D. | 80% |
| Answer» C. 60% | |
| 9207. |
If A = 20 and B = - 7 in PASCAL, A mod B = |
| A. | 6 |
| B. | 2 |
| C. | - 1 |
| D. | 3 |
| Answer» B. 2 | |
| 9208. |
Which of the following is unlikely to happen when quantising noise is decreased in PCM? |
| A. | Increased bandwidth |
| B. | Increased channel noise |
| C. | Increased number of standard levels |
| D. | All of the above |
| Answer» E. | |
| 9209. |
In |
| A. | 2's complement |
| B. | 1's complement |
| C. | binary |
| D. | none of the above |
| Answer» B. 1's complement | |
| 9210. |
The block diagram of AM transmitter in which high level modulation is used as shown in figure. The block X could be |
| A. | audio power amplifier |
| B. | buffer RF amplifier |
| C. | compressor amplifier |
| D. | none of the above |
| Answer» C. compressor amplifier | |
| 9211. |
In FM 'guard band' is provided |
| A. | to limit upper frequency limit |
| B. | to limit lower frequency limit |
| C. | so that there is less adjacent channel interference |
| D. | to limit transmitted power of a station |
| Answer» D. to limit transmitted power of a station | |
| 9212. |
Assertion (A): FM requires more bandwidth than AM Reason (R): Wide band FM is used for broadcast transmissions. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 9213. |
A frequency doubler has an FM signal input at 13 MHz with a deviation of 5 kHz. The output, frequency for the carrier will be |
| A. | 26 MHz |
| B. | 26.1 MHz |
| C. | 10 kHz |
| D. | 160 kHz |
| Answer» E. | |
| 9214. |
Which of the following is not a valid real constant in C? |
| A. | 426 |
| B. | 321.0 |
| C. | -621.231 |
| D. | +201.2314 |
| Answer» B. 321.0 | |
| 9215. |
Which of the following is not a valid integer constant in C (for 16 bit)? |
| A. | 321 |
| B. | -162 |
| C. | -65321 |
| D. | +1 |
| Answer» D. +1 | |
| 9216. |
Which of the following is not an integer constant? |
| A. | 0 |
| B. | -8 |
| C. | +1074 |
| D. | -8.1 |
| Answer» E. | |
| 9217. |
Which of the following is a computer language? |
| A. | MS WORD |
| B. | Page maker |
| C. | MS EXCEL |
| D. | LISP |
| Answer» E. | |
| 9218. |
Let JCOKE = 98 and LPEPSI = 42 Consider the statement |
| A. | 103 |
| B. | 106 |
| C. | 109 |
| D. | none of the above |
| Answer» B. 106 | |
| 9219. |
Which of the following DO statements is invalid in FORTRAN 77? |
| A. | DO 161 = 1, 15 |
| B. | DO 16 1 = 1, 10, 1 |
| C. | DO 16 I = - 5, 5, 2 |
| D. | none of the above |
| Answer» E. | |
| 9220. |
Consider the following DO statement in Fortran 77 |
| A. | 1 |
| B. | 10 |
| C. | 3 |
| D. | 4 |
| Answer» E. | |
| 9221. |
The number of noise sources in a BJT are |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 4 |
| Answer» B. 2 | |
| 9222. |
Which of the following is invalid in Basic? |
| A. | A ** B + - C |
| B. | A ** B - C |
| C. | A * B - C |
| D. | A * B - C ** D |
| Answer» B. A ** B - C | |
| 9223. |
Read the following statements about files in Pascal
|
| A. | All |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» B. 1 and 2 only | |
| 9224. |
Consider the following C program int ram
|
| A. | All |
| B. | 1, 2, 3 only |
| C. | 2, 3, 4 only |
| D. | 1, 2, 4 only |
| Answer» C. 2, 3, 4 only | |
| 9225. |
EEPROM permits |
| A. | read operation only |
| B. | read and byte erase operations |
| C. | read, byte erase and byte write operations |
| D. | read, byte erase, byte write and chip erase operations |
| Answer» E. | |
| 9226. |
While selecting a memory chip the feature which should be examined is |
| A. | capacity |
| B. | ac characteristics |
| C. | dc characteristics |
| D. | all of the above |
| Answer» E. | |
| 9227. |
Which of the following can not be used as a variable name in C? |
| A. | else |
| B. | coal |
| C. | ram |
| D. | vendy |
| Answer» B. coal | |
| 9228. |
In Java it is possible to have
|
| A. | All |
| B. | 1, 2 and 3 only |
| C. | 1 and 2 only |
| D. | 1, 3 and 4 only |
| Answer» C. 1 and 2 only | |
| 9229. |
A 256 x 4 EPROM has |
| A. | 8 address pins and 4 data pins |
| B. | 8 address pins and 8 data pins |
| C. | 4 address pins and 8 data pins |
| D. | 4 address pins and 4 data pins |
| Answer» B. 8 address pins and 8 data pins | |
| 9230. |
To evaluate X = (A + B + 1.2) * (A + B - C) the sequence of operation is |
| A. | + + + - * = |
| B. | * + + + - = |
| C. | + + - * + = |
| D. | - + + + * = |
| Answer» B. * + + + - = | |
| 9231. |
Non-coherently detection is not possible for |
| A. | PSK |
| B. | ASK |
| C. | FSK |
| D. | both (a) and (c) |
| Answer» B. ASK | |
| 9232. |
Energy content of atmospheric noise |
| A. | does not depend on frequency |
| B. | decreases as frequency is increased |
| C. | increases as frequency is increased |
| D. | either (a) or (c) depending on the temperature |
| Answer» C. increases as frequency is increased | |
| 9233. |
Tracking of extra terrestrial objects requires |
| A. | high transmitting power |
| B. | very sensitive receiver |
| C. | fully steerable antenna |
| D. | all of the above |
| Answer» E. | |
| 9234. |
Assertion (A): Free space does not interfere with normal radiation and propagation of radio waves Reason (R): Free space has no magnetic or gravitational fields. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 9235. |
The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of |
| A. | frequency adjustment |
| B. | frequency interleaving |
| C. | frequency changing |
| D. | frequency amalgamation |
| Answer» C. frequency changing | |
| 9236. |
In colour TV receiver, varactor diode is used for |
| A. | detection |
| B. | rectification |
| C. | tuning |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 9237. |
In standing wave pattern on a transmission line |
| A. | voltage and current nodes coincide |
| B. | voltage and current antinodes coincide |
| C. | voltage nodes and current antinodes as well as current nodes and voltage antinodes coincide |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 9238. |
In the figure |
| A. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/534-934-3.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/534-934-4.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/534-934-5.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/534-934-6.png"> |
| Answer» D. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/534-934-6.png"> | |
| 9239. |
A carrier wave carries information. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9240. |
A telephone exchange has 9000 subscribers. If the number of calls originating at peak time is 10, 000 in one hour, the calling rate is |
| A. | 0.9 |
| B. | 10/9 |
| C. | 0.81 |
| D. | 0.1 |
| Answer» C. 0.81 | |
| 9241. |
Which of the following is the indirect way of FM generation? |
| A. | Reactance bipolar transistor modulator |
| B. | Armstrong modulator |
| C. | Varactor diode modulator |
| D. | Reactance FM modulator |
| Answer» C. Varactor diode modulator | |
| 9242. |
If C is capacity of noisy channel, (bits/s), f is bandwidth Hz and S/N is signal to noise ratio, then |
| A. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/523-621-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/523-621-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/523-621-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/communication-systems/523-621-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/communication-systems/523-621-2.png"> | |
| 9243. |
If the bandwidth is increased by 2, the FM AM (where is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 9244. |
Frequency shift keying is used mostly in |
| A. | telegraphy |
| B. | telephony |
| C. | satellite communication |
| D. | radio transmission |
| Answer» B. telephony | |
| 9245. |
A cordless telephone using separate frequencies for transmission in base and portable units is known as |
| A. | duplex arrangement |
| B. | half duplex arrangement |
| C. | either (a) or (b) |
| D. | neither (a) nor (b) |
| Answer» B. half duplex arrangement | |
| 9246. |
For attenuation of high frequencies we should use |
| A. | shunt capacitance |
| B. | series capacitance |
| C. | inductance |
| D. | resistance |
| Answer» B. series capacitance | |
| 9247. |
A modem is classified as low speed if data rate handled is |
| A. | upto 100 bps |
| B. | upto 250 bps |
| C. | upto 400 bps |
| D. | upto 600 bps |
| Answer» E. | |
| 9248. |
A woofer should be fed from the input through a |
| A. | low pass filter |
| B. | high pass filter |
| C. | band pass filter |
| D. | band stop filter |
| Answer» B. high pass filter | |
| 9249. |
VSB modulation is preferred in TV because |
| A. | it reduces the bandwidth requirement to half |
| B. | it avoids phase distortion at low frequencies |
| C. | it results in better reception |
| D. | none of the above |
| Answer» B. it avoids phase distortion at low frequencies | |
| 9250. |
Which of the following parameters is negligible in transmission lines? |
| A. | R |
| B. | L |
| C. | C |
| D. | G |
| Answer» E. | |
, the output y(t) will be 