MCQOPTIONS
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MCQOPTIONS
This section includes 45 Mcqs, each offering curated multiple-choice questions to sharpen your Electronic Engineering (MCQ) questions & answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The performance of algorithms for Adaptive Equalization are given by1. Rate of convergence2. Computational complexity3. Numerical properties4. Frequency change |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All are correct |
| Answer» C. 2 and 3 are correct | |
| 2. |
Speech Coders are categorized on the basis of |
| A. | Signal compression techniques |
| B. | Frequency of signal |
| C. | Bandwidth of the signal |
| D. | All of the above |
| Answer» B. Frequency of signal | |
| 3. |
The time span for which the equalizer converges depends upon1. Equalizer algorithm2. Equalizer structure3. Rate of change of multipath radio channel4. Amplitude of signal |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the four are correct |
| Answer» C. 2 and 3 are correct | |
| 4. |
The methods used for non linear equalization area. Decision Feedback Equalizationb. Maximum Likelihood Symbol Detectionc. Maximum Likelihood Sequence Estimation |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | None of the above |
| Answer» C. 2 and 3 are correct | |
| 5. |
The algorithms acquired for adaptive equalization are1. Zero forcing algorithm2. Least mean squares algorithm3. Recursive least squares algorithm |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | None of the above |
| Answer» C. 2 and 3 are correct | |
| 6. |
The diversity schemes are based on1. Time diversity2. Frequency diversity3. Space diversity4. Polarization diversity |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 7. |
RAKE receiver is1. Several sub receivers2. Several correlators3. Fingers4. Equalization based |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the four are correct |
| Answer» C. 2 and 3 are correct | |
| 8. |
Speech coding technique that is independent of the source is |
| A. | Vocoders |
| B. | Waveform coders |
| C. | Both a & b |
| D. | None of the above |
| Answer» C. Both a & b | |
| 9. |
Multi pulse excited LPC includes1. Multiple pulses per period2. Minimization of weighted mean square error3. Better speech quality4. Pitch detection is not required |
| A. | 1 and 4 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 4 are correct |
| D. | All four are correct |
| Answer» E. | |
| 10. |
Linear predictive coders are based on the principle that1. Current signal sample is obtained from linear combination of past samples2. Current signal sample is independent of past samples3. These are time domain vocoders4. They are among low bit rate vocoders |
| A. | 1, 3 and 4 are correct |
| B. | 2, 3 and 4 are correct |
| C. | 1 and 4 are correct |
| D. | All the four are correct |
| Answer» B. 2, 3 and 4 are correct | |
| 11. |
The speech coders are selected on the basis of1. Robustness to transmission errors2. Cell size3. Type of modulation technique used4. Distance between the transmitter and receiver |
| A. | 1 and 4 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 4 are correct |
| D. | All four are correct |
| Answer» C. 2 and 4 are correct | |
| 12. |
In FDMA,1. Each user is assigned unique frequency slots2. Demand assignment is possible3. Fixed assignment is possible4. It is vulnerable to timing problems |
| A. | 1 and 2 are correct |
| B. | 2 and 4 are correct |
| C. | 1, 2 and 3 are correct |
| D. | All four are correct |
| Answer» D. All four are correct | |
| 13. |
The advantages of FDMA over TDMA includes1. Division is simpler2. Propagation delays are eliminated3. Cheaper filters with less complicated logic functions4. Linearity |
| A. | 1, 2 and 3 are correct |
| B. | 1 and 2 are correct |
| C. | 1 and 4 are correct |
| D. | All four are correct |
| Answer» C. 1 and 4 are correct | |
| 14. |
FHMA is1. Spread spectrum technology2. Using same communication medium3. Every user has assigned unique frequency slot4. Each user has unique PN code |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 4 are correct |
| C. | 2 and 4 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 15. |
TDMA is employed with a TDMA frame that has preamble. The preamble contains Address of base station and subscribers1. Synchronization information2. Frequency allotted3. Coded sequence |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 4 are correct |
| D. | All four are correct |
| Answer» B. 1, 2 and 3 are correct | |
| 16. |
OFDM is a technique of1. Encoding digital data2. Multiple carrier frequencies3. Wide band digital communication4. 4G mobile communication |
| A. | 1, 2 and 3 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 17. |
TDMA is a multiple access technique that has |
| A. | Different users in different time slots |
| B. | Each user is assigned unique frequency slots |
| C. | Each user is assigned a unique code sequence |
| D. | Each signal is modulated with frequency modulation technique |
| Answer» B. Each user is assigned unique frequency slots | |
| 18. |
TDMA allows the user to have |
| A. | Use of same frequency channel for same time slot |
| B. | Use of same frequency channel for different time slot |
| C. | Use of same time slot for different frequency channel |
| D. | Use of different time slot for different frequency channels |
| Answer» C. Use of same time slot for different frequency channel | |
| 19. |
GSM is an example of |
| A. | TDMA cellular systems |
| B. | FDMA cellular systems |
| C. | CDMA cellular systems |
| D. | SDMA cellular systems |
| Answer» B. FDMA cellular systems | |
| 20. |
CDMA is1. Spread spectrum technology2. Using same communication medium3. Every user stays at a certain narrowband channel at a specific time period4. Each user has unique PN code |
| A. | 1, 2 and 3 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All four are correct |
| Answer» D. All four are correct | |
| 21. |
CDMA is advantageous over other Spread Spectrum techniques for1. The privacy due to unique codes2. It rejects narrow band interference3. Resistance to multi path fading4. Its ability to frequency reuse |
| A. | 1, 2 and 3 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 22. |
The wide band usage in CDMA helps in1. Increased immunity to interference2. Increased immunity to jamming3. Multiple user access4. Different spectrum allocation in different time slots |
| A. | 1, 2 and 3 are correct |
| B. | 2, 3 and 4 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» B. 2, 3 and 4 are correct | |
| 23. |
Advantages of using OFDM include1. Avoids complex equalizers2. Low symbol rate and guard interval3. Avoids ISI4. Multiple users at same frequency |
| A. | 1, 2 and 3 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 24. |
The advantages of using a CDMA technique over other spread spectrum techniques are1. Increased capacity2. Easier handoff3. Better measure of security4. Multiple users occupy different spectrum at a time |
| A. | 1, 2 and 3 are correct |
| B. | 2, 3 and 4 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» B. 2, 3 and 4 are correct | |
| 25. |
The troubles that OFDM faces over other spread spectrum techniques are1. Sensitivity to Doppler shift2. Frequency synchronization problems3. Time synchronization problems4. Low efficiency due to guard intervals |
| A. | 1, 2 and 3 are correct |
| B. | 2 and 3 are correct |
| C. | 1, 2 and 4 are correct |
| D. | All the four are correct |
| Answer» D. All the four are correct | |
| 26. |
Traffic intensity is expressed in |
| A. | Erlangs /MHz /km |
| B. | Erlangs |
| C. | / sec |
| D. | dB/sec |
| Answer» C. / sec | |
| 27. |
Diffraction, at high frequencies, depends upon1. Geometry of the object2. Polarization of the incident wave3. Amplitude of the incident wave4. Frequency of the incident wave |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All are correct |
| Answer» C. 2 and 3 are correct | |
| 28. |
Fresnel Reflection Coefficient is a factor of1. Polarization of the wave2. Properties of the material at which reflection occurs3. Angle of incidence of wave |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | All the three are correct |
| D. | 2 and 3 are correct |
| Answer» D. 2 and 3 are correct | |
| 29. |
Fading is caused due to1. Multi path propagation2. Obstacles3. Frequency variations at the source4. Variation in amplitude and phase at receiver |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 4 are correct |
| C. | 2 and 3 are correct |
| D. | All are correct |
| Answer» C. 2 and 3 are correct | |
| 30. |
Deep fade is1. Strong destructive interference2. Drop in signal to noise ratio3. Temporary failure of message transfer |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All are correct |
| Answer» E. | |
| 31. |
Friis free space equation1. Is an expression for noise power2. Is a function of transmitting and receiving antenna gain3. Depends upon the distance between transmitting and receiving antenna |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All are correct |
| Answer» D. All are correct | |
| 32. |
The free space model of propagation refers to1. Unobstructed line of sight between the transmitter and receiver2. Satellite communication systems and Microwave line of sight radio links3. Propagation along the ground surface |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» B. 1 and 3 are correct | |
| 33. |
According to Friis free space equation1. Received power falls with square of the distance between the transmitter and receiver2. Increases with square of the distance between the transmitter and receiver3. Received power increases with gains of transmitting and receiving antennas |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | All the three are correct |
| D. | 2 and 3 are correct |
| Answer» D. 2 and 3 are correct | |
| 34. |
EIRP is1. Effective Isotropic Radiated Power2. Maximum radiated power available by the transmitter3. A factor of power and gain of transmitter |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | All the three are correct |
| D. | 2 and 3 are correct |
| Answer» D. 2 and 3 are correct | |
| 35. |
Spread spectrum modulation involves1. PN sequence for modulation2. Large bandwidth3. Multiple users |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» E. | |
| 36. |
Advantage of using Spread Spectrum modulation is/are1. Interference rejection capability2. Frequency planning is not required3. Resistance to multipath fading4. ISI is lesser |
| A. | 1 and 2 are correct |
| B. | 1, 2 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the four are correct |
| Answer» E. | |
| 37. |
Slow frequency hopping refers to |
| A. | One or more symbols transmitted in time interval between frequency hops |
| B. | More than one frequency hop during each symbol |
| C. | Hopping rate greater than or equal to information symbol rate |
| D. | Both a and c are correct |
| Answer» B. More than one frequency hop during each symbol | |
| 38. |
The 2G cellular network uses |
| A. | TDMA/FDD |
| B. | CDMA/FDD |
| C. | Digital modulation formats |
| D. | All of the above |
| Answer» E. | |
| 39. |
The 2G GSM technology uses a carrier separation of |
| A. | 1.25 MHz |
| B. | 200 KHz |
| C. | 30 KHz |
| D. | 300 KHz |
| Answer» C. 30 KHz | |
| 40. |
The shape ofthe cellular region for maximum radio coverage is |
| A. | Circular |
| B. | Square |
| C. | Oval |
| D. | Hexagon |
| Answer» E. | |
| 41. |
FDMA demand assignment uses1. Single channel per carrier2. Multi channel per carrier3. Single transmission in one time slot4. Multi transmission in one time slot |
| A. | 1 and 2 are correct |
| B. | 2, 3 and 4 are correct |
| C. | 1, 2 and 3 are correct |
| D. | All four are correct |
| Answer» B. 2, 3 and 4 are correct | |
| 42. |
Advantage of using waveform coders is1. Independent of the signal source2. Less complexity3. Suitable for noisy environments |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» E. | |
| 43. |
The techniques used for small scale multipath measurements are1. Direct RF pulse system2. Spread spectrum sliding correlator channel sounding3. Frequency domain channel sounding |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» E. | |
| 44. |
Small scale multipath propagation is caused due to waves with1. Different propagation delays2. Different amplitudes3. Different phase |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» E. | |
| 45. |
The effects of small scale multipath propagation are1. Changes in signal strength2. Random frequency modulation3. Time dispersion |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 2 and 3 are correct |
| D. | All the three are correct |
| Answer» E. | |