Code Division Multiple Access Question and Answers July 1, 2022 By WatElectronics This article lists 50 Code Division Multiple Access MCQs for engineering students. All the Code Division Multiple Access Questions & Answers given below include a hint and a link wherever possible to the relevant topic. This is helpful for users who are preparing for their exams, or interviews, or professionals who would like to brush up on the fundamentals of Code Division Multiple Access. CDMA stands for Code division multiple access where signals occupy a single transmission channel. In which installation cost is very high and operating cost is low where capacity holding system is very large. Where the data transmission rate is very high in which synchronization is not required because of high flexibility. Because of the spread-spectrum method, it is the most secure mode of communication. CDMA uses ADC conversion with spread spectrum technology. As the number of users increases, the amount of noise also increases through which the system will collapse. The area covered by CDMA is large compared to TDMA. CDMA is more secure and robust and it can cover a large area, but when it comes to battery life is very less. CDMA offers a transmission speed of only up to 14.4 kilobits per second in its single channel form and up to 115 Kbps in an eight-channel form. Wideband CDMA delivers data more times faster. 1). What is the full form of CDMA _____? Code division multiple access Code Dividend much access Check diode multiple access None of these None Hint 2). CDMA is used in _____ communications? Wired Wireless Satellite All of the above None Hint Read more about Wireless Communication 3). CDMA optimizes the available ____? Frequency Time Bandwidth Carrier None Hint 4). In CDMA multiplexing, multiple channels occupy a _____ transmission channel? Different Single Multiple Transparent None Hint 5). CDMA used in _____ satellite system for transportation logistics? OmniTRACS PRACS SACS None of these None Hint 6). CDMA is a ____ spectrum multiple access techniques? Narrow Spread Online Uplink None Hint 7). Data signal with pulse duration is represented by ___? Tb 1/Tb 2Tb 0.5Tb None Hint 8). Code signal with pulse duration is represented by ___? 2Tc 1/Tc Tc None of these None Hint 9). Bandwidth of the data signal is represented by _____? Tb 1/Tb 2Tb 0.5Tb None Hint 10). Bandwidth of the code signal is represented by _____? 2Tc 1/Tc Tc None of these None Hint 11). Pseudo-random code has a narrow ____ function? Angular Ambiguity Transform Direct None Hint 12) Bandwidth of the spread spectrum is much ____ than the bandwidth of the original signal? Lower Larger Smaller Lesser None Hint 13). The ratio of Tb/Tc is called a _____ factor? Unicode Spreading Tripcode None Of these None Hint 14). CDMA can effectively reject ____ band interferenc? Narrow Direct Pass Wide None Hint 15). Narrow band interference can be easily removed using ___ filter without a loss of information? Low Pass High Pass Band Pass Notch None Hint 16). CDMA uses a __ receiver to stop multipath delay components to improve the performance of the system? Direct conversion RF sampling Superheterodyne Rake None Hint 17). Spreading sequences are used in ____ CDMA? Synchronous Asynchronous Orthogonal Circular None Hint 18). Expand MAI full form _____? Merge Access Interference Multiple Access Interference Multiple arrange interpolation None of these None Hint 19). Compared with TDMA and FDMA, CDMA holds the ____ spectral efficiency? Different Same Unique None Of these None Hint 20). To recover lost data, interleaving and _____ encoding is used? Direct Involutional Convolutional Indirect None Hint 21). Asynchronous CDMA holds some ____ because the spread signal is using pseudo-random code? Not Secure Privacy Resistant None of these None Hint Code Division Multiple Access MCQs for Exams 22). ____signals are also resistant to multipath fading? FDMA CDMA TDMA WDM None Hint 23). A _____ signal only has a finite amount of power available to jam the signal? Continuous Jamming Convolution Interpolation None Hint 24). ____ is the ability to reuse the same frequency channel at other cell sites in cellular systems? Convolution Interpolation Frequency Reuse Correlation None Hint 25). CDMA provides a high _____ signal? Resistive Fading Quality Random sequence None Hint 26). An enhanced CDMA version is also called ____? TDMA FDMA WDMA IDMA None Hint 27). Processing gain formula, where W= spread rate, R=data rate then P(gain)= ______? P (gain) = 10log (W/R) P (gain) = 10log (R) P (gain) = 10log (W) None of these None Hint 28). On average, signal to noise ratio required is ____ for good quality of voice. 5dB 3dB 7dB 9dB None Hint 29).Actual processing gain is formulated as ______? P (gain) - SNR P (gain) + SNR P (gain) / SNR P (gain) * SNR None Hint 30). _____ is necessary for CDMA? Codeword Convolution Processing Transition None Hint Code Division Multiple Access Quiz Questions and Answers 31). Guard band and guard ____ are necessary for CDMA across channels? Frequency Time Wavelength Bandwidth None Hint 32). In CDMA, _____ is not required? Transition Convolution Synchronization De-synchronization None Hint 33). Mode of data transfer in CDMA is ___ signal? Analog Digital Simple Complex None Hint 34). CDMA is ___ flexible? Uniquely Simply Directly Highly None Hint 35). For random code generation, the _____ operator is used? AND OR NAND XOR None Hint 36). While compared with FDMA, the variable _____ rate is very easy? Receiving Transmitting Overflowing Stitching None Hint 37). Full ____ efficiency is required in CDMA? Transmission Reception Power None Of these None Hint 38). In CDMA, installation cost is _____? Low High Medium Constant None Hint 39). In CDMA, operating cost is very ___? Low High Medium Constant None Hint 40). In CDMA, is the capacity of the system very _____? Low Large Medium Constant None Hint Code Division Multiple Access Interview Questions and Answers 41). CDMA is highly _____ to noise? Susceptible Reduced Responsible None of these None Hint 42). CDMA carries out ___ handoff management? Hard Soft Wrong Simple None Hint 43). _____ pollution is the major issue present in the CDMA? Transfer Sound Channel Noise None Hint 44). CDMA offers a transmission speed of _____ in a single channel? 12.4Kbps 13.4Kbps 14.4Kbps 10Kbps None Hint 45). CDMA offers a transmission speed of _____ in an eight-channel form? 124Kbps 134Kbps 144Kbps 115Kbps None Hint 46).____ CDMA delivers the data many times faster? Narrowband Wideband Passband Word None Hint 47). Multipath fading is ____ due to large signal bandwidth? Improved Increased Reduced High None Hint 48). CDMA channel is nominally ___ Mhz wide. 1.24 1.23 1.21 1.45 None Hint 49). CDMA offers a maximum download speed of __ Mbps? 1 2 3 4 None Hint 50). CDMA emits very less _____? Radiation Power Voltage Capacitance None Hint Please fill in the comment box below. Time's up
