Phase Modulation Question & Answers June 7, 2022 By WatElectronics This article lists 75 Phase Modulation MCQs for engineering students. All the Phase Modulation 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, interviews, or professionals who would like to brush up on the fundamentals of Phase Modulation. Phase modulation is a type of modulation that is used for communicating signals, with the utmost transmission. PM can be used for both analog and digital data, but most of the digital transmission takes place. Phase modulation is defined where the modulating/message signal is sampled by the phase carrier of the signal. Phase deviation takes place when two signal transmission takes place at different phases. Different forms that exist in phase modulation using phase-shift keying are Binary phase-shift keying, Quadrature phase shift keying, offset phase shift keying, 8-point PSK, 16 point PSK. Change of phase is equal to frequency. Phase modulation is widely used in wireless communications like W-fi, and GSM. The data rates are observed at speed due to information transmission is done without delay. In phase modulation, the components required are complex to design. Upon the addition of the frequency multiplier, the modulation index is increased. Noise immunity is good in Phase modulation. 1). Phase modulation is a type of modulation used for the ______ of communicating signals. Reception Transmission Hybrid None of these None Hint 2). Phase modulation has ___ forms of modulation. 2 3 7 9 None Hint 3). Input signal in phase modulation changes according to ___ of a carrier wave. Amplitude Phase Frequency Time None Hint 4). h in phase modulation represents______? Modulation Index Frequency Amplitude Carrier Wave None Hint 5). Modulation index(h) formula=_______? Δf Δm Δθ Δg None Hint Read more about Modulation. 6). If height of the signals are short, then Phase modulation behaves similar to _____? Frequency Modulation Amplitude Modulation Phase Modulation None of these None Hint Read more about Amplitude Modulation. 7). For a high sine wave, Phase modulation behaves the same as _______? Frequency Modulation Amplitude Modulation Phase Modulation None of these None Hint Read more about Frequency Modulation. 8). Δθ represents _______? High peak Peak Phase Deviation Sine Wave Swing None Hint 9). Phase modulation is extensively used in transmitting _____ waves. Infrared Ultra Radio X-ray None Hint 10). Carson rule formula represented by _______? 2(h+1)fm 2fm 2hfm None Of These None Hint Phase Modulation Interview Questions and Answers 11). Message signal in phase modulation is represented by _____? w(t) m(t) p(t) q(t) None Hint 12). Phase modulation is used in technologies like ___? Wi-fi Edge Ethernet Wired None Hint 13). Phase modulation is also used in _____? Modulars Digital synthesizers Amplifiers Actuators None Hint 14). Carrier signal formula in modulation are ______? Acsin(ctc) Amsin(ct+c) Acsin(ct+c) Acsin(ct+c+1) None Hint 15). Message signal m(t) is represented by ______? cos(cthm(t)) cos(ct+hm(t)) cos(ct+hm(t)+1) cos(cthm(t)+1) None Hint 16). Phase modulation is also called ______ modulation? Di Amplitude Quadrature amplitude Double amp Hecta amplifier None Hint 17). Frequency modulation will change to phase modulation by appending ____ network to the message signal. LR CR RCL LC None Hint 18)._____ phase modulation is most widely used. Analog Digital Hybrid None of these None Hint 19). Ac in the equation is defined as carrier signal ____? Amplitude Phase Frequency Time None Hint 20). c in the equation is defined as carrier signal ______? Wavelength Amplitude Frequency Angular frequency None Hint 21). Movement of complete negative and _____ phases form a complete sine wave. Positive Negative Null None of these None Hint 22). Phase is _____ proportional to time. Indirectly Directly Hybrid Continuous None Hint 23). For phase modulation _____ be placed in the middle of AM and FM. Wavelength Noise immunity Bandwidth Frequency variations None Hint 24). Noise exemption is less in phase modulation than _____? AM PWM FM DM None Hint 25). In PM, the Signal to Noise ratio is not _____ than FM. Worst Superior Least Quality None Hint 26). _____ services are mostly used in phase modulation? Frequency Phase Mobile Radio None Of These None Hint 27). Noise immunity is ____ in PM, than that of AM. Low Least More Null None Hint 28). Even if we increase the quality of frequency deviation, the noise immunity can’t increase in ___? AM PM PWM FM None Hint Phase Modulation MCQs for Exams 29). The whole power will make use of ___ modulators? AM PM PWM FM None Hint 30). Bandwidth in PM depends on _______? Wavelength Time Modulation Index Frequency deviation None Hint 31). Bandwidth is high in ___ than AM and FM. FM PWM PM AM None Hint 32). Receivers and transmitters are ____ to design in PM? Easy Complex Trouble-Free Effortless None Hint 33). Expand PSK _______? Plant shift keying Phase shift keying Phase sine key None of these None Hint 34).Expand BPSK _____? Binary phase-shift keying Binary plane size keying Binary phase sine keying None of these None Hint 35).Expand QPSK full form_______? Quadrature phase-shift keying Quartz plane sine keying Quad phase sine keying None of these None Hint 36). Phase modulation exists with _____ speed of communication? Low High Least Null None Hint 37). Exceeds phase range up to ____ due to uncertainty in PM? 270 180 90 360 None Hint 38). Modulation index enlarges by adding _____ component. Shift Registers Frequency Multipliers Amplifiers Oscillators None Hint Phase Modulation Quiz Questions and Answers. 39).______ exists between two points of a circle in PM. Frequency deviation Phase Angle Angular Frequency Modulators None Hint 40). Units of phase sensitivity ______? rad/amp amp/volts rad/volts 1/volts None Hint 41). Phase sensitivity is represented by _____? Kp x(t) Kv x(t) Kx x(t) None of these None Hint 42). Due to sound, combination ______ takes place in PM. Phase Distortion Phase Angle Bandwidth Noise immunity None Hint 43). Phase modulation has constant _____? Frequency Phase Amplitude Angle None Hint 44). Phase modulation has ___ quality receiving signals? High Low Medium Constant None Hint 45). In PM, phase is directly proportional to ______? Amplitude Bandwidth Frequency Phase None Hint 46). In PM, amplitude and ______ maintain the same properties. Amplitude Bandwidth Frequency Phase None Hint 47). Expand OPSK full form _____? Offset phase shift keying Onboard phase shift keying On phase switch keying None of these None Hint 48). Velocity is been identified based on unattached _____? Doppler Effect Bandwidth Angular Frequency Wireless None Hint 49). In phase modulation, the ___ signals are required with phase variations in them. One Two Three Four None Hint 50).______ reaches if we increase the phase radian of modulation? Phase Angle Phase Ambiguity Phase Distortion None of these None Hint For More MCQs Modulation Questions & Answers Digital Modulation Questions & Answers Frequency Modulation Questions & Answers Amplitude Modulation Questions & Answers Please fill in the comment box below. Time's up
