Q#1: Analog transmission refers to:
(A) Sending digital data over digital signals
(B) Sending analog data over analog signals
(C) Sending data without encoding
(D) None of the above
Answer: (B) Sending analog data over analog signals
Q#2: Analog signals are:
(A) Discrete
(B) Continuous
(C) Binary
(D) None of the above
Answer: (B) Continuous
Q#3: Amplitude of a signal represents:
(A) Signal power or height
(B) Frequency
(C) Phase
(D) Bit rate
Answer: (A) Signal power or height
Q#4: Frequency of a signal represents:
(A) Signal amplitude
(B) Number of cycles per second
(C) Phase
(D) Bit duration
Answer: (B) Number of cycles per second
Q#5: Phase of a signal represents:
(A) Wave height
(B) Timing position in the cycle
(C) Frequency
(D) Bit duration
Answer: (B) Timing position in the cycle
Q#6: Sine wave is:
(A) Periodic analog signal
(B) Digital signal
(C) Aperiodic signal
(D) None
Answer: (A) Periodic analog signal
Q#7: Amplitude modulation (AM) varies:
(A) Signal amplitude
(B) Frequency
(C) Phase
(D) Bit rate
Answer: (A) Signal amplitude
Q#8: Frequency modulation (FM) varies:
(A) Signal amplitude
(B) Frequency
(C) Phase
(D) Time
Answer: (B) Frequency
Q#9: Phase modulation (PM) varies:
(A) Phase of carrier
(B) Frequency
(C) Amplitude
(D) Time
Answer: (A) Phase of carrier
Q#10: Analog signals can be converted to digital using:
(A) Sampling, quantization, and encoding
(B) Modulation only
(C) Frequency shift
(D) Phase shift
Answer: (A) Sampling, quantization, and encoding
Q#11: Sampling is:
(A) Measuring analog signal at regular intervals
(B) Modulating signal
(C) Demodulating signal
(D) Error detection
Answer: (A) Measuring analog signal at regular intervals
Q#12: Quantization is:
(A) Mapping analog samples to discrete levels
(B) Error detection
(C) Multiplexing
(D) Modulation
Answer: (A) Mapping analog samples to discrete levels
Q#13: Pulse Code Modulation (PCM) uses:
(A) Sampling, quantization, and encoding
(B) Amplitude modulation
(C) Frequency modulation
(D) Phase modulation
Answer: (A) Sampling, quantization, and encoding
Q#14: Bandwidth refers to:
(A) Maximum data rate that can be transmitted
(B) Signal amplitude
(C) Phase
(D) Bit rate
Answer: (A) Maximum data rate that can be transmitted
Q#15: Analog transmission is affected by:
(A) Noise
(B) Attenuation
(C) Distortion
(D) All of the above
Answer: (D) All of the above
Q#16: Noise in analog transmission causes:
(A) Unwanted signals
(B) Reduced amplitude
(C) Frequency shift
(D) Phase shift
Answer: (A) Unwanted signals
Q#17: Attenuation is:
(A) Loss of signal strength
(B) Signal amplification
(C) Phase shift
(D) Frequency change
Answer: (A) Loss of signal strength
Q#18: Distortion refers to:
(A) Alteration of waveform during transmission
(B) Amplification
(C) Multiplexing
(D) Sampling
Answer: (A) Alteration of waveform during transmission
Q#19: Signal-to-Noise Ratio (SNR) measures:
(A) Ratio of signal power to noise power
(B) Bandwidth
(C) Frequency
(D) Bit rate
Answer: (A) Ratio of signal power to noise power
Q#20: Higher SNR means:
(A) Better signal quality
(B) Poorer signal quality
(C) Less bandwidth
(D) More attenuation
Answer: (A) Better signal quality
Q#21: Modulation is used to:
(A) Shift baseband signal to higher frequency
(B) Convert digital to analog
(C) Convert analog to digital
(D) Error detection
Answer: (A) Shift baseband signal to higher frequency
Q#22: Amplitude Shift Keying (ASK) is:
(A) Digital modulation using amplitude
(B) Analog modulation using amplitude
(C) Frequency modulation
(D) Phase modulation
Answer: (A) Digital modulation using amplitude
Q#23: Frequency Shift Keying (FSK) is:
(A) Digital modulation using frequency
(B) Analog modulation
(C) Phase modulation
(D) Amplitude modulation
Answer: (A) Digital modulation using frequency
Q#24: Phase Shift Keying (PSK) is:
(A) Digital modulation using phase
(B) Analog modulation
(C) Frequency modulation
(D) Amplitude modulation
Answer: (A) Digital modulation using phase
Q#25: Carrier wave is:
(A) High-frequency signal modulated by data
(B) Original data
(C) Noise
(D) Attenuation
Answer: (A) High-frequency signal modulated by data
Q#26: Baseband transmission sends:
(A) Digital or analog signals without modulation
(B) Only digital signals
(C) Only analog signals
(D) Frequency modulated signals
Answer: (A) Digital or analog signals without modulation
Q#27: Broadband transmission uses:
(A) Modulation to higher frequency
(B) Digital signals only
(C) Direct baseband transmission
(D) None
Answer: (A) Modulation to higher frequency
Q#28: Analog-to-digital conversion allows:
(A) Digital systems to process analog signals
(B) Analog transmission
(C) Frequency modulation
(D) Amplitude modulation
Answer: (A) Digital systems to process analog signals
Q#29: Nyquist theorem states:
(A) Sampling rate ≥ 2 × maximum frequency
(B) Sampling rate = maximum frequency
(C) Bit rate = bandwidth
(D) None
Answer: (A) Sampling rate ≥ 2 × maximum frequency
Q#30: Quantization error occurs due to:
(A) Approximating analog samples to nearest levels
(B) Noise
(C) Attenuation
(D) Multiplexing
Answer: (A) Approximating analog samples to nearest levels
Q#31: Demodulation is:
(A) Extracting original signal from modulated carrier
(B) Modulation
(C) Sampling
(D) Multiplexing
Answer: (A) Extracting original signal from modulated carrier
Q#32: Analog amplitude modulation (AM) has:
(A) Carrier amplitude varies with data
(B) Carrier frequency varies with data
(C) Carrier phase varies with data
(D) Carrier bandwidth remains constant
Answer: (A) Carrier amplitude varies with data
Q#33: Frequency modulation (FM) has:
(A) Carrier frequency varies with data
(B) Carrier amplitude varies with data
(C) Carrier phase varies with data
(D) Carrier bandwidth remains constant
Answer: (A) Carrier frequency varies with data
Q#34: Phase modulation (PM) varies:
(A) Carrier phase
(B) Carrier frequency
(C) Carrier amplitude
(D) Bit rate
Answer: (A) Carrier phase
Q#35: Analog transmission advantage:
(A) Simple circuits
(B) Low bandwidth
(C) Less susceptible to noise than digital
(D) Complex processing
Answer: (A) Simple circuits
Q#36: Analog transmission disadvantage:
(A) Susceptible to noise
(B) Easy error detection
(C) Can regenerate easily
(D) Less distortion
Answer: (A) Susceptible to noise
Q#37: Twisted pair, coaxial cable, and fiber optics can carry:
(A) Analog signals
(B) Digital signals
(C) Both analog and digital
(D) None
Answer: (C) Both analog and digital
Q#38: SNR improvement can be achieved by:
(A) Amplifiers
(B) Repeaters
(C) Filtering
(D) All of the above
Answer: (D) All of the above
Q#39: Analog transmission is widely used in:
(A) Voice telephony
(B) Digital networking only
(C) Ethernet
(D) Internet only
Answer: (A) Voice telephony
Q#40: Modem converts:
(A) Digital to analog and vice versa
(B) Analog to analog
(C) Digital to digital
(D) None
Answer: (A) Digital to analog and vice versa
Q#41: Attenuation in analog signals increases with:
(A) Distance
(B) Frequency
(C) Both A and B
(D) None
Answer: (C) Both A and B
Q#42: Analog signal distortion can be caused by:
(A) Nonlinearities in medium
(B) Noise
(C) Both A and B
(D) None
Answer: (C) Both A and B
Q#43: Sine wave carrier is used for:
(A) Modulation
(B) Multiplexing
(C) Error detection
(D) Digital line coding
Answer: (A) Modulation
Q#44: Amplitude modulation bandwidth depends on:
(A) Data signal bandwidth
(B) Carrier frequency
(C) Carrier amplitude
(D) Noise
Answer: (A) Data signal bandwidth
Q#45: FM bandwidth is:
(A) Greater than AM
(B) Less than AM
(C) Equal to AM
(D) None
Answer: (A) Greater than AM
Q#46: Phase modulation bandwidth is:
(A) Comparable to FM
(B) Less than FM
(C) Equal to AM
(D) None
Answer: (A) Comparable to FM
Q#47: Noise in analog transmission leads to:
(A) Signal degradation
(B) Increased SNR
(C) Reduced distortion
(D) None
Answer: (A) Signal degradation
Q#48: Analog signal regeneration is:
(A) Amplification only
(B) Complete restoration
(C) Sampling
(D) Modulation
Answer: (A) Amplification only
Q#49: Digital transmission is preferred over analog due to:
(A) Less noise effect
(B) Easier regeneration
(C) Better error detection
(D) All of the above
Answer: (D) All of the above
Q#50: Frequency division multiplexing (FDM) is used for:
(A) Analog signals over broadband
(B) Baseband digital
(C) Error detection
(D) Phase encoding
Answer: (A) Analog signals over broadband