1. Communication is the process of:
(A) Transmitting information from one place to another
(B) Generating electric power
(C) Storing digital data
(D) Amplifying mechanical motion
2. The main components of a communication system are:
(A) Transmitter, Channel, and Receiver
(B) Antenna, Modulator, and Demodulator only
(C) Source, Filter, and Load
(D) Power supply, Transistor, and Diode
3. The function of a transmitter is to:
(A) Convert information into a suitable signal for transmission
(B) Amplify received signals
(C) Filter noise from signals
(D) Store data for future use
4. The receiver in a communication system:
(A) Extracts information from the received signal
(B) Transmits signals
(C) Generates carrier signals
(D) Amplifies outgoing data
5. The medium that carries the signal from transmitter to receiver is called:
(A) Channel
(B) Filter
(C) Amplifier
(D) Switch
6. Noise in communication systems refers to:
(A) Unwanted signals that interfere with information
(B) Amplified data signals
(C) Electrical energy storage
(D) Frequency modulation
7. Modulation is used in communication systems to:
(A) Transmit signals over long distances
(B) Eliminate all noise
(C) Store data
(D) Reduce antenna size
8. The three basic types of modulation are:
(A) Amplitude, Frequency, and Phase modulation
(B) Digital, Analog, and Hybrid modulation
(C) Linear, Nonlinear, and Constant modulation
(D) Coherent, Noncoherent, and Random modulation
9. AM stands for:
(A) Amplitude Modulation
(B) Analog Multiplication
(C) Amplifier Mode
(D) Amplitude Measurement
10. FM stands for:
(A) Frequency Modulation
(B) Filter Modulation
(C) Frequency Management
(D) Fast Multiplexing
11. PM stands for:
(A) Phase Modulation
(B) Pulse Modulation
(C) Power Modulation
(D) Phase Multiplication
12. In AM, the amplitude of the carrier signal:
(A) Varies according to the message signal
(B) Remains constant
(C) Depends on frequency
(D) Increases exponentially
13. In FM, the frequency of the carrier signal:
(A) Varies according to the message signal
(B) Remains constant
(C) Depends on amplitude
(D) Becomes zero at high modulation
14. In PM, the phase of the carrier signal:
(A) Varies according to the message signal
(B) Remains constant
(C) Depends on amplitude
(D) Shifts linearly with frequency
15. The purpose of demodulation is to:
(A) Recover the original information signal
(B) Generate carrier waves
(C) Increase transmission range
(D) Store transmitted data
16. The process of combining multiple signals into one channel is called:
(A) Multiplexing
(B) Modulation
(C) Filtering
(D) Sampling
17. The reverse process of multiplexing is:
(A) Demultiplexing
(B) Modulation
(C) Transmission
(D) Sampling
18. In digital communication, data is transmitted as:
(A) Discrete binary symbols
(B) Continuous waves
(C) Mechanical signals
(D) Analog pulses
19. The main advantage of digital communication over analog is:
(A) Better noise immunity
(B) Lower bandwidth usage
(C) Higher distortion
(D) More power consumption
20. The modulation technique used in digital communication is called:
(A) Digital Modulation
(B) Analog Modulation
(C) Frequency Division
(D) Pulse Amplification
21. PCM stands for:
(A) Pulse Code Modulation
(B) Phase Carrier Modulation
(C) Power Control Method
(D) Pulse Carrier Measurement
22. The main stages of PCM are:
(A) Sampling, Quantization, and Encoding
(B) Modulation, Filtering, and Transmission
(C) Detection, Storage, and Amplification
(D) Coding, Decoding, and Multiplexing
23. In FM broadcasting, the standard frequency band used is:
(A) Very High Frequency (VHF)
(B) Medium Frequency (MF)
(C) Ultra Low Frequency (ULF)
(D) Super High Frequency (SHF)
24. AM radio broadcasting typically uses:
(A) Medium Frequency band
(B) High Frequency band
(C) Ultra High Frequency band
(D) Microwave Frequency band
25. The main function of an antenna is to:
(A) Radiate and receive electromagnetic waves
(B) Store electrical energy
(C) Amplify signals
(D) Convert sound to voltage
26. Bandwidth in communication systems refers to:
(A) Range of frequencies transmitted
(B) Power level of the signal
(C) Phase shift of the carrier
(D) Delay time of transmission
27. The efficiency of a communication system is often measured by:
(A) Signal-to-Noise Ratio (SNR)
(B) Modulation Index
(C) Transmission Voltage
(D) Carrier Power
28. Satellite communication uses which type of wave propagation?
(A) Space wave
(B) Sky wave
(C) Ground wave
(D) Surface wave
29. Fiber optic communication is based on:
(A) Total internal reflection
(B) Electromagnetic induction
(C) Frequency modulation
(D) Magnetic coupling
30. The main purpose of error control in communication is to:
(A) Detect and correct transmission errors
(B) Increase transmission power
(C) Reduce data rate
(D) Minimize carrier frequency