WorksheetsCOMMUNICATION
Total questions: 14
Worksheet time: 5mins
What is the range of frequency for standard amplitude modulation broadcast?
A)500 TO 1500 kHz
(B)535 to 1605 kHz
(C)450 to 1600 kHz
(D)550 to 1605kHz
For telegraphy the most commonly used modulation systemis
A) FSKB
(B) two tone modulation
(C) PCM
(D) single tone modulation
The maximum power efficiency of an AM modulator is
(A) 25%
(B) 33%
(C) 50%
(D) 100%
Any device that converts one form of energy into another is called:
(A)Rectifier
(B)Amplifier
(C)Transducer
(D)None of these
The modulation index of FM is given by:
(A). μ = frequency deviation/ modulating frequency
(B). μ = modulating frequency /frequency deviation
(C). μ = modulating frequency/ carrier frequency
(D). μ = carrier frequency / modulating frequency
The range of modulating frequency for Narrow Band FM is
(A)30 Hz to 15 KHz
(B)30 Hz to 30 KHz
(C)30 Hz to 3 KHz
(D)3 KHz to 30 KHz
What is the maximum frequency deviation allowed in commercial FM broadcasting?
(A). 100 KHz
(B) 75 KHz
(C)15 KHz
(D) 120 KHz
Which of the following is the primary function of a transmitter in a communication system?
(A) To convert the message into electrical signals
(B) To encode the message
(C) To amplify the message signal
(D) To convert the message into sound waves
Which of the following modulation techniques is used in TV broadcasting?
(A) Amplitude Modulation AM
(B) Frequency Modulation (FM)
(C) Phase Modulation PM
(D) Digital Modulation
Which device is typically used to demodulate Frequency Modulation (FM) signals?
(A) Mixer
(B) Demodulator
(C) PLL (Phase-Locked Loop)
(D) Antenna
The process of converting digital data into analog signals is called:
(A) Analog-to-digital conversion
(B) Pulse code modulation
(C) Digital-to-
analog conversion
(D) Amplitude modulation
In frequency modulation (FM), the carrier signal’s frequency varies with:
(A) The amplitude of the modulating signal
(B) The phase of the modulating
signal
(C) The frequency of the modulating signal
(D) The power of the
modulating signal
The bandwidth requirement for frequency modulation is typically
determined by:
(A) The modulating signal's frequency
(B) The frequency deviation and
modulating signals frequency
(C) The modulating signal&itsamplitude
(D) The
phase shift introduced in the signal
Which of the following is the standard method for determining the
bandwidth of an FM signal?
(A) Carsons Rule
(B) Shannon’s Capacity Formula
(C) Nyquist Theorem
(D) Rayleigh Criterion
