Department of Electrical Engineering and Technology
Government College University, Faisalabad
Final LAB Examination 2021-22
Program
: BSc Electrical Engineering Technology
Semester
: 5th
Course Title: Communication Technology
Max Marks : 12
Course Code : EET-503
Duration
: 30 Min
Instructor
: Zahid Iqbal
Q1: The frequency range of 300 KHz to 30000 KHz is known as
(a) low frequency
(b) high frequency
(c) medium frequency
(d) very high frequency
Q2: Which of the following is a digital modulation technique?
(a) PCM
(b) PSK
(c) DM
(d) All
Q3: Which of the following are two most important classes of angle modulation?
(a) Amplitude modulation, frequency modulation
(b) Amplitude modulation, phase modulation
(c) Frequency modulation, phase modulation
(d) Single sideband amplitude modulation, phase modulation
Q4: A signal can be recovered from its sample by using.
(a) low pass filter
(b) high pass filter
(c) band pass filter
(d) band stop filter
Q5: In amplitude modulation frequency and phase of carrier ________.
(a) Varies simultaneously
(b) Varies alternately
(c) Initially varies but become same after sometime
(d) Remains constant
Q6: Fourier analysis indicate that a square wave can be represented as
(a) a fundamental sine wave and odd harmonics
(b) a fundamental sine wave and even harmonics
(c) a fundamental sine wave and harmonics
(d) fundamental and subharmonic sine wave
Q7: Which of the following stage is present in FM receiver but not in AM receiver?
(a) Amplitude limiter
(b) Demodulator
(c) AM amplifier
(d) Mixer
Q8: The reduction of continuous signal to a discrete time representation of the original signal.
(a) Quantization
(b) Encoding
(c) Sampling
(d) None
Q9: Which command is used to clear a command window?
(a) clear
(b) close all
(c) clear all
(d) clc
Q10: Which of the following is not a pre-defined variable in MATLAB?
(a) pi
(b) inf
(c) i,j
(d) gravity
Q11: Single side band Modulation (SSB) is generally reserved for point to point
communication.
(a) True
(b) False
Q12: What is output of A= [1 0 2]; B= [3 0 7]; c=a.*b;
(a) [14 0 3]
(b) [7 0 3]
(c) [3 0 14]
(d) [2 0 21]