Comprehensive
Binary Phase Shift Keying and Communication Systems Quiz
Test your knowledge of binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), and other advanced communication systems with this comprehensive quiz. Dive deep into topics including modulation schemes, signal processing, and error rate optimization.
Whether you're a student, a professional in telecommunications, or just someone interested in the science of communication, this quiz will challenge your understanding and help reinforce your learning!
- 55 questions covering essential communication concepts
- Multiple-choice format with instant feedback
- Perfect for students and professionals alike
In Binary Phase Shift Keying system, the binary symbols 1 and 0 are represented by carrier with phase shift of
A) π/2
B) π
C) 2π
D) 0
BPSK system modulates at the rate of
A) 1 bit/ symbol
B) 2 bit/ symbol
C) 4 bit/ symbol
D) None of the above
The binary waveform used to generate BPSK signal is encoded in
A) Bipolar NRZ format
B) Manchester coding
C) Differential coding
D) None of the above
QPSK is a modulation scheme where each symbol consists of
A) 4 bits
B) 2 bits
C) 1 bit
D) M number of bits, depending upon the requirement
A nyquist pulse is the one which can be represented by _____ shaped pulse multiplied by another time function.
A) Sine
B) Cosine
C) Sinc
D) None of the mentioned
In coherent detection of signals,
A) Local carrier is generated
B) Carrier of frequency and phase as same as transmitted carrier is generated
C) The carrier is in synchronization with modulated carrier
D) All of the above
The minimum nyquist bandwidth for the rectangular spectrum in raised cosine filter is
A) 2T
B) 1/2T
C) T2
D) 2/T
Roll off factor is the fraction of
A) Excess bandwidth and absolute bandwidth
B) Excess bandwidth and minimum nyquist bandwidth
C) Absolute bandwidth and minimum nyquist bandwidth
D) None of the mentioned
Equalization process includes
A) Maximum likelihood sequence estimation
B) Equalization with filters
C) Maximum likelihood sequence estimation & Equalization with filters
D) None of the mentioned
The filters used with the equalizer is of ______ types.
A) Feed forward
B) Feed backward
C) Feed forward and feedback
D) None of the mentioned
The detector that minimizes the error probability is called as
A) Maximum likelihood detector
B) Minimum likelihood detector
C) Maximum & Minimum likelihood detector
D) None of the mentioned
An error in binary decision making occurs when the channel noise is
A) Greater than the optimum threshold level
B) Lesser than the optimum threshold level
C) Greater or Lesser than the optimum threshold level
D) None of the mentioned
Entropy is
A) Average information per message
B) Information in a signal
C) Amplitude of signa
D) All of the above
The relation between entropy and mutual information is
A) I(X;Y) = H(X) - H(X/Y)
B) I(X;Y) = H(X/Y) - H(Y/X)
C) I(X;Y) = H(X) - H(Y)
D) I(X;Y) = H(Y) - H(X)
Code rate r, for k information bits and n as total bits, is defined as
A)r= k/n
B) k=n/r
C) r=k*n
D) n=r*k
For M equally likely messages, M>>1, if the rate of information R > C, the probability of error is
A) Arbitrarily small
B) Close to unity
C) Not predictable
D) Unknown
For M equally likely messages, the average amount of information H is
A) H= log10M
B) H= log2M
C) H= log10M2
D) H= 2log10M
The capacity of Gaussian channel is
A) C= 2B(1+S/N) bits/s
B) C= B2(1+S/N) bits/s
C) C= B(1+S/N) bits/s
D) C= B(1+S/N)2 bits/s
Orthogonality of two codes means
A) The integrated product of two different code words is zero
B) The integrated product of two different code words is one
C) The integrated product of two same code words is zero
D) None of the above
Equalization method which is done by tracking a slowly time varying channel response is
A) Preset equalization
B) Adaptive equalization
C) Variable equalization
D) None of the mentioned
The correlating detector is also known as
A) Maximum likelihood detector
B) Minimum likelihood detector
C) Maximum & Minimum likelihood detector
D) None of the mentioned
The limit which represents the threshold Eb/N0 value below which reliable communication cannot be maintained is called as
A) Probability limit
B) Error limit
C) Shannon limit
D) Communication limit
A bit stream would be portioned into an even stream and an odd stream in which of these systems?
A. FSK
B. QPSK
C. MSK
D. BPSK
Which A/D converter is considered to be simplest, fastest and most expensive?
A) Servo converter
B) Counter type ADC
C) Flash type ADC
D) All of the mentioned
An Astable Multivibrtor is also known as
A) One Shot Multivibrator
B) Free-Running Multivibrator
C) Bistable Multivibrator
D) None of the above
How a triangular wave generator is derived from square wave generator?
A) Connect oscillator at the output
B) Connect Voltage follower at the output
C) Connect differential at the output
D) Connect integrator at the output
Which circuit converts irregularly shaped waveform to regular shaped waveforms
A) Schmitt trigger
B) Voltage limiter
C) Comparator
D) None of the mentioned
Narrow band-pass filters are defined as
A) Q < 10
B) Q=10
C) Q>10
D) None of the mentioned
The purpose of level shifter in Op-amp internal circuit is to
A) Adjust DC voltage
B) Increase impedance
C) Provide high gain
D) Decrease input resistance
______________is the process of setting a transistors DC operating voltage or current conditions to the correct level.
A) Regulation
B) Biasing
C) Stabilisation
D) Shifting
An op-amp is a direct coupled high gain amplifier
A) TRUE
B) FALSE
OPAMP can operate on
A) AC
B) DC
C) BOTH
D) NONE
The voltage present at the output of an op-amp when its differential input voltage is zero is called as?
A) Open loop voltage gain
B) Common Mode Rejection Ratio
C) Output offset voltage
D) Closed offset voltage
CMRR can be represented as?
A) the addition of the closed loop differential gain and the common mode gain
B) the multiplication of the closed loop differential gain and the common mode gain
C) the subtraction of the closed loop differential gain and the common mode gain
D) the ratio of the closed loop differential gain and the common mode gain
Ideal Opamp has the following characteristics
A) Rin=infinity, A=inifinity, Ro=infinity
B) Rin=0, A=inifinity, Ro=0
C) Rin=infinity, A=inifinity, Ro=0
D) Rin=0, A=inifinity, Ro=infinity
What is the output
A) Sinusoidal signal
B) Square Signal
C) DC signal
D) Sawtooth Signal
Voltage Follower
A) it has hign input impedance and low output impedance
B) Its a non inverting amplifier with negative feedback
C) Its voltage gain is unity
D) All of the above
What is the output voltage for an input voltage of -1V
A) -11V
B) 11V
C) 10V
D) -10V
Calculate the output voltage if R1=R2=R3=50Ω , Rf=1k Ω and V1=V2=V3=50mV [
A) -3V
B) -1V
C) 3V
D) 1V
Decreasing the gain can be achieved by
A) Reducing the amplitude of input voltage
B) Increasing the value of Rf
C) Increasing the value of Ri
D) Removing Rf
A certain pulse measures 10ms and has a period of 50ms. Duty cycle is
A) 5%
B) 10%
C) 20%
D) 50%
For the given circuit R1=2.1KΩ and R2=6.3KΩ. Find the output voltage in terms of Va and Vb
A) 0.33(Va-Vb)
B) 4.2(Va-Vb)
C) 3(Va-Vb)
D) -4.2(Va-Vb)
Output Voltage Vo of the circuit given below: Input voltages are V1=2.5V and V2=1V
A) +4
B) +4.5
C) -4.5
D) -4
Hexadecimal and BCD numbers of decimal number 43 are
A) B2, 0100 0110
B) 2B, 0100 0011
C) 2B, 0011 0100
D) B2, 0100 0100
How many 3-line-to-8-line decoders are required for a 1-of-32 decoder?
A) 1
B) 2
C) 4
D) 8
How many fl ip-fl ops are required to produce a divide-by-128 device?
A) 1
B) 4
C) 6
D) 7
What is the modulus of 3-bit Johnson’s counter
A) 3
B) 8
C) 6
D) None of above
The 1’s complement of (+5) 10 is
A) 0101
B) 1010
C) 1011
D) 1101
The Canonical form of Y=AB’C+A’BC+AB is Y(A,B,C)=
A) Σm (1,3,5,6,7)
B) Σm (0,5,6,7)
C) Σm (3,5,7)
D) Σm (3,5,6,7)
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