Analog Communication MCQs | Analog Communication Multiple Choice Questions and Answers

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

Questions
1 How we limit the response of a receiver to a weak signal?
A by the AGC
B by the noise that is generated in the receiver
C by the dynamic range of the receiver
D by the type of detector circuit being used

Answer: by the noise that is generated in the receiver
2 Which statement is true for high level amplitude modulation?
A all RF amplifiers can be nonlinear
B all RF amplifiers are of class A
C minimum RF power is required
D maximum RF power is required

Answer: all RF amplifiers can be nonlinear
Advertisement
Article and Schedule Quiz Start Test!
DOWNLOAD CURRENT AFFAIRS PDF FROM APP
3 Which two networks can be used for impedance matching?
A pi network and T network
B bridge network and T network
C pi network and omega network
D pi network and bridge network

Answer: pi network and T network
4 Which statement is true about frequency multipliers?
A they are essentially class C amplifiers
B they are essentially balanced modulators
C they are essentially class AB amplifiers
D they are essentially mixers

Answer: they are essentially class C amplifiers
5 Drawback of using PAM method is
A Bandwidth is very large as compared to modulating signal
B Due to varying amplitude of carrier, it is difficult to remove noise at receiver
C Varying amplitude of carrier varies the peak power required for transmission
D All of the above

Answer: All of the above
6 In Pulse time modulation (PTM),
A Position or width of the carrier varies with modulating signal
B Pulse width modulation and pulse position modulation are the types of PTM
C Amplitude of the carrier is constant
D All of the above

Answer: All of the above
7 In Pulse Position Modulation, the drawbacks are
A Synchronization is required between transmitter and receiver
B Large bandwidth is required as compared to PAM
C None of the above
D Marketing

Answer: Both a and b
8 In pulse width modulation,
A Instantaneous power at the transmitter is constant
B Amplitude of the carrier pulse is varied
C Synchronization is not required between transmitter and receiver
D None of the above

Answer: Synchronization is not required between transmitter and receiver
9 In PWM signal reception, the Schmitt trigger circuit is used
A To produce ramp signal
B For synchronization
C To remove noise
D None of the above

Answer: To remove noise
10 What we use for impedance matching in RF amplifiers?
A RC coupling
B Transformer coupling
C Direct coupling
D RF coupling

Answer: Transformer coupling
11 In a receiver, distortion can occur in ________
A Mixer
B Detector
C IF amplifiers
D Either mixer or detector or IF amplifiers

Answer: Either mixer or detector or IF amplifiers
12 When aliasing will take place?
A Sampling signals more than Nyquist Rate
B Sampling signals equal to Nyquist Rate
C Sampling signals at a rate which is twice of Nyquist Rate
D Sampling signals less than Nyquist Rate

Answer: Sampling signals less than Nyquist Rate
13 Which statement is true for low level amplitude modulation?
A all RF amplifiers can be linear
B all RF amplifiers are of class A
C minimum RF power is required
D maximum RF power is required

Answer: all RF amplifiers can be linear
14 Notch filter is a
A Band pass filter
B Low pass filter
C High pass filter
D Band stop filter

Answer: Band stop filter
15 Noise power at the resistor is affected by the value of the resistor as
A Unaffected by the value of the resistor
B Directly proportional to the value of the resistor
C Inversely proportional to the value of the resistor
D Becomes half as the resistance value is doubled

Answer: Unaffected by the value of the resistor
16 At a room temperature of 300K, calculate the thermal noise generated by two resistors of 10KΩ and 30 KΩ when the bandwidth is 10 KHz and the resistors are connected in parallel.
A 30.15 * 10-3
B 11.15 * 10-7
C 8.23 * 10-23
D 26.85 * 10-7

Answer: 11.15 * 10-7
17 A periodic signal is
A May be represented by g(t) = g(t + T0)
B Value may be determined at any point
C Repeats itself at regular intervals
D All of the above

Answer: All of the above
18 Properties of Hilbert transform are:
A The signal and its Hilbert transform have same energy density spectrum
B The signal and its Hilbert transform are mutually diagonal
C Both a and b are correct
D None of the above

Answer: Both a and b are correct
19 Random signals is
A May be specified in time
B Repeat over a period
C Occurrence is random
D None of the above

Answer: Occurrence is random
20 The rms value of thermal noise voltage is related to Boltzmann’s constant k as
A Vn is Directly proportional to √k
B Vn is Directly proportional to k2
C Vn is Directly proportional to k
D Vn is Directly proportional to k3

Answer: Vn is Directly proportional to √k

Random GK Questions

Q. Who became the first cricketer to score four successive one day international centuries during world cup 2015?
Q. The system of proportional representation as an electoral mechanism ensures
Q. The non-permanent members of the Security Council are elected for
Q. Candle is a mixture of
Q. In India, the right to property is now recognized as
Q. The largest volume of food grains to be given per family as determined under Annapurna Scheme is
Assam Direct Recruitment Test Series

Teacher Eligibility Test

Assam Direct Recruitment Test Series