Test: Communication Systems - 3 - Electronics and Communication Engineering (ECE) MCQ
25 Questions MCQ Test - Test: Communication Systems - 3
The output resistance of a microphone is 20 ohms. It is to feed a line of impedance 320 ohms. To ensure maximum power transfer, the turn ratio of transformer is
In a reactance FET, gm = 9 x 10-3 Siemens, gate to source resistance is one-ninth of reactance of gate to drain capacitor and frequency is 4 MHz. The capacitive-reactance is
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Audio cassettes used in household tape recorders have a width of
in (i.e., 6.3 mm) tape having two tracks of 2.5 mm width each with an in between separation of 1.3 mm.The receiver of a pulsed RADAR can detect signal power in the order of
In a 100% amplitude modulated signal, the power in the upper sideband when carrier power is to be 100 W and modulation system SSBSC, is
1
If a sound wave has a frequency of 50 Hz, the wavelength is
Skin depth at 1000 MHz in comparison with that at 500 MHz is
Consider the following
- Generation of SSB signals
- Design of minimum phase type filters
- Representation of band pass signals
The dc voltage on plate modulated class C amplifier is 8 kV. If the peak modulating voltage is 4 kV, the peak RF voltage delivered to load is
In telephone systems the relation between load r, number of calls initiated during a specified interval λ and average duration of a call (h) is
Consider the following statements about loop antenna
- It is suitable for direction finding application
- It is a single turn or multiturn coil carrying RF current
- The loop is surrounded by a magnetic field everywhere perpendicular to the loop
Which of the following is present in both TRF receiver and superheterodyne receiver?
The number of channels in a stereophonic system is
When the carrier is unmodulated, a certain transmitter radiates 9 kW when the carrier is sinusoidally modulated the transmitter radiates 10.125 kW. The modulation index will be
.A signal x(t) = 100 cos (24p x 103t) is ideally sampled with a sampling period of 50 μ sec and then passed through an ideal low pass filter with cut off frequency of 15 kHz Which of the following frequencies are present at the filter output?
12 kHz, 8 kHz.A sinusoidal voltage of 2 kV peak value is amplitude modulated to give 20% modulation. The peak value of each side band term is
.Consider the following reasons for using antenna coupler
- To prevent illegal radiation of spurious frequencies
- To tune out reactive components of antenna impedance
- To have correct value of load impedance for transmitter.
In a high speed modem the data rate handled is about
Which of the following is true in a tape recorder?
If the ratio of ac to dc load impedance of a diode detector is low, the result will be
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