Q.1.
For a plate-modulated class C amplifier the plate supply voltage is E. The maximum plate cathode voltage could be almost high as
Q.2.
In Pulse Code Modulation system
Q.3.
One of the advantages of base modulation over collector modulation of a transistor class C amplifier is
Q.4.
As per Shannon-Hartley theorem, a noise less Gaussian channel has
Q.5.
In a TV receiver antenna the length of reflector rod
Q.6.
Which of the following does not cause losses in optical fibre cables?
Q.7.
In a FM receiver, amplitude limiter
Q.8.
The direction of rotation of a CD is
Q.9.
A woofer should be fed from the input through a
Q.10.
Fourier analysis indicate that a square wave can be represented as
Q.11.
If sampling is done at the rate of 10 kHz. The bandwidth required is
Q.12.
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are
Q.13.
DVD uses
Q.14.
Leak type bias is used in plate modulated class C amplifier to
Q.15.
FM transmitting and receiving equipment as compared to AM equipment is
Q.16.
The characteristic impedance of a twin wire feeder used for TV signals is about
Q.17.
Which of the following is an indirect way of generating FM?
Q.18.
If output power of a radio receiver is doubled, its volume is increased by __________ dB.
Q.19.
For AM receivers the standard IF frequency is
Q.20.
In EM waves, polarization
Q.21.
The frequency range of 300 kHz to 3000 kHz is known as
Q.22.
In practical commercial FM system, channel bandwidth is
Q.23.
For attenuation of high frequencies we should use
Q.24.
A modem is classified as low speed if data rate handled is
Q.25.
Circular polarization
Q.26.
PAM stands for
Q.27.
VSB modulation is preferred in TV because
Q.28.
For attenuation of high frequencies we should use
Q.29.
A woofer should be fed from the input through a
Q.30.
DVD uses