10 Questions MCQ Test Physics Class 12 - Test: Signals & Transmission Systems
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The characteristic impedance of a coaxial wire line is of order
Detailed Solution for Test: Signals & Transmission Systems - Question 1
For a coaxial cable with air dielectric and a shield of a given inner diameter, the attenuation is minimized by choosing the diameter of the inner conductor to give a characteristic impedance of 76.7 Ω. When more common dielectrics are considered, the best-loss impedance drops down to a value between 52–64 Ω.
In which manner does current or voltage vary in an analog signal with time?
Detailed Solution for Test: Signals & Transmission Systems - Question 2
An analog signal is any continuous signal for which the time-varying feature (variable) of the signal is a representation of some other time-varying quantity, i.e., analogous to another time-varying signal. For example, in an analog audio signal, the instantaneous voltage of the signal varies continuously with the pressure of the sound waves. It differs from a digital signal, in which the continuous quantity is a representation of a sequence of discrete values which can only take on one of a finite number of values.
If an antenna radiates electromagnetic waves from a height h, then the range d upto which the signal can be detected is given by (R is the radius of the earth)
Detailed Solution for Test: Signals & Transmission Systems - Question 3
Let O be the centre and R is the radius of the earth. PQ is a T.V. antenna of height h. Two tangents QT and QS are drawn from the top Q of the tower. T.V. signal can reach to the point S and T only not at other area:
OQ=R+h, QT=d, OT=R,
d2=h2+2Rh h⋘R neglect
Super high frequencies of __________ are used in Radar and Satellite Communication.
Detailed Solution for Test: Signals & Transmission Systems - Question 4
Super high frequency (SHF) is the ITU designation for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from one to ten centimetres.
If the area of a TV telecast is to be doubled, then height of transmitting antenna will have to be
Detailed Solution for Test: Signals & Transmission Systems - Question 8
Distance of receiving antenna a from transmitting antenna is d = √(2Rh) i.e. d ∝ √h area covered ∝ d2 that is area covered ∝ h. Hence if the area is double, the height of the antenna will also be doubled.
With the increase in frequencies more than 2 MHz, Ground wave propagation
Detailed Solution for Test: Signals & Transmission Systems - Question 9
The ground wave is the preferred propagation type for long distance communication using frequencies below 3 MHz (the earth behaves as a conductor for all frequencies below 5 MHz). The ground wave is also used for short distance communications using frequencies between 3 and 30 MHz.
Test: Signals & Transmission Systems - Question 10
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