Communication Systems - Online Test
Q1. Any physical quantity like temperature can be converted to
Answer : Option A
Explaination / Solution:
An electrical transducer is a device which is capable of converting the physical quantity into a proportional electrical quantity such as voltage or electric current. Hence it converts any quantity to be measured into usable electrical signal. This physical quantity which is to be measured can be pressure, level, temperature, displacement etc. The output which is obtained from the transducer is in the electrical form and is equivalent to the measured quantity. For example, a temprature transducer will convert temperature to an equivalent electrical potential. This output signal can be used to control the physical quantity or display it.moreover this is of two type Digital or Analog electrical signals.
Q2. In Analog type signals
Answer : Option B
Explaination / Solution:
A signal in which current or voltage varies with time is called analog signal.A vibrating fork produces such a sound signal of single frequency.Every speech or music is a complex signal formed by the superposition of several sinusoidal signals of different amplitudes and frequencies.
Q3. In Digital type signals, signals can take
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. Noise in electronic communication refers to
Answer : Option D
Explaination / Solution:
In communication systems, noise is an error or undesired random disturbance of a useful information signal. The noise is a summation of unwanted or disturbing energy from natural and sometimes man-made sources.Consequently,a distored or corrupted version of the transmitted signal reaches the receiver.
Q5. Transmitter is a device that
Answer : Option D
Explaination / Solution:
A transmitter is a set up that transmits the message to the receiving end through a communication channel.its main function is to modify the message signal in a form suitable for transmission over the channel and to transmit it.The transmitter is able to generate a radio frequency alternating current that is then applied to the antenna, which, in turn, radiates this as radio waves. There are many types of transmitters depending on the standard being used and the type of device; for example, many modern devices that have communication capabilities have transmitters such as Wi-Fi, Bluetooth, NFC and cellular.
Q6. FM Radio set used in cars is
Answer : Option D
Explaination / Solution:
Radio means sending energy with waves. In other words, it's a method of transmitting electrical energy from one place to another without using any kind of direct, wired connection. That's why it's often called wireless. The equipment that sends out a radio wave is known as a transmitter; the radio wave sent by a transmitter whizzes through the air—maybe from one side of the world to the other—and completes its journey when it reaches a second piece of equipment called a receiver((here a radio).
Q7. TV set used in a typical house is
Answer : Option D
Explaination / Solution:
The equipment that sends out a radio wave is known as a transmitter; the radio wave sent by a transmitter whizzes through the air—maybe from one side of the world to the other—and completes its journey when it reaches a second piece of equipment called a receiver.A television antenna, or TV aerial, is an antenna specifically designed for the reception of over-the-air broadcast television seignal, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries..
Q8. Attenuation is
Answer : Option D
Explaination / Solution:
Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes calledloss, attenuation is a natural consequence of signal transmission over long distances.
Q9. Amplification is the
Answer : Option C
Explaination / Solution:
It is the process of increasing the amplitude and hence the strength of an elctrical signal by using an electric circuit having atleat on transistor is called amplifier.Amplification is rerquired to compensate for the loss of strenght of a signal during its transmission.The additional energy is otianed from a dc source.The process of amplification is done at a location betwen the sources and the destination where the strength of signal becomes weaker than the required level.
Q10. Range of an electronic communication system
Answer : Option C
Explaination / Solution:
As the distance between the source and the destination increases the strenght of the transmitted signals become weaker and weaker and the distance where it loses energy to travel any more is range of the signal.
