A loudspeaker converts:
1.electrical signals into sound signals
2. sound signals into electrical signals
3.both (a) and (b)
4.neither (a) nor (b)
Posted Date:-2021-12-17 05:11:39
A microphone converts:
1.sound signals into electrical signals
2.electrical signals into sound signals
3.both (a) and (b)
4.Neither (a) nor (b)
Posted Date:-2021-12-17 05:10:30
AM is used for broadcasting because:
1.it is more noise immune than other modulation system
2. it requires less transmitting power compare with other systems
3.its use avoids receiver complexity
4.No other modulation system can provide the necessary bandwidth faithful transmission
Posted Date:-2021-12-17 05:22:27
An antenna is:
1.Inductive
2.Capacitive
3.Resistive
4. A transformer
Posted Date:-2021-12-17 05:06:13
Broadcasting antenna are generally:
1.Ommi directional type
2.Vertical type
3.Horizontal type
4.None
Posted Date:-2021-12-17 05:07:14
Communication channel consists of:
1. transmission line only
2.optical fibre only
3.free space only
4.All the above
Posted Date:-2021-12-17 05:21:25
Digital signals:
1.represents values as discrete steps
2.Do not represents values as discrete steps
3.represent values steps
4.represent random steps
Posted Date:-2021-12-17 05:23:31
In space communication, the sound waves can be sent from one place to another:
1.through space
2.through wires
3.by superimposing it on undamped electro-magnetic waves
4.by superimposing it on damped electro-magnetic waves
Posted Date:-2021-12-17 05:15:53
Increase in frequency deviation results into:
1.increase in noise of FM receiver
2.decrease in noise of AM receiver
3.increase in noise of Am receiver
4.decrease in noise of FM receiver
Posted Date:-2021-12-17 05:25:09
Name the man who was first to place his foot on the moon and in which year:
1. Neil Armstrong, 1969
2.James Van A lien, 1971
3.Leonov, 1965
4.None of the these
Posted Date:-2021-12-17 05:09:35
The audio frequencies range from:
1.20 Hz to 20.000 kHz
2.20 Hz to 20 kHz
3. 20 kHz to 20.000 kHz
4.None of the these
Posted Date:-2021-12-17 05:02:51
The length of a half wave dipole at 30 mega-hertz is:
1.5 m
2.10 m
3.25 m
4.80 m
Posted Date:-2021-12-17 05:14:57
The modulation index in amplitude modulation is:
1.Always zero
2.Between 0 and 1
3.Between 1 and ∞
4. None of these
Posted Date:-2021-12-17 05:08:02
The output of a digital computer is an example of:
1.digital signal
2.analog signal
3.both (a) and (b)
4.neither (a) nor (b)
Posted Date:-2021-12-17 05:08:49
The space waves which are affected seriously by atmospheric conditions are:
1.MF
2.HUF
3.VHF
4.UHF
Posted Date:-2021-12-17 05:05:16
The term used “to collect the information about an object and a place without physical contact” is called :
1.modulation
2.communication
3.amplification
4.remote sensing
Posted Date:-2021-12-17 05:01:58
The wavelength of a wave of frequency 10 kHz is:
1.30 m
2.300 m
3.30 km
4.300 km
Posted Date:-2021-12-17 05:03:40
Which is more advantageous?
1. analog data communication
2.digital data communication
3. both (a) and (b) are equally good
4.depends on the situation
Posted Date:-2021-12-17 05:17:41
Which of the following is not transducer?
1.Loudspeaker
2.Amplifier
3.Microphone
4.All
Posted Date:-2021-12-17 05:04:38
Who undertook the first space walk and in which year?
1.Leonov 1965
2.Neil Armstrong, 1969
3.Rakesh Sharma. 1998
4.None of the above these
Posted Date:-2021-12-17 05:01:17