Telecommunication Switching Systems And Network! Trivia Quiz

2.

For two-stage network, the switching elements for M inlets with r blocks and N outlets with s blocks are given by

Ms + Nr
Mr + Ns
(M + N) (r + s)
(M + N)rs

Correct Answer

A. Ms + Nr

Explanation

The given expression, Ms + Nr, represents the number of switching elements required for a two-stage network with M inlets and N outlets. In the first stage, there are M inlets and r blocks, so the number of switching elements required is Mr. In the second stage, there are N outlets and s blocks, so the number of switching elements required is Ns. Therefore, the total number of switching elements required for the two-stage network is Ms + Nr.

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3.

As per Nyquist criterion, the sampling rate is: Where fs is the signal frequency

2fs
(1/2)fs
(1/2fs)
(2/fs)

Correct Answer

A. 2fs

Explanation

As per Nyquist criterion, the sampling rate should be at least twice the signal frequency (2fs) in order to accurately reconstruct the original signal. This is because the Nyquist-Shannon sampling theorem states that in order to avoid aliasing and loss of information, the sampling rate must be greater than or equal to twice the highest frequency component of the signal being sampled. Therefore, the correct answer is 2fs.

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4.

To receive satellite signal feed is kept at ________________ of PDA.

Correct Answer
Focal Point

Explanation
The correct answer is "Focal Point." The focal point is the specific point where all the parallel rays of light converge after passing through a lens or reflecting off a mirror. In the context of receiving a satellite signal feed, the focal point refers to the point where the feed is focused and concentrated to ensure optimal reception. By keeping the feed at the focal point of a PDA (Personal Digital Assistant), the device can effectively capture and process the satellite signal.

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5.

Peak to peak value of an a.c. voltage can be measured with the help of ____________________

Correct Answer
CRO

Explanation
The peak to peak value of an AC voltage can be measured with the help of a CRO, which stands for Cathode Ray Oscilloscope. A CRO is a device used to display and analyze electrical waveforms. It works by using a beam of electrons that is deflected by the voltage being measured, creating a visual representation on a screen. By observing the waveform on the screen, the peak to peak value of the AC voltage can be determined by measuring the vertical distance between the highest and lowest points of the waveform.

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6.

Type of modulation used in visual section of a transmitter.

Positive A.M.
Negative A.M
F.M.
None of the above.

Correct Answer

A. Negative A.M

Explanation

Negative A.M. stands for Negative Amplitude Modulation, which is a type of modulation used in the visual section of a transmitter. In this type of modulation, the amplitude of the carrier signal is varied in such a way that it is inversely proportional to the amplitude of the modulating signal. This means that as the modulating signal increases in amplitude, the carrier signal decreases in amplitude, and vice versa. Negative A.M. is commonly used in television broadcasting to transmit video signals, as it allows for the transmission of both positive and negative-going video signals.

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7.

The Difference between video I.F. & audio I. F in TV transmitter is

4.43 MHz
3.50 MHz
5.50 MHz
None of the above.

Correct Answer

A. 5.50 MHz

Explanation

The correct answer is 5.50 MHz. In a TV transmitter, the video intermediate frequency (I.F.) and audio I.F. are different frequencies used to transmit the video and audio signals respectively. The difference between these two frequencies is 5.50 MHz.

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8.

Duration of vertical blanking is

4.7 microsecond
0.2 milli second
1.6 milli second
None of the above

Correct Answer

A. 1.6 milli second

Explanation

The duration of vertical blanking refers to the time interval during which the electron beam in a CRT (Cathode Ray Tube) television or monitor returns to the top of the screen after displaying the last line of the image. This blanking period allows for repositioning and refreshing of the electron beam. The correct answer, 1.6 millisecond, indicates that the vertical blanking lasts for 1.6 milliseconds.

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9.

Duration of horizontal sync pulse is

1. 64 microsecond
2. 1.6 milli second
3. 4.7 micro second
None of these

Correct Answer

A. 3. 4.7 micro second

Explanation

The duration of the horizontal sync pulse refers to the time it takes for the horizontal synchronization signal to be transmitted. In this case, the correct answer is 3. 4.7 microseconds, as it indicates that the synchronization signal lasts for 4.7 microseconds.

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10.

I.F. at output of TV Receiver tuner for video is

38.9 MHz
33.4 MHz
40.5 MHz
40.5 MHz

Correct Answer

A. 38.9 MHz

Explanation

The correct answer is 38.9 MHz. This is the frequency at which the TV Receiver tuner outputs the video signal.

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11.

A slotted antenna is used for

VHF
UHF
Both VHF & UHF
None of the above

Correct Answer

A. UHF

Explanation

A slotted antenna is used for UHF frequencies because it is specifically designed to operate efficiently in the UHF range. The slots in the antenna allow for better transmission and reception of UHF signals, as they are designed to match the wavelength of UHF frequencies. VHF frequencies require a different type of antenna to operate effectively, so a slotted antenna would not be suitable for VHF. Therefore, the correct answer is UHF.

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12.

The PDA used for TVRO is used for

Receiving signals
Transmitting signals
Both as (a) & (b) simultaneously
None of the above

Correct Answer

A. Receiving signals

Explanation

The PDA used for TVRO is primarily used for receiving signals. It is designed to capture and decode satellite signals to provide television programming. While it is possible for some PDAs to also transmit signals, the main purpose of a TVRO PDA is to receive signals rather than transmit them. Therefore, the correct answer is "Receiving signals."

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13.

Three Primary Colours in TV Transmission are

Red, Green, Blue
Red, Yellow, Blue
Red, Yellow, Blue
None of the above

Correct Answer

A. Red, Green, Blue

Explanation

The three primary colors in TV transmission are red, green, and blue. These colors are used because they can be combined in different intensities to create a wide range of colors that our eyes can perceive. By mixing different amounts of red, green, and blue light, all the colors visible on a TV screen can be produced. This is known as the RGB color model, which is widely used in electronic displays including televisions.

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14.

Colour Temperature of average day light is

3200 K
5600 K
6500 K
None of the above.

Correct Answer

A. 6500 K

Explanation

The correct answer is 6500 K. The color temperature of average daylight is typically around 6500 K. This refers to the color appearance of the light, with lower values indicating warmer, more yellowish light and higher values indicating cooler, bluish light. 6500 K is considered a neutral white light, similar to the color temperature of a clear blue sky.

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15.

Eye is more sensitive to

Red
Green
Blue
Violet

Correct Answer

A. Green

Explanation

The eye is more sensitive to green because the human eye contains more green receptors, known as cones, compared to red and blue receptors. These cones are responsible for detecting and processing different colors of light. The higher sensitivity to green light allows us to perceive green colors more accurately and distinguish various shades of green.

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Telecommunication Switching Systems And Network! Trivia Quiz

SPC stands

Quiz Preview

For two-stage network, the switching elements for M inlets with r blocks and N outlets with s blocks are given by

As per Nyquist criterion, the sampling rate is: Where fs is the signal frequency

To receive satellite signal feed is kept at ________________ of PDA.

Peak to peak value of an a.c. voltage can be measured with the help of ____________________

Type of modulation used in visual section of a transmitter.

The Difference between video I.F. & audio I. F in TV transmitter is

Duration of vertical blanking is

Duration of horizontal sync pulse is

I.F. at output of TV Receiver tuner for video is

A slotted antenna is used for

The PDA used for TVRO is used for

Three Primary Colours in TV Transmission are

Colour Temperature of average day light is

Eye is more sensitive to