This set of Video Engineering Multiple Choice Questions & Answers focuses on “TV Broadcasting Systems and Video Monitors”.
1. What is the other name for black and white TV?
a) Monochrome TV
b) Color TV
c) QLED
d) Plasma
View Answer
Explanation: The other name for black and white TV is monochrome TV. The video signals obtained from TV camera tube are applied to a number of video amplifiers stages. For color TV transmitter, a color camera tube is required.
2. Which generator produces sets of pulses to operate the system at appropriate timings?
a) Induction
b) Signal
c) Synchronizing
d) Electrical
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Explanation: Synchronizing generator produces sets of pulses to operate the system at appropriate timings. Wave generating and shaping circuits are included in this unit. Examples are Clipping circuit, blocking oscillator circuit, and Multi vibrator circuit. The repetition rates of the pulse trains are controlled by frequency stabilized master oscillator.
3. The carrier frequency generated from a crystal controlled oscillator is passed through a number of frequency multiplier and amplifier stages in monochrome TV transmitter.
a) True
b) False
View Answer
Explanation: In monochrome TV transmitter the carrier frequency generated from a crystal controlled oscillator is passed through a number of frequency multiplier and amplifier stages. This results in a production of a carrier wave of desired frequency and energy content. The level of image signals, together with synchronizing and blanking pulses, is raised to modulate this carrier frequency.
4. Which carrier frequency is used in audio modulation in an FM transmitter for the purpose of audio signal transmission?
a) 10.5 MHz
b) 5.5 MHz
c) 7.5 MHz
d) 2.4 MHz
View Answer
Explanation: An FM transmitter is used for the purpose of audio signal transmission. The carrier frequency used in audio modulation is 5.5 MHz above that which is used in video modulation. Both sound and picture signals are transmitted by the same antenna by using a diplexer called picture (sound diplexer or combining network).
5. Which antenna is preferred for aerial TV receiver in monochrome TV receiver?
a) Loop
b) Dipole
c) Yagi-Uda
d) Helix
View Answer
Explanation: The TV signal radiated by the transmitter has to be intercepted. For this, an antenna with high gain, broad band, highly directional characteristics is used. Yagi-Uda multi element array is preferred. Impedance of the aerial should match the impedance of the transmission line. The aerial also selects the required signal and rejects unwanted signals.
6. Which power supply is used in the monochrome TV receiver?
a) Linear
b) Switched
c) SMPS
d) Battery based
View Answer
Explanation: Power supply of monochrome TV receiver requires various levels of DC voltages for the operation. So, 230 V, 50 Hz AC is rectified, filtered and regulated to provide ripple free steady voltage to various stages. However due to many advantages, switch mode power supplies (SMPS) are used.
7. Which three colors are used in color TV transmitter?
a) Red, green, blue
b) Orange, blue, green
c) Black, green, purple
d) Red, yellow, pink
View Answer
Explanation: The color camera generates three different voltages corresponding to three colors red, green and blue. These voltages are used for generating the luminance (Y) signals well as color difference signals (R-Y-B-Y) using suitable matrix, inverter and adder circuits.
8. What is the full form of VSB?
a) Vestigial synchronous band
b) Vestigial side band
c) Vertical side band
d) Vestigial synchronous base
View Answer
Explanation: In the color encoder, the R-Y and B-Y signals are quadrature modulated on a color subcarrier of 4.43 MHz. Then the Y signal and the C signal are added and they modulate the main video carrier using VSB (Vestigial side band) modulation also known as AMVSB – Amplitude modulated vestigial sideband.
9. Digital television is same as HD television.
a) True
b) False
View Answer
Explanation: The above statement is false. Digital television is not the same thing as HDTV (High Definition Television). HDTV describes a new television format (including a new aspect ratio and pixel density), but not how the format will be transmitted. Digital television can be either standard or high definition.
10. How many times more pixels do an HDTV have than the resolution of analog signal in a DTV?
a) 6
b) 2
c) 10
d) 4
View Answer
Explanation: High-definition television (HDTV) is not the same as DTV (Digital Television). HDTV refers to the resolution quality of the picture being broadcast. This is determined by the number of picture elements (pixels) across the screen and the number of rows down the screen. HDTV can have up to six times more pixels than the resolution of an analog signal, higher the resolution clearer the picture.
11. Which digital signal processing technique takes preventive measures to protect the transport streams from errors caused by noise and interference in the transmission channel in DTV transmitter and receiver?
a) FEC (Forward Error Correction)
b) AGC (Automatic Gain Control)
c) VDU (Visual Display Unit)
d) RFID (Radio Frequency Identification)
View Answer
Explanation: The FEC encoder takes preventive measures to protect the transport streams from errors caused by noise and interference the transmission channel. Forward error correction (FEC) is a Digital Signal Processing technique used to enhance data reliability. It does this by introducing redundant data called error correcting code, prior to data transmission or storage. FEC includes Reed-Solomon coding, Outer interleaving, and convolutional coding.
12. What is the other name for video monitor?
a) SSD
b) CCU
c) VSU
d) VDU
View Answer
Explanation: A video monitor is also known as VDU (visual display unit) is a display device similar to a television set, used to monitor the output of a video generating device, such as play-out from the video server, IRD (Integrated receiver/decoder), video camera, VCR, or DVD player.
13. Which sync signals ensure that the scanning action of the electron beam down and across the screen is in synchronization in video monitors?
a) Horizontal
b) Left and right
c) Vertical
d) Horizontal and vertical
View Answer
Explanation: The 3 main input signals in a video monitor are:
i) Video signal
ii) Horizontal Synchronization
iii) Vertical Synchronization
The video signal contains the R, G and B video signals that are applied to the picture tube. The horizontal and vertical sync signals ensure that the scanning action of the electron beam down and across the screen is in synchronization.
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