# Satellite communication and Television systems - Electronics Engineering

## Satellite communication and Television systems - Electronics Engineering test questions

(1) In a satellite when does the concept of Epigee and perigee come into consideration?

(A) When the satellite is in geostationary orbit
(B) When the satellite is in Lower orbit
(C) When the satellite is in elliptical orbit
(D) When the satellite is in circular orbit

ANSWER: When the satellite is in elliptical orbit

(2) What is the use of Marisat satellite?

(A) Ship to shore communication
(B) Satellite to satellite communication
(C) Weather forecast
(D) TV transmission

(3) When the telephone conversation is via communication satellite, the waiting time is of the order of

(A) 1000 ms
(B) 540 ms
(C) 2 ms
(D) 680 ms

(4) The type of modulation used in satellite communication is

(A) PWM
(B) PCM
(C) FM
(D) AM

(5) The earth’s shadow falls on a geostationary orbit for

(A) 30 days
(B) 31 days
(C) 365 days
(D) 88 days

(6) Consider a satellite with time period of 2 hours. The height above the surface must be

(A) 2000 Km
(B) 3000 Km
(C) 4000 Km
(D) 1000 Km

(7) “The square of the period of revolution to the planet about the sun is proportional to the cubes of their mean distances from the sun”. This statement is based on

(A) Galileo’s hypothesis
(B) Kepler’s law
(C) Newton’s law
(D) None of the above

(8) Consider a satellite, where the radius of circular orbit is r. The orbital period of the satellite is proportional to

(A) r
(B) r²
(C) r³
(D) r³/²

(9) A satellite in low circular orbit than a geostationary orbit is known as

(A) Passive satellite
(B) Slow moving satellite
(C) Fast moving satellite
(D) Active satellite

(10) A communication satellite is a repeater between

(A) Many transmitting stations and many receiving stations
(B) One transmitting stations and many receiving stations
(C) One transmitting stations and one receiving stations
(D) Many transmitting stations and one receiving stations

ANSWER: Many transmitting stations and many receiving stations

(11) Consider a TV in which there is no brightness but sound is normal. The trouble could be in

(A) Vertical oscillator
(B) Horizontal oscillator
(C) RF amplifier
(D) Feeder

(12) Location of balun in a TV is between

(A) There is no balun in a TV receiver
(C) AGC stages

(13) Which one of the following circuit separates sync pulses from the composite video waveform?

(A) The keyed AGC amplifier
(B) A differentiator
(C) A clipper
(D) An integrator

(14) In a TV receiver the pulse used to keep the horizontal oscillator in synchronization during vertical blanking period is

(A) Equalizing pulse
(B) Blanking pulse
(C) Sync. pulse
(D) None of the above

(15) In India TV broadcasting system is as per CCIR

(A) System I
(B) System B
(C) System X
(D) System M

(16) In TV frames interlacing is used to

(A) Ensure scanning of all lines
(B) Produce illusion of motion
(C) Simplify the vertical sync pulse train
(D) Avoid flicker

(17) For TV system in India the maximum swing of the sound carrier is

(A) ±15 KHz
(B) ±20 KHz
(C) ±25 KHz
(D) ±10 KHz

(18) Which method of modulation of sound is used in India for TV system?

(A) Amplitude modulation
(B) Pulse code modulation
(C) Frequency modulation
(D) Phase modulation

(19) For broadcast purpose the camera that is most suitable is

(A) Image orthicon
(B) Icronoscope
(C) Isocon
(D) Standard vidicon

(20) The principle of operation of vidicon and plumbicon is

(A) Photo emission
(B) Photo conduction
(C) Photo voltaic
(D) Heat conduction

(21) A primary colour and its complementary differs from each other by the phase angle of

(A) 180°
(B) 90°
(C) 45°
(D) 0°

(22) A colour camera is

(A) Image orthicon camera
(B) Vidicon camera
(C) A combination of three or four monochrome cameras with optical accessories
(D) None of the above

ANSWER: A combination of three or four monochrome cameras with optical accessories

(23) In a picture tube of a colour TV, the shadow mask is used to

(A) Increase screen brightness
(B) Ensure that each beam hits own target
(C) Reduce X-ray emission
(D) None of the above

ANSWER: Ensure that each beam hits own target

(24) Another name for Y-signals is

(A) Multiplexed
(B) Chrominance
(C) Color-difference
(D) Luminance

(25) A high-frequency peak in a video amplifier frequency response curve will cause

(A) Sound interference
(B) Sync Buzz
(C) Static
(D) Ringing or spurious repeats in the image

ANSWER: Ringing or spurious repeats in the image