Online Electronics and Communication Engineering Test - Satellite Communication Test

Instruction:

This is a FREE online test. Beware of scammers who ask for money to attend this test.
Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
DO NOT refresh the page.
All the best!

The ending part of the popular teleserial Mahabharat will be beamed to the viewers

WESTAT

INSAT-IC

ARABSAT

INSAT-ID

[#]

A communication satellite is a repeater between

a transmitting station and a receiving station

a transmitting station and many receiving station

many transmitting station and many receiving station

none

[#]

At present, the radio-frequency band mainly used by most satellites is

EHF

UHF

VHF

SHF

[#]

In communication satellites, the up-link normally operates at a higher frequency than the down-link because it

gives a narrow beam shining into space

results in lesser signal attenuation

gives better beam-shaping

is easier to polarize a high frequency beam

[#]

A 20 m antenna gives a certain uplink gain at frequencies of 4/6 GHz. For getting same gain in the 20/30 GHz band, antenna size required is metre.

100

[#]

While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of

[#]

In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.

34 and 106

52 and 88

106 and 142

34 and 142

[#]

In a stop-and-wait ARQ system, the transmitting terminal

waits for positive or negative acknowled-gement from the receiving terminal after sending a block

sends another block if positive acknowledge is received through ACK character

resends the previous block if negative acknowledgement is received through a NAK character

does not wait for acknowledgement after sending a block

[#]

Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.

INSAT-IA

INSAT-IB

INSAT-IC

INSAT-ID

[#]

10.

To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required

[#]

11.

A telephone user while talking to a person via a satellite has to wait for reply for about __________ millisecond.

100

270

470

540

[#]

12.

The echo heard by a telephone user on a satellite channel can be removed by using

a vocoder

a multiplexer

echo suppressor

digital techniques

[#]

13.

The life time of a geosynchronous communication

[#]

14.

Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.

28000

15000

36000

11100

[#]

15.

Which statement out of the following statement is wrong?

Attenuation of satellite signals by rain and fog varies almost inversely with the angle of elevation

At 12/4, GHz link frequencies, signal power loss due to rain and fog is much greater than at 4/6 GHz frequencies

The distance between satellite and Earth station varies slightly with angle of elevation

At present 4/6 GHz geostationary satellites are being parked in geosynchronous, orbits at least 10° apart

[#]

16.

The degradation of satellite solar cells with time is mainly due to

their bombardment by electrons

collection of meteoric dust

increase in resistivity of silicon

gradual leakage of charge carriers from the semiconductor material

[#]

17.

The traffic-handling capacity of an Earth station on the uplink depends on

its EIRP

satellite antenna gain

noise associated with the satellite

all of the above

[#]

18.

The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as

Frequency Division Multiple Access (FDMA)

Time Division Multiple Access (TDMA)

Code Division Multiple Access (CDMA)

All of the above

[#]

19.

Point out the false statement.
Launching of geostationary experimental communication satellite has helped India to gain experience in

Building, for the time, a body-stabilized geosynchronous communication satellite with its own apogee propulsion and control systems

Attitude control and station management operations for a geostationary satellite

Building launching rocket Ariane for putting APPLE in orbit

Domestic communications on an experimental basis

[#]

20.

Master control facility (MCF) for INSAT-2 series satellites is located at

Madras

New Delhi

Leh

Hassan

[#]

Quick links

Quantitative Aptitude

Verbal (English)

Reasoning

Programming

Interview

Placement Papers

Online Electronics and Communication Engineering Test - Satellite Communication Test

Marks : 2/20

Test Review : View answers and explanation for this test.

Current Affairs

Interview Questions

Group Discussions