Explore topic-wise InterviewSolutions in .

This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.

1.

Which term is used when signals move from one line to another?(a) path switching(b) space switching(c) line switching(d) cross-point switchingI got this question by my school teacher while I was bunking the class.The doubt is from Frequency Division Multiplexing topic in chapter Modulation of Analog Communications

Answer»

Correct choice is (b) SPACE switching

For explanation I would SAY: Space switching is the USED term for signals MOVING from one line to another.
Discussion
2.

FSK stands for ________(a) Frequency Segregation Keying(b) Frequency Section Keying(c) Frequency Signal Keying(d) Frequency Shift KeyingThis question was posed to me in quiz.This intriguing question comes from Frequency Translation in division Modulation of Analog Communications

Answer»

Correct ANSWER is (d) Frequency Shift Keying

For explanation I would say: FSK stands for Frequency Shift Keying. In FSK, information is transmitted through DISCRETE frequency changes in the carrier signal.
Discussion
3.

When analyzing a transmission line, its inductance and capacitance are considered as _________(a) distributed(b) lumped(c) equal reactances(d) equal impedancesI got this question in my homework.This interesting question is from Frequency Translation topic in section Modulation of Analog Communications

Answer»

The CORRECT choice is (a) DISTRIBUTED

The best explanation: For a TRANSMISSION line, inductance and capacitance are two components that are considered as distributed.
Discussion
4.

What effect will be seen on the resistance of a wire if we increase the frequency?(a) it will also increase(b) it starts to decrease(c) it will remain same(d) it starts changing periodicallyI had been asked this question by my college professor while I was bunking the class.Origin of the question is Frequency Translation topic in chapter Modulation of Analog Communications

Answer» CORRECT answer is (a) it will ALSO increase

Easy explanation: Skin effect becomes more and more apparent as FREQUENCY increases as skin depth becomes smaller. It is due to alternating current flowing through the outer surface of conducting material. It REFERS to the increase of wire resistance with frequency.
Discussion
5.

What is speed of radio waves in free space?(a) 3 x 10^6 m/s(b) 3 x 10^9 m/s(c) 300 x 10^6 m/s(d) 300 x 10^9 m/sThis question was posed to me by my school principal while I was bunking the class.I want to ask this question from Frequency Translation topic in section Modulation of Analog Communications

Answer»

Correct choice is (C) 300 x 10^6 m/s

Explanation: he speed of radio waves in free SPACE is same as the speed of light which is 3 x 10^8 m/s. It CAL ALSO be written as 300 x 10^6.
Discussion
6.

An antenna has “gain” as compared to ________(a) Helical antenna(b) Marconi antenna(c) Vertically polarized radiator(d) Isotropic radiatorI have been asked this question during an online exam.Query is from Frequency Translation topic in section Modulation of Analog Communications

Answer»

The correct ANSWER is (d) Isotropic RADIATOR

The explanation is: Isotropic radiator is CONSIDERED as an ideal antenna. So all the gains of any antenna is ESTIMATED by COMPARING with it only.
Discussion
7.

Ground waves are most effective when _________(a) it is above about 20MHZ(b) it is below about 3MHz(c) it is at microwave frequencies(d) usually in the UHF rangeThe question was asked in semester exam.My query is from Frequency Translation topic in chapter Modulation of Analog Communications

Answer»

The correct answer is (b) it is below about 3MHz

The EXPLANATION: Ground WAVE is GENERALLY preferred for long distance COMMUNICATION using frequencies that are below 3MHz. It can be used for short distance communication by using frequencies between 3 and 30MHZ.
Discussion
8.

The microwave frequency range is considered to start at ________(a) 1 GHz(b) 10 GHz(c) 100 GHz(d) 5 GHzThis question was addressed to me in semester exam.This intriguing question originated from Frequency Translation topic in division Modulation of Analog Communications

Answer» CORRECT choice is (a) 1 GHZ

The BEST explanation: Microwave frequency RANGE is CONSIDERED to be start at 1 GHz. It is standard and fixed.
Discussion
9.

What is the approximate reliability of a microwave system?(a) 90%(b) 99%(c) 99.99%(d) 90.99%This question was posed to me in unit test.This question is from Frequency Translation in division Modulation of Analog Communications

Answer»

Correct choice is (c) 99.99%

To explain I WOULD say: Microwave system is MOSTLY KNOWN for its reliability. Its reliability is of the ORDER of 99.99%.
Discussion
10.

TDMA stands for ________(a) Time Division Multiple Access(b) Time Domain Multiple Access(c) Time Division Mutual Access(d) Time Domain Mutual AccessI had been asked this question in a national level competition.Question is taken from Frequency Division Multiplexing in portion Modulation of Analog Communications

Answer»

The correct ANSWER is (a) TIME DIVISION Multiple Access

Explanation: TDMA STANDS for Time Division Multiple Access. It can be seen as a CHANNEL access method for shared-medium networks.
Discussion
11.

Which modulation is used by a microwave system?(a) FM(b) SSB(c) QAM(d) Either FM or SSB or QAMI got this question in an international level competition.This is a very interesting question from Frequency Translation topic in portion Modulation of Analog Communications

Answer» RIGHT choice is (d) EITHER FM or SSB or QAM

The EXPLANATION is: Microwave system is used for point-to-point communication links, which is the communication between two nodes. It can either USE frequency modulation or single sideband modulation or quadrature modulation.
Discussion
12.

Which term is used for moving PCM samples from one time slot to another?(a) time switching(b) space switching(c) phase switching(d) frequency switchingI have been asked this question in a national level competition.The origin of the question is Frequency Division Multiplexing topic in section Modulation of Analog Communications

Answer»

Correct choice is (a) time switching

The explanation is: Time switching is the USED term for MOVING PCM SAMPLES moving from one time slot to ANOTHER.
Discussion
13.

PSK stands for Pulse Shift Keying.(a) True(b) FalseThis question was addressed to me during an online interview.My question comes from Frequency Division Multiplexing topic in chapter Modulation of Analog Communications

Answer»

The correct CHOICE is (b) False

Explanation: PSK stands for PHASE Shift KEYING. It is a MODULATION scheme that conveys information by CHANGING the phase of carrier.
Discussion
14.

Power can be coupled into or out of a waveguide with a magnetic field probe.(a) True(b) FalseThis question was posed to me during an online exam.My doubt stems from Frequency Division Multiplexing in section Modulation of Analog Communications

Answer»

Correct answer is (b) False

To explain: A waveguide is a LINE through which electromagnetic waves are PASSED for various use. POWER can be coupled into or out of a waveguide not only with a magnetic field probe. It can also be coupled with an electric field probe. It can also be coupled through a HOLE in the waveguide.
Discussion
15.

What is the full form of LOS?(a) Level Of Signal(b) Line Of Sight(c) Loss Of Signal(d) Level Of SightThe question was posed to me in unit test.My query is from Frequency Division Multiplexing in section Modulation of Analog Communications

Answer»

The CORRECT choice is (b) Line Of SIGHT

For explanation: Line Of Sight is a line between TWO points. It is a STRAIGHT path between a transmitting antenna and a receiving antenna.
Discussion
16.

How we can define the satisfactory performance of an analog microwave system?(a) carrier to noise ratio that exceeds a given value(b) carrier to noise ratio that is below a given value(c) an ERP value that exceeds a given value(d) an ERP value that is below a given valueThis question was posed to me in examination.My question is based upon Frequency Division Multiplexing topic in chapter Modulation of Analog Communications

Answer» RIGHT choice is (a) carrier to noise ratio that exceeds a GIVEN value

Explanation: We can measure performance of an analog MICROWAVE SYSTEM by CALCULATING the carrier to noise ratio that exceeds a given value. It gives the signal to noise ratio.
Discussion
17.

RGB stands for ________(a) Red Green Brown(b) Red Green Black(c) Red Gold Blue(d) Red Green BlueI got this question in examination.The question is from Frequency Division Multiplexing in section Modulation of Analog Communications

Answer»

The correct answer is (d) Red Green Blue

To explain I WOULD say: RGB stands for Red Green Blue. It is an additive COLOR model in which red, green and blue light intensity and different shades are added together in various ways to reproduce a broad variety of COLORS.
Discussion
18.

How many lines are there in an NTSC signal?(a) 1024(b) 1856(c) 625(d) 525The question was posed to me by my school principal while I was bunking the class.Question is taken from Frequency Division Multiplexing topic in portion Modulation of Analog Communications

Answer»

The correct choice is (d) 525

The explanation is: NTSC stands for NATIONAL Television SYSTEM Committee. In NTSC, it is standardized fixed that it has total 525 lines.
Discussion
19.

Luminance refers to ________(a) contrast(b) diffusion(c) brightness(d) apertureThis question was addressed to me in exam.I'd like to ask this question from Frequency Division Multiplexing in section Modulation of Analog Communications

Answer»

The correct answer is (c) brightness

For EXPLANATION I WOULD SAY: Luminance refers to brightness. It is a photometric measure of LUMINOUS intensity per unit area of light travelling in a given direction.
Discussion
20.

TDR stands for ________(a) Total Distance of Reflection(b) Time Domain Response(c) Time Domain Reflectometry(d) Time Delay RatioI got this question in an interview for internship.My doubt stems from Practicality of Antenna in chapter Modulation of Analog Communications

Answer»

The correct option is (c) Time DOMAIN Reflectometry

To EXPLAIN: TDR stands for Time Domain Reflectometer. It is an ELECTRONIC INSTRUMENT that uses time domain reflectometry to locate FAULTS.
Discussion
21.

The number of circular polarization modes is _________(a) 1(b) 2(c) many(d) 3I got this question in quiz.I need to ask this question from Practicality of Antenna in division Modulation of Analog Communications

Answer»

The CORRECT ANSWER is (b) 2

The best I can explain: In circular polarization either the electric or MAGNETIC vector EXECUTES a circle which is further perpendicular to path of propagation. There are TWO circular polarization modes.
Discussion
22.

Which is the dominant for a circular waveguide?(a) TE 01(b) TM 01(c) TE 11(d) TM 11The question was posed to me at a job interview.My question is based upon Practicality of Antenna in portion Modulation of Analog Communications

Answer»

The correct choice is (c) TE 11

Explanation: Circular WAVEGUIDE supports TM and TE MODE, which stands for Transverse MAGNETIC waves and Transverse Electric waves RESPECTIVELY, but it does not support TEM, Transverse Electromagnetic waves, mode. A rectangular waveguide can’t propagate below some certain frequency. The dominant mode for it is TE 11 mode.
Discussion
23.

Too much antenna gain causes ________(a) jitter(b) high sensitivity(c) a very wide microwave beam(d) a very narrow microwave beamI have been asked this question in an interview.I would like to ask this question from Practicality of Antenna in chapter Modulation of Analog Communications

Answer»

Right ANSWER is (d) a very narrow microwave BEAM

For EXPLANATION: Measurement of gain of any antenna takes place by comparing it with the VALUE of isotropic antenna. Too much gain in antenna can cause a very narrow microwave beam.
Discussion
24.

The characteristic impedance of a waveguide is fixed.(a) True(b) FalseThis question was addressed to me in an internship interview.Question is taken from Practicality of Antenna in division Modulation of Analog Communications

Answer»

Right ANSWER is (b) False

Best explanation: Characteristic Impedance is the ratio of voltage amplitude to current amplitude of a propagating electromagnetic wave. The characteristic impedance of a WAVEGUIDE is not fixed. It depends on the frequency it carries. It also depends on the longer DIMENSION of its CROSS section.
Discussion
25.

NTSC stands for ________(a) National Television Systems Committee(b) National Television Security Committee(c) National Television Systems Council(d) National Television Security CouncilThis question was posed to me in semester exam.Origin of the question is Practicality of Antenna in portion Modulation of Analog Communications

Answer»

The correct ANSWER is (a) National TELEVISION SYSTEMS Committee

Easy explanation: NTSC stands for National Television Systems Committee. It is mostly used in North America. It was responsible for developing a set of protocols for television broadcast transmission and reception in the United States. Its specifications was drawn up by EIA.
Discussion
26.

NTSC specifications was drawn up by ________(a) FCC(b) IBM(c) Cisco(d) EIAThis question was posed to me by my college director while I was bunking the class.This is a very interesting question from Practicality of Antenna in chapter Modulation of Analog Communications

Answer»

Correct ANSWER is (d) EIA

Explanation: NTSC stands for National Television Systems Committee. It is MOSTLY USED in North America. It was RESPONSIBLE for developing a set of PROTOCOLS for television broadcast transmission and reception in the United States. Its specifications was drawn up by EIA.
Discussion
27.

What is the aspect ratio of a standard TV receiver?(a) 3:4(b) 525:625(c) 625:525(d) 4:3I had been asked this question in semester exam.The question is from Practicality of Antenna topic in chapter Modulation of Analog Communications

Answer»

Right CHOICE is (d) 4:3

For explanation: Aspect RATIO is an image projection attribute that describes the proportional relationship between the width of an image and its HEIGHT. Most COMMON video-graphic aspect ratio is 4:3.
Discussion
28.

Luminance is measured in ________(a) Decibels(b) IRE units(c) Lumins(d) NTSC unitsThe question was posed to me during an internship interview.The query is from Reduction of Noise topic in portion Modulation of Analog Communications

Answer»

The correct choice is (b) IRE units

Easy EXPLANATION: LUMINANCE refers to brightness. It is a photometric measure of luminous INTENSITY PER unit area of light travelling in a given direction. It is measured in IRE units.
Discussion
29.

The maximum luminance level is called ________(a) max white(b) peak white(c) all white(d) full whiteThe question was asked in quiz.This is a very interesting question from Reduction of Noise topic in section Modulation of Analog Communications

Answer»

Right choice is (B) peak white

Explanation: Luminance refers to brightness. It is a photometric measure of luminous intensity per UNIT area of light travelling in a given direction. It is MEASURED in IRE UNITS. The maximum luminance level is called peak white.
Discussion
30.

Which term is used for defining high and low points of a satellite’s orbit?(a) crest and trough(b) apogee and perigee(c) uplink and downlink(d) peak and sinkThis question was addressed to me in an internship interview.This interesting question is from Reduction of Noise topic in chapter Modulation of Analog Communications

Answer»

Right CHOICE is (b) apogee and perigee

Easy EXPLANATION: Apogee and Perigee are respectively the terms USED for defining high and low points of a SATELLITE’s ORBIT.
Discussion
31.

What is the power order of power level for an earth station to transmit to a satellite?(a) 104 watts(b) 103 watts(c) 100 watts(d) 101 wattsThis question was posed to me during a job interview.My question comes from Reduction of Noise in portion Modulation of Analog Communications

Answer»

Correct CHOICE is (b) 103 watts

The best EXPLANATION: The STANDARD power LEVEL of an earth station to transmit to a satellite is of the order of 103 Watts.
Discussion
32.

What is the full form of DBS?(a) direct broadcast satellite(b) decibels of signal(c) direct beam signal(d) direct broadcast signalThe question was asked in unit test.This question is from Reduction of Noise in section Modulation of Analog Communications

Answer» RIGHT answer is (a) DIRECT broadcast satellite

Easy explanation: DBS STANDS for direct broadcast satellite. In Direct Broadcast Satellite subscribers receives signal DIRECTLY from geostationary satellite.
Discussion
33.

Current PCs are referred as __________(a) first-generation(b) second-generation(c) third-generation(d) fourth-generationThe question was posed to me during an online exam.Question is from Reduction of Noise in division Modulation of Analog Communications

Answer»

Correct CHOICE is (b) SECOND-generation

For explanation I would say: Current PCs in TODAY’s time are REFERRED as second generation.
Discussion
34.

RCC stands for __________(a) Radio Common Carrier(b) Radio Central Carrier(c) Radio Control Carrier(d) Radio Cell CarrierI have been asked this question in an internship interview.Enquiry is from Reduction of Noise topic in section Modulation of Analog Communications

Answer»

The correct choice is (a) Radio Common Carrier

The best I can explain: RCC stands for Radio Common Carrier. It was introduced in 60’s. Like a radio it can also transmit VOICE COMMUNICATION through a push to talk system. But it used a PUBLIC telephone NETWORK and has its own telephone number.
Discussion
35.

Bluetooth uses ________(a) CDMA(b) Frequency hopping(c) QPSK(d) QAMThe question was asked during an internship interview.Query is from Reduction of Noise in section Modulation of Analog Communications

Answer»

The correct choice is (b) Frequency hopping

For EXPLANATION I would say: Bluetooth is a wireless TECHNOLOGY. It is USED for exchanging data over short distances. It USUALLY uses frequency hopping, in which the transmitter changes the carrier frequency with respect to a specific pattern.
Discussion
36.

ISM stands for _________(a) IEEE Standard Message(b) Industrial, Scientific and Messaging(c) Industrial, Scientific and Medical(d) IEEE Secure MessageI have been asked this question in quiz.My question comes from Reduction of Noise in section Modulation of Analog Communications

Answer»

Right choice is (c) Industrial, Scientific and Medical

To EXPLAIN: ISM stands for Industrial, Scientific and Medical. In it some RADIO FREQUENCIES are only used for Industrial, Scientific and Medical purposes not for telecommunications PURPOSE. Bluetooth uses ISM BAND.
Discussion
37.

Which band is used by Bluetooth in mobiles?(a) VHF band(b) UHF band(c) ISM band(d) HF bandI had been asked this question during an interview for a job.My enquiry is from Narrowbanding in division Modulation of Analog Communications

Answer»

Right answer is (c) ISM band

Easy explanation: BLUETOOTH is wireless technology. It is USED for exchanging DATA over short distances. It usually uses FREQUENCY HOPPING. It uses ISM band.
Discussion
38.

BSS stands for ________(a) Basic service Set(b) Basic service System(c) Bluetooth service Set(d) Bluetooth service SystemI have been asked this question in an interview.The above asked question is from Narrowbanding topic in portion Modulation of Analog Communications

Answer» RIGHT answer is (a) BASIC service Set

For explanation: BBS STANDS for Basic service Set. It is a term used to DESCRIBE the collection of stations which may COMMUNICATE with each other within an 802.11 network. It is used for telecommunication services.
Discussion
39.

What do you understand by the term CAPCODE?(a) an encryption scheme(b) an addressing scheme(c) an error-detection scheme(d) a decryption schemeThe question was posed to me in an interview.This intriguing question originated from Narrowbanding in chapter Modulation of Analog Communications

Answer» CORRECT answer is (b) an ADDRESSING SCHEME

The explanation: CAPCODE is only used as an addressing scheme.
Discussion
40.

What is the full form of MSC?(a) Mobile Service Cellular(b) Mobile Switching Center(c) Mobile Switching Control(d) Mobile Servicing CouncilThe question was asked in an interview.I'm obligated to ask this question of Narrowbanding topic in chapter Modulation of Analog Communications

Answer» RIGHT choice is (b) Mobile Switching Center

The best EXPLANATION: MSC STANDS for Mobile Switching Center. It is a 2G core NETWORK element that controls the network switching subsystem elements.
Discussion
41.

The “forward” PCs channel is ________(a) from the base to mobile(b) from the mobile to base(c) from mobile to mobile(d) from base to baseI got this question in an online interview.I'm obligated to ask this question of Narrowbanding topic in section Modulation of Analog Communications

Answer»

Right option is (a) from the base to mobile

Explanation: If the PCs CHANNEL is FORWARDED then it MEANS that SIGNAL goes from the base to the mobile.
Discussion
42.

LNA stands for __________(a) low noise amplifier(b) low noise amplification(c) low narrow amplification(d) low narrow amplifierThe question was posed to me in an interview.I would like to ask this question from Narrowbanding in section Modulation of Analog Communications

Answer»

Right answer is (a) low noise amplifier

To EXPLAIN: LNA stands for low noise amplifier. It is used to amplify possibly WEAK SIGNALS such as those as RECEIVED by an antenna.
Discussion
43.

What is the height of the geosynchronous orbit above the equator?(a) 3,578km(b) 35,780km(c) depends on escape velocity(d) depends on satellite velocityI got this question by my college director while I was bunking the class.I'm obligated to ask this question of Narrowbanding topic in section Modulation of Analog Communications

Answer»

Right answer is (B) 35,780km

For EXPLANATION: The height of the GEOSYNCHRONOUS ORBIT above the equator is approximately 35,780 km.
Discussion
44.

The “payload” in a communication satellite consists of _________(a) power amplifiers(b) batteries(c) transponders(d) transducersI have been asked this question by my school teacher while I was bunking the class.My query is from Narrowbanding in division Modulation of Analog Communications

Answer»

The CORRECT OPTION is (c) transponders

The best explanation: Transponders works as the PAYLOAD in any communication. It uses for receiving a radio SIGNAL and then AUTOMATICALLY transmits a different signal.
Discussion