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06 Feb 2022: UPSC Exam Comprehensive News Analysis

CNA 06 Feb 2022:- Download PDF Here TABLE OF CONTENTS A. GS 1 Related B. GS 2 Related POLITY AND GOVERNANCE 1. Many Seats redrawn in J&K... View Article

05 Feb 2022: PIB Summary for UPSC

TABLE OF CONTENTS 1. Statue of Equality 2. ICRISAT 3. One District One Product 1. Statue of Equality Syllabus: GS I, Indian Heritage... View Article

What happens inside optical fibre?

1) Diffraction 2) Polarisation 3) Interference 4) Total internal reflection Answer: 4) Total internal reflection Solution:... View Article

The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is

1) 10% 2) 20% 3) 25% 4) 50% Answer: 4) 50% Solution: Vmax = 24/2 = 12 Vmin = 8/2 = 4 Modulation factor = (Vmax - Vmin)/(Vmax... View Article

The radio waves of frequency 300 MHz to 3000 MHz belong to

1) High Frequency band 2) Very high frequency band 3) Ultra high frequency band 4) Super high frequency band Answer: 3) Ultra high... View Article

A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the core cladding interface?

1) 60° 2) 75° 3) 45° 4) None of these Answer: 4) None of these Solution: Relative refractive index, (n1 - n2)/n1 =... View Article

In a diode AM-detector, the output circuit consists of R = 1 kΩ and C =10 pF. A carrier signal of 100 kHz is to be detected. Is it good

1) Yes 2) No 3) Information is not sufficient 4) None of the above Answer: 2) No Solution: For better demodulation... View Article

The frequency band used in the downlink of satellite communication is

1) 9.5 to 2.5 GHz 2) 896 to 901 MHz 3) 3.7 to 4.2 GHz 4) 840 to 935 MHz 5) 3.7 to 4.2 MHz Answer: 3) 3.7 to 4.2 GHz Solution:... View Article

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is

1) Amplitude modulation 2) Phase modulation 3) Frequency modulation 4) All of these Answer: 3) Frequency modulation Solution:... View Article

For efficient transmission of a 100 MHz frequency wave, the minimum length of an antenna should be

1) 3 m 2) (¾) m 3) 10 m 4) 100 m Answer: 2) (¾) m Solution: Height of the antenna = (1/4) x wavelength ... View Article

Suppose the amplitude of a modulated wave is equal to the signal amplitude. Then modulation is

1) 10% 2) 25% 3) 50% 4) 100% Answer: 4) 100% Solution: If the amplitude of a modulated wave is equal to the signal... View Article

Which of the following is related to telecommunication?

1) X-rays 2) r-rays 3) Sound wave 4) Microwaves Answer: 4) Microwaves Solution: Microwaves is used in telecommunication... View Article

For an amplitude modulated wave, the maximum amplitude is found to be 9V while the minimum amplitude is found to be 3V. The modulation index is____________

1) 100% 2) 75% 3) 50% 4) 25% Answer:50 % Solution: μ = [(Vmax - Vmin)/(Vmax + Vmin)] x 100 = [(9 - 3)/(9+ 3)] x 100 = (6/12) x 100 =... View Article

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Archives

06 Feb 2022: UPSC Exam Comprehensive News Analysis

05 Feb 2022: PIB Summary for UPSC

What happens inside optical fibre?

The maximum peak to peak voltage of an AM wire is 24 mV and the minimum peak to peak voltage is 8 mV. The modulation factor is

The radio waves of frequency 300 MHz to 3000 MHz belong to

A step index fibre has a relative refractive index of 0.88%. What is the critical angle at the core cladding interface?

In a diode AM-detector, the output circuit consists of R = 1 kΩ and C =10 pF. A carrier signal of 100 kHz is to be detected. Is it good

The frequency band used in the downlink of satellite communication is

When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is

For efficient transmission of a 100 MHz frequency wave, the minimum length of an antenna should be

Suppose the amplitude of a modulated wave is equal to the signal amplitude. Then modulation is

Which of the following is related to telecommunication?

For an amplitude modulated wave, the maximum amplitude is found to be 9V while the minimum amplitude is found to be 3V. The modulation index is____________

Device that transforms one form of energy into another form of energy is called a ___________

Which of the following is not a component of a communication system

In light modulation, which characteristic of the carrier light wave is varied?

Intensity of electric field of ground waves is ____________of the distance travelled by it

The bandwidth of the audio signal is

The advantage of optical fibre is

Which one of the following is an incorrect statement in the transmission of electromagnetic waves

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