Question 1

The _____________speech is also called as reported speech
A)direct
B)indirect
C)indefinite
D)definite

Accepted Answer

Indirect speech, also known as reported speech, involves conveying what someone else has said without quoting their exact words, often using a reporting verb and changing the tense of the original statement.

Question 2

For attenuation of high frequencies we should use
A)shunt capacitance
B)series capacitance
C)inductance
D)resistance

Accepted Answer

Shunt capacitance allows high-frequency signals to pass through it easily, effectively attenuating them by diverting them away from the main circuit path.

Question 3

A modem is classified as low speed if data rate handled is
A)upto 100 bps
B)upto 250 bps
C)upto 400 bps
D)upto 600 bps

Accepted Answer

D

Question 4

VSB modulation is preferred in TV because
A)it reduces the bandwidth requirement to half
B)it avoids phase distortion at low frequencies
C)it results in better reception
D)none of the above

Accepted Answer

VSB modulation is preferred in TV because it reduces the bandwidth requirement to half.

Question 5

A woofer should be fed from the input through a
A)low pass filter
B)high pass filter
C)band pass filter
D)band stop filter

Accepted Answer

A woofer is designed to reproduce low-frequency sounds, so it should be fed through a low pass filter to ensure only frequencies below a certain threshold are allowed through, filtering out higher frequencies.

Question 6

When the length of antenna is a whole wavelength
A)the radiation at right angles is zero
B)the radiation at right angles is maximum
C)the radiation is zero in all directions
D)the radiation is maximum in all directions

Accepted Answer

The answer of When the length of antenna is a...

Question 7

Circular polarization
A)is useful in reducing depolarization effect on received wave
B)involves critical alignment of transmitting and receiving antenna
C)is useful in discrimination between reception of adjacent beams
D)none of the above

Accepted Answer

Circular polarization is useful in reducing depolarization effect on received wave because it ensures that the wave remains polarized even after reflection from a surface.

Question 8

An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.
A)102.3
B)113
C)70.2
D)80.9

Accepted Answer

The image frequency $f_{image}$ for an FM radio receiver can be calculated using the formula $f_{image} = f_{RF} + 2f_{IF}$, where $f_{RF}$ is the received frequency (91.6 MHz in this case) and $f_{IF}$ is the intermediate frequency. For FM radio, the standard $f_{IF}$ is 10.7 MHz. Plugging these values into the formula gives $f_{image} = 91.6 MHz + 2(10.7 MHz) = 91.6 MHz + 21.4 MHz = 113 MHz$.

Question 9

For telegraphy the most commonly used modulation system is
A)fsk
B)two tone modulation
C)pcm
D)single tone modulation

Accepted Answer

Frequency Shift Keying (FSK) is the most commonly used modulation system for telegraphy because it allows for efficient transmission of binary data over a communication channel, such as the ones used in telegraph systems.

Question 10

Commercial Frequency deviation of FM is
A)70 khz
B)75 khz
C)80 khz
D)65 khz

Accepted Answer

Commercial Frequency deviation for FM broadcasting in many countries, including the United States, is 75 kHz. This is the maximum frequency difference from the carrier frequency that a signal can deviate.

Question 11

The colour of an object is decided by
A)the reflected colour
B)the wavelength transmitted through it
C)reflected colour for opaque object and wavelength transmitted through it for transparent objects
D)none of the above

Accepted Answer

The color of an object is determined by the light it reflects; for opaque objects, it's the reflected color we perceive. For transparent objects, it's the color of the light that passes through them (wavelength transmitted) that we see.

Question 12

In Pulse Code Modulation system
A)large bandwidth is required
B)quantising noise can be overcome by companding
C)quantising noise can be reduced by decreasing the number of standard levels
D)suffers from the disadvantage of its incompatibly with tdm

Accepted Answer

The answer of In Pulse Code Modulation system
A)large bandwidth is...

Question 13

Which of the following statements is correct?
A)convex lens has positive focal power and concave lens have negative focal power
B)convex lens has negative focal power and concave lens have positive focal power
C)all lens have positive focal power
D)all lens have negative focal power

Accepted Answer

Convex lenses converge light rays and thus have positive focal power, while concave lenses diverge light rays and have negative focal power.

Question 14

In Modulation, "carrier" is
A)resultant wave
B)speech voltage to be transmitted
C)voltage with constant frequency, phase or amplitude
D)voltage for which frequency, phase or amplitude is varied

Accepted Answer

The answer of In Modulation, "carrier" is
A)resultant wave
B)speech voltage to...

Question 15

To eliminate ghosts in the picture
A)use a longer transmission line
B)connect a booster
C)change the antenna orientation of location
D)twist the transmission line

Accepted Answer

Ghosts in television pictures are typically caused by the reception of multiple signals due to reflections. Changing the antenna's orientation or location can help receive a clearer, primary signal by minimizing or eliminating these reflections.

Question 16

The frequency range of 300 kHz to 3000 kHz is known as
A)low frequency
B)medium frequency
C)high frequency
D)very high frequency

Accepted Answer

The frequency range of 300 kHz to 3000 kHz is known as medium frequency. This range is often used for AM broadcasting among other applications.

Question 17

Which of the following does not cause losses in optical fibre cables?
A)stepped index operation
B)impurities
C)microbending
D)attenuation in glass

Accepted Answer

Stepped index operation is a design feature of optical fibers that helps in guiding light through the fiber, not a cause of loss. Losses in optical fibers are mainly due to impurities, microbending, and intrinsic attenuation in the glass material.

Question 18

A telephone channel requires a bandwidth of about
A)1 khz
B)3 khz
C)10 khz
D)50 khz

Accepted Answer

A typical telephone channel requires a bandwidth of about 3 kHz to adequately transmit the frequencies of human speech without significant loss of quality.

Question 19

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is
A)1
B)0.8
C)0.5
D)0

Accepted Answer

When the value of modulation is 1, it indicates perfect modulation, allowing for the maximum undistorted power to be transmitted without overmodulation.

Question 20

As per Shannon-Hartley theorem, a noise less Gaussian channel has
A)zero capacity
B)infinite capacity
C)small capacity
D)none of the above

Accepted Answer

The Shannon-Hartley theorem states that a noiseless Gaussian channel has an infinite capacity, meaning that theoretically, it can transmit an unlimited amount of information without errors if there is no noise in the channel.

Quiz 2: Communication and Radio Broadcasting

The _____________speech is also called as reported speech

For attenuation of high frequencies we should use

A modem is classified as low speed if data rate handled is

VSB modulation is preferred in TV because

A woofer should be fed from the input through a

When the length of antenna is a whole wavelength

Circular polarization

An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz.

For telegraphy the most commonly used modulation system is

Commercial Frequency deviation of FM is

The colour of an object is decided by

In Pulse Code Modulation system

Which of the following statements is correct?

In Modulation, "carrier" is

To eliminate ghosts in the picture

The frequency range of 300 kHz to 3000 kHz is known as

Which of the following does not cause losses in optical fibre cables?

A telephone channel requires a bandwidth of about

For a given carrier wave, maximum undistorted power is transmitted when value of modulation is

As per Shannon-Hartley theorem, a noise less Gaussian channel has