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# Communication Systems Questions

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Amplitude modulation is the process of

Asuperimposing a low frequency on a high frequency

Bsuperimposing a high frequency on a low frequency

Ccarrier interruption

Dfrequency shift and phase shift

Explanation:

Modulating signal will have alower frequency as compared to the frequency of the carrier signal.

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The Shannon-Hartley law

Arefers to distortion

Bdefines bandwidth

Cdescribes signaling rates

Drefers to noise

Explanation:

In information theory, the Shannon–Hartley theorem tells the maximum rate at which information can be transmitted over a communications channel of a specified bandwidth in the presence of noise.

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The data transmission rate of a modem is measured in

Abytes per second

Bbaud rate

Cbits per second

Dmegahertz

Explanation:

Modems are generally classified by the maximum amount of data they can send in a given unit of time, usually expressed in bits per second (symbol bit(s), sometimes abbreviated "bps"), or bytes per second (symbol B(s)).

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Determine the total discharge time for the capacitor in a clamper having C = 0.01

A5ms

B25ms

C2.5ms

D50ms

Explanation:

The capacitor will fully charge or discharge in 5 time constants. So, 5*R*C= 25 ms.

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An image uses 512 x 512 picture elements. Each of the picture elements can take any of the 8 distinguishable intensity levels. The maximum entropy in the above image will be

A2097152 bits

B648 bits

C786432 bits

D144 bits

Explanation:

Each picture element can be represented by 3 bits. Thus total entropy = 512 x 512 x 3 = 786432.

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Light travels along the optical fibers by which mechanism?

ARefraction

BReflection

CScattering

DTotal internal reflection

Explanation:

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The term responsivity as it applies to a light detector is best described as

Athe time required for the signal to go from 10 to 90 percent of maximum amplitude

Bthe ratio of the diode output current to optical input power

Cthe ratio of output current to output power

Dthe ratio of output current to input current

Explanation:

Responsivity measures the input–output gain of a detector system. In the specific case of a photodetector, responsivity measures the electrical output per optical input.

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13 dBm is equivalent to

A2 mW

B20 W

C20 Mw

D2 MW

Explanation:

P(mW) = 1mW * 10(P(dBm)/ 10)
So, 1dBm = 1.258925mW

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A superheterodyne receiver with an IF of 450 kHz is tuned to a signal at 1200 kHz. The image frequency is

A750 kHz

B900 kHz

C1650 kHz

D2100 kHz

Explanation:

Image frequency = Signal frequency +2* IF = 1200 + 2*450 =2100kHz

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