Communications - General Questions Online Exam Quiz
Communications - General Questions GK Quiz. Question and Answers related to Communications - General Questions. MCQ (Multiple Choice Questions with answers about Communications - General Questions
A certain fiber-optic cable has the following characteristics: n 1 = 1.82 and n 2 = 1.73. What is the value of ? c ?
Options
A : 71.90º
B : 0.95º
C : 18.1º
D : 1.81º
An AM demodulator can be implemented with a linear multiplier followed by a ________ filter.
Options
A : low-pass
B : high-pass
C : band-pass
D : band-stop
The intermediate frequency in a standard AM receiver is
Options
A : 455 Hz.
B : 455 kHz.
C : 4.55 MHz.
D : none of the above
In order for a light ray to propagate along a fiber-optic cable, what must the relationship be between the angle of incidence and the critical angle?
Options
A : ? i > ? c
B : ? i < ? c
C : ? i = ? c
D : none of the above
Light may be propagated along a fiber-optic cable in which of the following modes?
Options
A : multimode step index
B : single-mode step index
C : multimode graded index
D : all of the above
In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?
Options
A : amplitude
B : frequency
C : pulse width
D : phase
For a four-quadrant linear multiplier, what is the output voltage, given input voltages of V x = +2 V and V y = –10 V?
Options
A : +2 V
B : +1 V
C : –2 V
D : –1 V
The output spectrum of a ________ modulator includes upper-side and lower-side frequencies and the carrier frequency.
Options
A : balanced
B : standard amplitude
C : none of the above
D : -
Amplitude modulation is a ________ process.
Options
A : multiplication
B : division
C : sum/difference
D : -
What does VCO stand for?
Options
A : Visually-Controlled Organization
B : Voltage-Controlled Oscillator
C : Voltage-Centered Oscilloscope
D : -
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