Communications

For a four-quadrant linear multiplier, what is the output voltage, given input voltages of V_x = +2 V and V_y = –10 V?

A:

+2 V

B:

+1 V

C:

–2 V

D:

–1 V

Answer: C

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In AM, the carrier is changed by a modulating signal. What parameter of the carrier is changed?

A:

amplitude

B:

frequency

C:

pulse width

D:

phase

Answer: A

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Light may be propagated along a fiber-optic cable in which of the following modes?

A:

multimode step index

B:

single-mode step index

C:

multimode graded index

D:

all of the above

Answer: D

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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?

A:

θ_i > θ_c

B:

θ_i < θ_c

C:

θ_i = θ_c

D:

none of the above

Answer: A

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The intermediate frequency in a standard AM receiver is

A:

455 Hz.

B:

455 kHz.

C:

4.55 MHz.

D:

none of the above

Answer: B

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Questions for: Communications