PSWK - 2 Signal

Which of the following is an example of amplitude scaling?

• Electronic amplifier

• Electronic attenuator

• Both amplifier and attenuator

• Adder

Resistor performs amplitude scaling when x (t) is voltage, a is resistance and y (t) is output current.

• True

• False

Which of the following is an example of physical device which adds the signals?

• Radio

• Audio mixer

• Frequency divider

• Subtractor

AM radio signal is an example for __________

• y (t) = a x (t)

• y (t) = x1 (t) + x2 (t)

• y (t) = x1 (t) * x2 (t)

• y (t) = -x(t)

Which of the passive component performs differentiation operation?

• Resistor

• Capacitor

• Inductor

• Amplifier

Which of the component performs integration operation?

• Resistor

• Diode

• Capacitor

• Inductor

Time scaling is an operation performed on _______

• Dependent variable

• Independent variable

• Both dependent and independent variable

• Neither dependent nor independent variable

Y (t) = x (2t) is ________

• Compressed signal

• Expanded signal

• Shifted signal

• Amplitude scaled signal by a factor of 2

Y (t) = x (t/5) is _______

• Compressed signal

• Expanded signal

• Time shifted signal

• Amplitude scaled signal by factor 1/5

Considering Figure 1, sketch y= 2* x (t).

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