An ideal low-pass filter passes:

• High-frequency signals

• All signals equally

• Low-frequency signals

• Passes all frequencies equallyDC only

Laplace Transform of 2sintsint

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What is the output of an inverting amplifier if Vin = 2V and gain = –5?

• 2V

• -2V

• -10V

• 10V

The gain of a inverting op-amp is given by:

• -R2/R1

• 1 + R2/R1

• R1/R2

• R2 - R1

The Laplace Transform of e^(at) is:

• 1/(s + a)

• s + a

• 1/(s - a)

• s - a

A function has poles at s = −2, s=1 and s = −3, and zeros at s = −1. The order of the system is:

• 1

• 2

• 3

• 0

Given the transfer function H(s) = (s + 3)/[(s - 1)(s -2)], the poles are:

• s = −3

• s = −1 and −2

• s = 0

• s = 1 and 2

Answer explanation

Poles are the values of s that make the denominator zero.

For the block diagram reduction of two blocks in parallel G1(s) and G2(s), the equivalent is:

• G1(s) + G2(s)

• G1(s) × G2(s)

• G1(s)/G2(s)

• 1/[G1(s) + G2(s)]

The Barkhausen criteria for oscillators state that loop gain must be:

• 0

• 1

• Infinite

• Negative

A pole at s = –3 indicates:

• Stable System

• Marginally Stable

• Unstable System

• No effect in stability

Answer explanation

Poles on the left-half s-plane (negative real part) indicate a stable system.