The slope of log-magnitude asymptote changes by - 40 dB/ decade at a frequency ω1. This means that

A)
a double pole is present
B)
a pole or zero at origin is present
C)
a pair of complex conjugate poles is present
D)
either a double pole or a pair of complex conjugate poles is present

Correct Answer : Option (D) :   either a double pole or a pair of complex conjugate poles is present

Explanation : A double pole or pair of complex poles result in - 40 dB/decade slope in log magnitude graph.

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For a quadratic factor in denominator of transfer function the phase angle at corner frequency (in Bode phase angle plot)
A)
is +90°
B)
is -90°
C)
depends on the damping factor
D)
None of the above

Correct Answer :   is -90°

The response to sinusoidal excitation can be found by
A)
setting s = jω in the network function
B)
setting s = -jω in the network function
C)
taking inverse transform of network function
D)
None of the above

Correct Answer :   setting s = jω in the network function

The resolution of a wire wound potentiometer is about
A)
5%
B)
1%
C)
0.1%
D)
0.001%

Correct Answer :   0.1%

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