(MW2-2) Microwave, Standing Waves Exam

A high-pass filter lets low frequencies go through, but attenuates high frequencies.

1 True
2 False

A high-pass filter changes the frequency of low frequency signals.

1 True
2 False

A frequency-selective circuit designed to pass some frequencies and reject others is a(n)

1 tank circuit
2 filter
3 harmonic circuit
4 frequency doubler

The HPF allows:

1 Low frequencies to pass and filters out the high frequencies
2 High frequencies to pass and filters out the low frequencies
3 For the combined frequencies to be adjusted to a harmonic balance
4 The shape of the waveform to be clipped beyond it frequency balance

The HPF is used to:

1 Eliminate low frequencies which are produced by slow changes, such as a conductivity shift
2 Adjust the bandwidth to a neutral frequency in order to maximize depth of penetration
3 Remove any standing waves in the output signal
4 Shift the waveform from positive to negative when a rejectable defect is identified

The gain of High pass filter is defined to be the ratio of

1 The impedance to the impedance magnitude
2 The voltage amplitude to the impedance
3 The source voltage to the net resistance
4 The output to the input voltage
5 None of these

A high pass filter is a circuit that passes high

1 Impedance
2 Voltage sources
3 Frequencies
4 Resistance

A signal is said to be passed if the gain

1 Is equal to zero
2 Is greater than zero
3 Is equal to one
4 Is greater than one
5 Significantly greater than one

The cut off frequency of high pass filter is defined as

1 The end frequency of stop band region
2 The start frequency of pass band region
3 The frequency where amplitude decrease by 3 db from dc
4 All the above

For a filter, when frequency to be passed and frequency to be stopped are very close, attenuation rate near the cut off frequency should be

1 Low
2 Moderate
3 High
4 None of the above

What is this circuit called when used with sinusoidal signals?

1 A high pass filter
2 A differentiator
3 A low pass filter
4 An integrator

When the output voltage level of a filter decreases by ??? 3 dB, its absolute value changes by a factor of

1 ???2
2 1/ ???2
3 2
4 1/2

The frequency corresponding to half-power point on the response curve of a filter is known as

1 Cut off
2 Upper
3 Lower
4 Roll off

In a low-pass filter, the cutoff frequency is represented by the point where the output voltage is reduced to ??? per cent of the input voltage.

1 33.3
2 50
3 64.2
4 70.7

In a simple high-pass RC filter, if the value of capacitance is doubled, the cut-off frequency is

1 Doubled
2 Halved
3 Tripled
4 Quadrupled

At the cutoff frequency of a first-order high-pass filter, the phase shift is

1 -45 degrees
2 0 degrees
3 45 degrees
4 none of the above - phase shift depends on the value of the cutoff frequency

Capacitor appears at a low frequency signal as ---------- impedance

1 High
2 Loow

Capacitor appears at a high frequency signal as--------- impedance

1 High
2 Low

Inductor appears at a low frequency signal as---------- impedance

1 High
2 Low

Inductor appears at a high frequency signal as---------- impedance

1 High
2 Low

This frequency response graph is for a

1 Low pass filter
2 High pass filter
3 Band pass filter
4 Band reject filter

The letter C below indicates the filter

1 Stop band
2 Pass band
3 transition band
4 ripple

The letter B below indicates the filter

1 Stop band
2 Pass band
3 transition band
4 ripple

The letter A below indicates the filter

1 Stop band
2 Pass band
3 transition band
4 ripple