Filters

Course Name:  Instrumentation
Quiz Number:  4
Teacher:  Teri A. Hamill, Ph.D.
Teacher's Email:  hamillt@fcae.nova.edu

Student Name:    
Student No:      
Student Email:

No. of Questions= 6


1.  If you wished to have a filter that provides very effective filtering, you would choose which of these options?
a) A first-order passive filter
b) A first-order active filter
c) A 6 dB/octave filter
d) Any of these would be equivalent
2.  A filter that allows frequencies below 10,000 Hz to go through, but rejects the passage of higher frequencies, would be called
a) A 10,000 Hz high-pass filter
b) A 10,000 hz low-pass filter
3.  Observe the figure in the picture below. What is its cut-off frequency?
     
a) 5 Hz
b) 200 Hz
c) 3500 Hz
d) 6000 Hz
Click on image to enlarge
4.  How many dB per octave is this filter?
a) 3
b) 6
c) 12
d) 18
e) 36
5.  Sound level measurement of a 250 Hz signal using the dB A scale
a) Would be higher than if read on the dB C scale
b) Would be lower than if read on the dB C scale
6.  Observe the dotted curve on the polar plot. A sound coming in from the front (0 degrees) is received as 75 dB SPL. If this same source moves to 270 degrees, the signal will now be __ degrees
a) 16 dB SPL
b) 59 dB SPL
c) 63 dB SPL
d) 91 dB SPL
e) No idea!
Click on image to enlarge



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