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Module 3: Electrical Fundamentals (B1) :!: > 3.16: Filters > Flashcards

3.16: Filters Flashcards

1
Q
  1. A Band Stop Filter passes
    (a) All low frequencies
    (b) Only frequencies above and below a particular band of frequencies.
    (c) Only frequencies in the FM band.
A

(b) Only frequencies above and below a particular band of frequencies.

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2
Q
  1. A Bandpass filter passes:
    (a) all low frequencies
    (b) all high frequencies
    (c) only a particular frequency
A

(c) only a particular frequency

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3
Q
A

(b) Low Pass Filter

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4
Q
A

(c) Band Pass filter

band Pass filter - inductor and capacitor in Parallel with each other
P for pass and p for parallel

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5
Q

20.A filter used to remove a group of frequencies from reaching the next stage of a
circuit is commonly called a:
(a) Bandstop filter
(b) Bandpass filter
(c) Highpass filter

A

(a) Bandstop filter

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6
Q
  1. The range of frequencies that a filter will pass or remove is commonly referred to
    as the filter’s:
    (a) Resonant frequency
    (b) Bandwidth
    (c) Shape factor
A

(b) Bandwidth

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7
Q
  1. The circuit diagram shown below shows that :
    (a) the frequency does not influence the output voltage
    (b) High frequencies can pass
    (c) Low frequencies can pass
A

(c) Low frequencies can pass

To remember: RC cars young kids play with
= RC (Resistor Capacitor) in series low (young age) frequencies can pass
Invert for inductor i.e IR - Inductor Resistor in series same effect

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8
Q
A

(b) High frequencies can pass

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9
Q
  1. A capacitor connected across a DC power supply is user to filter out (REMOVE):
    (a) DC Voltage
    (b) Lower frequencies
    (c) Higher Frequencies
A

(c) Higher Frequencies

A capacitor is a Low pass filter
Fuel system measures capaciance and fuel is normally low

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10
Q
  1. In a parallel R, L, C circuit, the value of the capacitor is quadrupled, then the value
    of the impedance would
    (a) reduce
    (b) increased
    (c) remain the same
A

(a) reduce

Capacitors reduce impedance, inductors increase it

Remember: Xc = 1 / 2(pi)(F)(C) - As capacitance or frequency increases, capacitive reactance decreases
XL = 2(pi)(F)(L) - As frequency or inductance increase so does inductive reactance

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11
Q
  1. In a tuned circuit at resonance, the circuit will be
    (a) inductive
    (b) resistive
    (c) capacitive
A

(b) resistive

Inductive and capacitive cancel each other out

Capacitors reduce impedance, inductors increase it

Remember: Xc = 1 / 2(pi)(F)(C) - As capacitance or frequency increases, capacitive reactance decreases
XL = 2(pi)(F)(L) - As frequency or inductance increase so does inductive reactance

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12
Q
  1. The impedance of a series tuned circuit at resonance is
    (a) zero
    (b) maximum
    (c) minimum
A

(a) zero

Inductive and capacitive cancel each other out

Capacitors reduce impedance, inductors increase it

Remember: Xc = 1 / 2(pi)(F)(C) - As capacitance or frequency increases, capacitive reactance decreases
XL = 2(pi)(F)(L) - As frequency or inductance increase so does inductive reactance

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13
Q
  1. A high pass filter has
    (a) high impedance to low frequency, low impedance to high frequency
    (b) high impedance to high frequency, low impedance to low frequency
    (c) high impedance to both high and low frequency
A

(a) high impedance to low frequency, low impedance to high frequency

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14
Q
  1. In a series LCR circuit at resonance, R = 100 ohms, L and C are each 10 ohms.
    The total impedance is
    (a) 100 ohms
    (b) 30 ohms
    (c) zero ohms
A

(a) 100 ohms

Inductive and capacitive cancel each other out

Capacitors reduce impedance, inductors increase it

Remember: Xc = 1 / 2(pi)(F)(C) - As capacitance or frequency increases, capacitive reactance decreases
XL = 2(pi)(F)(L) - As frequency or inductance increase so does inductive reactance

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15
Q
  1. A parallel circuit at resonance has its impedance at a
    (a) maximum
    (b) minimum
    (c) zero
A

(a) maximum

To remember: parallel train tracks give maximum resistance to trains

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16
Q
  1. A filter with a small bandwidth has
    (a) a high value of Q
    (b) a low value of Q
    (c) a Q of zero
A

(a) a high value of Q

Note: ‘Q’ is the quality of a filter

17
Q
  1. A circuit with good selectivity will have
    (a) a large bandwidth
    (b) a narrow bandwidth
    (c) a low L/C ratio
A

(b) a narrow bandwidth

18
Q

What type of filter is the below:

A
19
Q

What type of filter is the below:

A
20
Q

What type of filter is below:

A
21
Q

What type of filter is below:

A
22
Q

How would you contruct a band-stop filter?

A
23
Q

What is meant by a ‘‘Band stop’’ filter?

A
24
Q

What is meant by a ‘‘Band Pass’’ filter?

A
25
Q

In a Parallel RLC circuit, what happens if C is increased?

A

In a parallel RLC circuit, value of C is increased, Impedance would reduce

26
Q

What happens in a tuned circuit at resonance?

A

In a tuned circuit at resonance, the circuit will be resistive

(Capacitor cancelling out inductor)

27
Q

What is the impedance of a series tuned circuit at resonance?

A

The impedance of a series tuned circuit at resonance is zero

28
Q

What is the impedance of a parallel circuit at resonance?

A

A parallel circuit at resonance has its impedance at a maximum

29
Q

High Q would indicate?

A

‘Q’ is the quality of a filter

30
Q

Question Number. 1. Which is a high-pass filter?.
Option A. L type with series L and shunt C.
Option B. L type with series C and shunt L.
Option C. Resistor type with series C or L.

A

Option C. Resistor type with series C or L.

31
Q

Question Number. 2. A high pass filter will.
Option A. allow frequencies above a certain value to pass.
Option B. allow frequencies within a range to pass.
Option C. allow frequencies below a certain value to pass

A

Option A. allow frequencies above a certain value to pass.

32
Q

Question Number. 3. A band stop filter.
Option A. attenuates frequencies either side of a narrow range.
Option B. stops a narrow range of frequencies.
Option C. stops frequencies either side of a narrow range.

A

Option B. stops a narrow range of frequencies.

33
Q

Question Number. 5. A capacitor in series and inductor in parallel make what kind of filter?.
Option A. Low pass.
Option B. Band pass.
Option C. High pass.

A

Option C. High pass.

34
Q

Question Number. 6. A high pass filter has.
Option A. high impedance to high frequency, low impedance to low frequency.
Option B. high impedance to both high and low frequency.
Option C. high impedance to low frequency, low impedance to high frequency.

A

Option C. high impedance to low frequency, low impedance to high frequency.

35
Q

Question Number. 9. Band stop filter.
Option A. attenuates frequencies in a specified narrow band.
Option B. stops frequencies in a narrow band.
Option C. pass all frequencies in that band.

A

Option A. attenuates frequencies in a specified narrow band.

Attenuates means ‘‘to reduce’’. No filter will totally stop the unwanted filter band.

36
Q

Question Number. 11. A high pass filter consists of a.
Option A. capacitor in series and inductor in series.
Option B. capacitor in series and inductor in parallel.
Option C. an inductor in series and a capacitor in parallel.

A

Option B. capacitor in series and inductor in parallel.

Module 3: Electrical Fundamentals (B1) :!: (19 decks)

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