What is a wave trap?

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RRB ALP Mechanic Radio & TV 23 Jan 2019 Official Paper (Shift 3)
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  1. Low pass filter
  2. High pass filter
  3. Wide band amplifier
  4. Resonance circuit

Answer (Detailed Solution Below)

Option 4 : Resonance circuit
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The correct option is 4

Concept:

1) Low pass filter - This allows signals with a frequency lower than a certain cutoff frequency to pass through but reduces the amplitude of frequencies higher than the cutoff frequency. This doesn't exactly match the characteristics of a wave trap.

2) High pass filter - This type of filter does the opposite of a low pass filter. It allows signals with a frequency higher than a certain cutoff frequency to pass through and attenuates frequencies below that. It's also not the best description of a wave trap.

3) Wideband amplifier - This device amplifies a wide band of frequencies. It doesn't seem to avoid a certain frequency like a wave trap would.

4) Resonance circuit - This type of circuit responds strongly to a specific frequency and less so to others. It can be designed to either favor or reject a certain frequency. A wave trap is essentially a type of resonant circuit that's tuned to a frequency that it 'traps' or blocks, hence preventing the frequency from passing through the circuit.

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