A25-Filters and Screening

Which of these is a low pass filter?
1. A
2. B
3. C
4. D
Which of these is a notch filter or band stop filter?
1. A
2. B
3. C
4. D
Which of these is a low pass filter?
1. A
2. B
3. C
4. D
Which of these is a band pass filter?
1. A
2. B
3. C
4. D
What is the most likely filter to select IF siganals after the mixer stage ina high quality CW receiver?
1. A band pass filter made up of capacitors and inductors with a bandwidth of 500 Hz
2. A band pass filter made up of capacitors and inductors with a bandwidth of 2.7 kHz
3. A crystal filter made up from crystals and capacitors with a bandwidth of 500Hz
4. A crystal filter made up from crystals and capacitors with a bandwidth of 2.7kHZ
The reason for screening one part of a radio from another is:
1. to ensure that signals will easily pass from stage to stage
2. to prevent solder spalshes that could short out components
3. to prevent signals from one part of a circuit transferring their energy to another part of the circuit
4. To prevent the risk of tools dropping on part of the circuit during construction