# Measurements

### Explanation of question 20

- i An absorption frequency meter requires a power supply
- ii A dip oscillator requires a power supply

1. i and ii are both true
2. i is true but ii is false
3. i is false but ii is true
4. i and ii are both false

The answer is :- 3 An absorption frequency meter is powered from an external tuned circuit, and as such requires no power supply. The dip oscillator does require a power supply.

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