Oscillators

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1. The circuit shown below is: a) an astable multivibrator b) a Wien bridge oscillator c) a triangle wave generator d) a ladder network oscillator.

2. In the circuit shown in Question 1, the frequency of oscillation is determined by: a) R3 and R4 b) R1, C1 and R2, C2 c) R3, C1 and R4, C2 d) R1, R3 and R2, R4.

3. In order to obtain oscillation in the circuit shown: a) R1 > 2 x R2 b) R3 > 2 x R4 c) R2 > 2 x R1 d) R4 > 2 x R3.

4. The circuit shown below is: a) an astable multivibrator b) a Wien bridge oscillator c) a triangle wave generator d) a ladder network oscillator.

5. In the circuit shown, the frequency of oscillation is determined by: a) R3 and R4 b) R1, C1 and R4, C2 c) R2, C1 and R3, C2 d) R1, R3 and R2, R4.

6. The output waveform produced by the circuit shown will be: a) a ramp wave b) a sine wave c) a square wave d) a triangle wave.

7. The component shown in the photo below is: a) a capacitor b) a transformer c) a quartz crystal d) a semiconductor diode.

8. A typical application for the component shown is: a) generating white noise for use when testing an amplifier b) acting as a source of voltage for a low-power oscillator c) stabilising the frequency of a high-frequency oscillator d) providing additional voltage gain required for oscillation.

9. The output waveform produced by the circuit shown will be: a) a ramp wave b) a sine wave c) a square wave d) a triangle wave.

10. The network comprising C1, R1, C2, R2, C3 and R3/R4 provides a phase shift of: a) 90 degrees b) 180 degrees c) 270 degrees d) 360 degrees.