Try the following questions to test your knowledge of Chapter 24. Once you have completed the questions, click on the 'Submit Answers for Grading' button at the bottom of this page to get your results.

This activity contains 10 questions.

	The conditions for oscillation to occur are described by which of the following?   The Barkhausen criterion. Faraday's law. Nyquist's theorem. Lenz's law.

	Calculate the frequency of oscillation of the phase-shift oscillator shown here.   26 Hz 65 Hz 135 Hz 238 Hz

	Calculate the frequency of oscillation of the Wien-bridge oscillator shown here.   159 Hz 238 Hz 327 Hz 424 Hz

	A thermister can be used to stabilise the gain of simple oscillators.    True  False

	What is the maximum positive output voltage of the relaxation oscillator shown here?   Vpos Vpos/2 Vpos/4 (C/R)Vpos

	Crystals have two resonant frequencies.    True  False

	What elements are found within the equivalent circuit of a crystal?   Resistance alone. Resistance and capacitance. Resistance and inductance. Resistance, capacitance and inductance.

	What form of oscillator is shown here?   An RC oscillator. A Colpitt's oscillator. A Pierce oscillator. A Wien-bridge oscillator.

	In order to ensure stability in a circuit, the designer must ensure that the phase shift reaches 180 degrees before the gain falls to unity.    True  False

	What is the name given to the amount (in dB) by which the loop gain is less than 0 dB when the phase reaches 180 degrees?   The zero-gain bandwidth. The transition point. The phase margin. The gain margin.

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