PHY2049 - GENERAL PHYSICS II
PRACTICE QUIZ 29

Below you will find a set of 5 conceptual and numerical revision questions selected randomly from lots of questions I have put together covering the material in Chapter 29, "Alternating-Current Circuits". This includes questions on ac generators, alternating current in resistors, inductors and capacitors, phasors, RCL circuits with a generator and transformers. When you have finished the quiz, click on the "Submit Quiz" button at the bottom and within seconds it will be automatically graded and the results returned to you!

To select a new set of questions click on the "Reload" or "Refresh" button on your browser. You may find some of the questions duplicated but that's the nature of a random selection. Try it a few times ... it's not fattening and you may learn something!

Many thanks to Mark Wood for producing the quiz-maker code.


Q1: How much does the maximum emf produced by a generator (a rotating coil) change if its magnetic field is halved?

It is the same
It is increased by a factor of 16
It is decreased by a factor of 2
It is increased by a factor of 4
It is impossible to tell given the information provided.

Q2: The graph shows the voltage across and the current through a certain circuit element connected to an ac generator.

What is the rms voltage across this element?

49.5 V
70 V
112 V
140 V
170 V


Q3: Which one of the following graphs shows how inductive reactance varies with frequency?



a
b
c
d
e


Q4: An ac generator supplies an rms (not peak) voltage of 180 V at 60 Hz. It is connected in series with a 0.5 H inductor, a 6 μF capacitor and a 300 Ω resistor. What is the inductive reactance?

150 Ω
190 Ω
360 Ω
390 Ω
440 Ω

Q5: An ac generator supplies an rms (not peak) voltage of 180 V at 60 Hz. It is connected in series with a 0.5 H inductor, a 6 μF capacitor and a 300 Ω resistor. What is the phase angle for this circuit?

26°
-32°
38°
-40°
50°

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