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Quizzes

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Exam:
1507 quizzes
A signal generator gives an AC voltage of frequency 750 Hz. What is its period? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A heating coil of 18 Ω is joined to an AC source of 45 V rms. What is the average power in it? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A pure coil of 90 mH is used at a frequency of 350 Hz. What is its reactance? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A technician lowers the frequency of a source to half its value, with the output voltage fixed. A pure capacitor is the only load. How does the current in the circuit change? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A capacitor of 3.3 µF is joined to a source of frequency 50 Hz. What is its reactance? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A student says: the average voltage of the mains over one cycle is zero, so a mains heater cannot get hot. Which reply is correct? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Hard
At 600 Hz the peak of the current in a circuit comes 0.45 ms before the peak of the voltage. By what angle does the current lead the voltage? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Hard
In a series LCR circuit the inductive reactance is larger than the capacitive reactance. Which statement is correct? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A series LCR circuit is capacitive at a low frequency. The frequency of the source is raised slowly, past the resonant frequency. What happens to the impedance on the way? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A toy radio has a 20 mH inductor and an 8 µF capacitor in series. For what frequency of the source, in hertz, is the current of this circuit the largest? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A series resonant circuit has a resonant frequency of 600 Hz and a quality factor of 25. How wide is the band between its half-power frequencies? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
An ideal coil is joined to an AC source. What is the average power it takes over a whole cycle, and why? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A series circuit has R = 10 Ω, XL = 31 Ω and XC = 7 Ω. It is joined to a source of 52 V (rms). How much average power does it take? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Hard
A student says: a step-up transformer has ten times as many turns in its secondary as in its primary, so it gives ten times as much power as it takes. What is wrong with this? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
Why is electric power sent over long distances at a very high voltage? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A cable of total resistance 6 Ω is fed with 36 kW at 4 kV. The power factor is 1. How much of the power is lost as heat in the cable? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
An LC circuit has no resistance. Which statement describes the circuit at the instant when the capacitor holds no charge? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
An inductor of 0.9 H and a capacitor of 10 µF are joined in a loop with no resistance. At what angular frequency does the charge oscillate? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Medium
A coil of 2 H has no resistance. It is joined across a capacitor of 8 µF that has been charged to 40 V. What is the largest current that flows? New
High School (11–12) · Alternating Current
A-LevelIBAEEE (Amrita)+19A-LevelIB
StemPy LabStemPy Lab
Hard
A student pushes a magnet into a coil of 55 turns. The flux through each turn rises from zero to 0.72 mWb in 36 ms. What is the average emf? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Medium
A copper ring lies flat on a table. A magnet is let fall towards it, north pole first, along the axis of the ring. While the magnet comes down, which way does the induced current turn in the ring, as seen from above? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Medium
Why must an induced current have the direction that opposes the change of flux that causes it? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Medium
A metal bar 0.72 m long slides at 3.9 m/s across a uniform field of 0.047 T. The bar, its velocity and the field are at right angles to one another. What is the emf between the ends of the bar? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Medium
The flux linkage of a coil is plotted against time and gives a straight line that slopes downwards. What does the emf of the coil do? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Hard
A closed circuit includes a coil of 65 turns, and its total resistance is 17 Ω. During 0.42 s the flux through each turn rises by 3.1 mWb. What total charge passes a point of the circuit? New
High School (11–12) · Electromagnetic Induction
APA-LevelIB+20APA-LevelIB
StemPy LabStemPy Lab
Hard
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