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Quiz

Lesson 1: The Hot-Wire Ammeter and Single Element AC Circuits — Picture questions (exam style)

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1.
In the circuit (a resistor on an a.c. supply of fixed rms voltage) the frequency is divided by 4. Which option is correct?
In the circuit (a resistor on an a.c. supply of fixed rms voltage) the frequency is divided by 4. Which option is correct?
reactance × 1, ammeter × 1/4
reactance × 1/4, ammeter × 1/4
reactance × 4, ammeter × 4
reactance × 1, ammeter × 1
2.
A hot-wire ammeter carries 1 A d.c. plus a.c. of peak 8 A. Which option is correct?
A hot-wire ammeter carries 1 A d.c. plus a.c. of peak 8 A. Which option is correct?
hot-wire reading = 6.66 A, heating is 81× that of the d.c. alone
hot-wire reading = 6.66 A, heating is 66× that of the d.c. alone
hot-wire reading = 9 A, heating is 9× that of the d.c. alone
hot-wire reading = 5.74 A, heating is 33× that of the d.c. alone
3.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
pure inductor, 7.07 Ω
pure inductor, 10.0 Ω
resistor, 10.0 Ω
capacitor, 10.0 Ω
4.
In the circuit (a pure inductor on an a.c. supply of fixed rms voltage) the frequency is divided by 2. Which option is correct?
In the circuit (a pure inductor on an a.c. supply of fixed rms voltage) the frequency is divided by 2. Which option is correct?
reactance × 1/2, ammeter × 2
reactance × 2, ammeter × 1/2
reactance × 2, ammeter × 2
reactance × 1/2, ammeter × 1/2
5.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
capacitor, 10.6 Ω
pure inductor, 15.0 Ω
resistor, 15.0 Ω
capacitor, 15.0 Ω
6.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
The graph shows V and I against time for a single component in an a.c. circuit. Identify it and find its resistance/reactance.
resistor, 10.0 Ω
resistor, 7.07 Ω
pure inductor, 10.0 Ω
capacitor, 10.0 Ω
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