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Electrical Engineering - RL Circuits

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Exercise

"Loneliness is the most terrible poverty."
- Mother Teresa
1. 

A 1.5 k resistor and a coil with a 2.2 k inductive reactance are in series across an 18 V ac source. The power factor is

A. 564B. 0.564
C. 6.76D. 55.7

2. 

The voltages in Problem 5 are measured at a certain frequency. To make the resistor voltage less than the inductor voltage, the frequency is

A. increased
B. decreased
C. doubled
D. not a factor

3. 

In a series RL circuit, 12 V rms is measured across the resistor, and 14 V rms is measured across the inductor. The peak value of the source voltage is

A. 18.4 V
B. 26.0 V
C. 2 V
D. 20 V

4. 

Referring to Problem 18, the circuit impedance is

A. 458 –76°
B. 4.58 –76°
C. 45876°
D. 4.5876°

5. 

To increase the current in a series RL circuit, the frequency

A. should be increased
B. should be decreased
C. should be constant
D. cannot be determined without values




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