What is the typical frequency of AC power in North America

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Reference no: EM131663849

Q1. What is the phase angle of the voltage with respect to the current in a resistive circuit?

A. 45^o lagging

B. 0^o

C. 90^o leading

D. 45^o leading

Q2. The peak value of a sine wave is 80 VAC. What is the peak-to-peak value of this waveform?

A. 120 V

B. 160V

C. 40 V

D. 60 V

Q3. There are many different value associated with an AC sine wave. Which one of the following continually changes throughout the cycle?

A. instantaneous value

B. peak value

C. average value

D. effective value

Q4. What is the typical frequency of AC power in North America?

A. 60 Hz

B. 400 Hz

C. 50 Hz

D. 120 Hz

Q5. What is the average value of an AC voltage that has a maximum peak voltage of 80 VAC?

A. 56.56 VAC

B. 160 VAC

C. 50.88 VAC

D. 38.31 VAC

Q6. In a certain balanced three-phase system, each line current is 5 A and each line voltage is 220 V. What is the approximate real power, if the power factor is 0.7?

A. 1334 W

B. 1100 W

C. 154 W

D. 1770 W

Q7. Use the figure to answer the following question -

The four-wire, three -phase, 220 V, delta system shown in the figure includes a center tap of winding 1. A single-phase 120 V load may be safety connected between which has two wires.

A. C and N

B. A and N

C. B and C

D. A and B

Q8. An AC sine wave has an effective value of 100 V. What is the peak value of the waveform?

A. 96.3 V

B. 200 V

C. 141.4 V

D. 183 V

Q9. A full cycle of AC power consists of two

A. Alternations

B. Phases

C. Pulses

D. Degrees

Q10. When electric power is transmitted over long distances, line losses can be reduced by generating AC rather than DC voltage, and by transmitting

A. low voltage and high current

B. high voltage and low current

C. low voltage and low current

D. high voltage and high current

Reference no: EM131663849

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