What is the instantaneous peak voltage at 250� on a 6 V peak sine wave? +5.64 V

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Question
What is the instantaneous peak voltage at 250� on a 6 V peak sine wave?
Options
A. +5.64 V
B. ?5.64 V
C. +26.13 V
D. ?26.13 V

Correct Answer

?5.64 V

Alternating Current and Voltage problems

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2. In both induction and synchronous ac motors
Options
A. the operating speed is very steady
B. the stator magnetic field is stationary
C. the stator magnetic field rotates
D. the "squirrel cage" forms the rotor

4. Most practical alternators generate electricity from
Options
A. a coil rotating within a magnetic field
B. a magnetic field rotating around fixed windings
C. a permanent magnet rotating within a varying electromagnetic field
D. none of the above

5. The effective value of a sine wave is equal to
Options
A. 0.707 of peak voltage
B. 0.636 of peak voltage
C. sin 45� of peak voltage
D. both 0.707 of peak voltage and sin 45� of peak voltage

9. Which of the following statements is true about a lag network?
Options
A. An increase in frequency causes an increase in phase lag.
B. An increase in frequency causes an increase in the magnitude of the output voltage.
C. A decrease in frequency causes an increase in phase lag.
D. A decrease in frequency causes a decrease in the magnitude of the output voltage.

10. As frequency increases
Options
A. both series and parallel RL impedance decrease
B. series RL impedance decreases and parallel RL impedance increases
C. series RL impedance increases and parallel RL impedance decreases
D. both series and parallel RL impedance increase

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