ALTERNATING CURRENT AND VOLTAGE QUIZ

Sine wave A has a positive-going zero crossing at 45°. Sine wave B has a positive-going zero crossing at 60°. Which of the following statements is true?

Wave A leads wave B by 15°.

Wave A lags wave B by 105°.

Wave A lags wave B by 15°.

Wave A leads wave B by 105°.

TRUE ANSWER : ?
YOUR ANSWER : ?

A signal with a 400 s period has a frequency of

25,000 Hz

2,500 Hz

250 Hz

400 Hz

TRUE ANSWER : ?
YOUR ANSWER : ?

If the rms current through a 6.8 k resistor is 8 mA, the rms voltage drop across the resistor is

5.44 V

8 V

54.4 V

7.07 V

TRUE ANSWER : ?
YOUR ANSWER : ?

Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is

16.54 V

5.93 V

10.60 V

1.65 V

TRUE ANSWER : ?
YOUR ANSWER : ?

To produce an 800 Hz sine wave, a four-pole generator must be operated at

1,600 rps

800 rps

400 rps

200 rps

TRUE ANSWER : ?
YOUR ANSWER : ?

The average value of a 12 V peak sine wave over one complete cycle is

0 V

7.64 V

1.27 V

6.37 V

TRUE ANSWER : ?
YOUR ANSWER : ?

A sine wave of 15 kHz is changing at a faster rate than a sine wave with a frequency of

18 kHz

25 kHz

1.3 MHz

12 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

A sinusoidal current has an rms value of 14 mA. The peak-to-peak value is

39.6 mA

16 mA

22.6 mA

45.12 mA

TRUE ANSWER : ?
YOUR ANSWER : ?

A waveform has a baseline of 3 V, a duty cycle of 20%, and an amplitude of 8 V. The average voltage value is

4 V

4.6 V

1.6 V

11 V

TRUE ANSWER : ?
YOUR ANSWER : ?

A square wave has a period of 60 s. The first odd harmonic is

500 kHz

5 kHz

50 kHz

33.33 kHz

TRUE ANSWER : ?
YOUR ANSWER : ?

↑