A phasor represents
Answer: Option A
Explanation:
The phasor diagram represents both the magnitude and phase angle.
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?
Option A is the correct option. Because if you plot the graph as angles on x-axis a and respective variable(voltage or current) on y-axis, you will observe that wave A is 15 degrees before that of wave B. Therefore you can say wave A leading wave B by 15 degrees.
If a sine wave goes through 10 cycles in 20 μs, the period is
Answer: Option C
Period = Time/Cycle = 20/ 10 = 2
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
peak source voltage= (v1rms+v2rms)*1.414 = (7.5+4.2)*1.414 = 16.54
When a sine wave has a frequency of 100 Hz in 12 s it goes through
Answer: Option D
Frequency = Number of cycles / Unit time No of cycles = Frequency * Unit time Frequency =100Hz Time=12s No of cycles = 100*12= 1200 cycles
