The phosphors for which of the following pair are 180° out of phase for VL, VC and VR______?

Related Mcqs:

1. Two waves of the same frequency have opposite phase when the phase angle between them is_________?

   A. 360°
   B. 180°
   C. 90°
   D. 0°

2. In each of the three coils of a three phase generator, an alternating voltage having an r.m.s. value of 220 V is induced. Which of the following values is indicated by the voltmeters ______?

   A. 220 V
   B. 220V3V
   C. 220/V3 V
   D. none of the above

3. The power consumed in a circuit element will be least when the phase difference between the current and voltage is__________?

   A. 180″
   B. 90°
   C. 60°
   D. 0°

4. The phase difference between voltage and current wave through a circuit element is given as 30°. The essential condition is that

   A. both waves must have same frequency
   B. both waves must have identical peak values
   C. both waves must have zero value at the same time
   D. none of the above

5. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is____________?

   A. a sinusoid of the same frequency
   B. a sinusoid of half the original frequency
   C. a sinusoid of double the frequency
   D. not a sinusoid

6. If two sine waves of the same frequency have a phase difference of JT radians, then_______?

   A. both will reach their minimum values at the same instant
   B. both will reach their maximum values at the same instant
   C. when one wave reaches its maxi¬mum value, the other will reach its minimum value
   D. none of the above

7. The power consumed in a circuit element will be least when the phase difference between the current and voltage is________?

   A. 180″
   B. 90°
   C. 60°
   D. 0°

8. The product of apparent power and cosine of the phase angle between circuit voltage and current is

   A. true power
   B. reactive power
   C. volt-amperes
   D. instantaneous power

9. In a three-phase supply floating neutral is undesirable because it way give rise to___________?

   A. high voltage across the load
   B. low voltage across the load
   C. unequal line voltages across the load
   D. minimun voltage across the load

10. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value________ ?

    A. 0°
    B. 45°
    C. 90°
    D. 180°