## Lakshya Education MCQs

Question: The phosphors for which of the following pair are 180° out of phase for vl, vc and vr?
Options:
 A. VC and VR B. VL and VR C. VC and VL D. None of the above

Earn Reward Points by submitting Detailed Explaination for this Question

## More Questions on This Topic :

Question 1. The r.m.s. value of pure cosine function is
1.     0.5 of peak value
2.     0.707 of peak value
3.     Same as peak value
4.     Zero
Question 2. If a sinusoidal wave has frequency of 50 hz with 30 a r.m.s. current which of the following equation represents this wave?
1.     42.42 sin 314 t
2.     60 sin 25 t
3.     30 sin 50 t
4.     84.84 sin 25 t
Question 3. Power factor of an inductive circuit is usually improved by connecting capacitor to it in
1.     Parallel
2.     Series
3.     Either A or B
4.     None of the above
Question 4. The r.m.s. value of half wave rectified sine wave is 200 v. the r.m.s. value of full wave rectified ac. will be
1.     282.8 V
2.     141.4 V
3.     111 V
4.     100 V
Question 5. If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is
1.     A sinusoid of the same frequency
2.     A sinusoid of half the original frequency
3.     A sinusoid of double the frequency
4.     Not a sinusoid