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MCQ – AC Fundamentals
#1. In a pure inductor the voltage wave form leads the current by...?
#2. The form factor of sinusoidal wave form is....?
#3. The instataneous voltage across a pure resistor is.... with current?
out of phase
#4. The reciprocal of frequency is known as....?
#5. Reactive power is given by....?
#6. Form factor is the ratio of....?
rms value / average value
average value x rms value
instantaneous value x rms value
average value / rms value
#7. The power factor of the inductive loading is....?
#8. Impedance at series resonance circuit is....?
none of the above
#9. Power factor is defined as....?
#10. In a AC series circuits Q factor is....?
#11. Power factor of R-C series circuit is.....?
between 0 and 1
greater than 1
#12. Capacitive reactance is......?
inversely proportional to frequency
directly proportional to frequency
directly proportional to capacitance
independent of frequency
#13. The ratio of Z/R is.....?
reciprocal of power factor
reciprocal of form factor
#14. Admittance is the reciprocal of....?
#15. The power factor of ordinary electric bulb is...?
slightly less than one
slightly more than one
#16. Unit of inductive reactance is....?
#17. Peak factor of a sinusoidal wave form is....?
#18. The rms value of a sine wave is 100A. Its peak value is...?
#19. The power factor of an AC circuit is equal to.....?
unity for a resistive circuit
sine of the phase angle
cosine of the phase angle
#20. Unit of reactive power is....?
#21. With in the increase in applied frequency, the dielectric loss will be....?
#22. With in the increase in applied frequency, the dielectric loss will be....?
#23. Q factor of a series R-L-C circuit possessing resonant frequency of 10 Hz and band width of 5 Hz is...?
#24. Power factor of an inductive circuit is usually improved by adding a capacitor to it in....?
either in series or parallel
#25. Form factor of a full rectified sine wave is...?
#26. Form factor of a half rectified sine wave is...?
rms / average = (Vm/2)/(Vm/pi) = 1.571
#27. An alternating current is given by i=14.14sin377t. find its rms value of current?
14.14/1.4 = 10A
#28. The ratio of maximum value to the rms value of an alternating quantity is called....?
#29. A seris RL circuit has a resistance of 30 ohms and an inductance of 40 ohms. The impedence is....?
Root of 900 1600 = 50
#30. The unit of capacitance is....?
#31. Two capacitors of 8 micro farad each are connected in series. the total capacitance is....?
#32. Capacitance is not affected by...?
distance between plates
#33. Two capacitors of 10 micro farad each are connected in parallel. the total capacitance is....?
#34. The capacitors opposition to alternating current is called...?
#35. In a capacitive AC circuit is the.....?
none of the above
current is inphase with voltage
current laggs voltage
current leads voltage
#36. Which condition is called as resonance RLC circuit?
#37. The line voltage in three phase delta connection is....?
Twice as phase voltage
none of these
same as the phase voltage
Thrice as phase voltage
#38. The line current in three phase star connection is....?
Thrice as phase current
none of these
same as the phase current
Twice as phase current
#39. Potential inside a hollow sphere charged with a voltage V is....?
#40. The reciprocal of impedance is...?
#41. Phase sequence is the order of attaining?
None of the above
#42. In a R.L.C series resonant circuit....?
#43. Two possible phase sequences are....?
#44. In a RLC resonant circuit magnification is.....?
#45. Three phase inter connection used in 3 phase 4 wire distribution system is.....?
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