AC Fundamentals

#1. 1

120*

180*

90*

60*

#2. 2

1.414

3.14

1.11

1.57

#3. 3

leads

in phase

out of phase

lags

#4. 4

time constant

resonance

time period

amplitude

#5. 5

VI Sin $

VI Cos$

VIR

VI

#6. Form factor is the ratio of….?

average value x rms value

average value / rms value

instantaneous value x rms value

rms value / average value

#7. The power factor of the inductive loading is….?

unity

leading

lagging

zero

#8. Impedance at series resonance circuit is….?

average

none of the above

minimum

maximum

#9. Power factor is defined as….?

kVA/kW

kW/kVA

kW/kVR

kVAR/kVA

#10. In a AC series circuits Q factor is….?

cos$

1/cos$

1/sin$

sin$

#11. Power factor of R-C series circuit is…..?

1

0

greater than 1

between 0 and 1

#12. Capacitive reactance is……?

independent of frequency

directly proportional to capacitance

directly proportional to frequency

inversely proportional to frequency

#13. The ratio of Z/R is…..?

reciprocal of power factor

power factor

form factor

reciprocal of form factor

#14. Admittance is the reciprocal of….?

resistance

impedence

susceptance

reactance

#15. The power factor of ordinary electric bulb is…?

slightly more than one

zero

one

slightly less than one

#16. Unit of inductive reactance is….?

weber

ohm

milli hentry

hentry

#17. Peak factor of a sinusoidal wave form is….?

1

1.41

1.11

1.21

#18. The rms value of a sine wave is 100A. Its peak value is…?

200 A

100 A

160 A

141 A

#19. The power factor of an AC circuit is equal to…..?

unity for a resistive circuit

cosine of the phase angle

one

sine of the phase angle

#20. Unit of reactive power is….?

watt

ohm

VAR

VA

#21. With in the increase in applied frequency, the dielectric loss will be….?

one half

decrease

same

increase

#22. With in the increase in applied frequency, the dielectric loss will be….?

decrease

one half

same

increase

#23. Q factor of a series R-L-C circuit possessing resonant frequency of 10 Hz and band width of 5 Hz is…?

2

5.5

2.5

4

#24. Power factor of an inductive circuit is usually improved by adding a capacitor to it in….?

either in series or parallel

parallel

series

#25. Form factor of a full rectified sine wave is…?

1.11

1.571

1.41

1

#26. Form factor of a full rectified sine wave is…?

1.41

1.571

1

1.11

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 A

15 A

10 A

24 A

14.14/1.4 = 10A

#28. The ratio of maximum value to the rms value of an alternating quantity is called….?

average value

form factor

peak factor

mean value

#29. A seris RL circuit has a resistance of 30 ohms and an inductance of 40 ohms. The impedence is….?

70 ohms

40 ohms

50 ohms

90 ohms

Root of 900 1600 = 50

#30. The unit of capacitance is….?

hentry

ohm

watt

farad

#31. Two capacitors of 5 micro farad each are connected in series. the total capacitance is….?

8 mF

4 mF

16 mF

10 mF

8/2=4

#32. Capacitance is not affected by…?

distance between plates

dielectric material

plate area

frequency

#33. Two capacitors of 10 micro farad each are connected in parallel. the total capacitance is….?

20 mF

5 mF

10 mF

100 mF

#34. The capacitors opposition to alternating current is called…?

impedence

capacitance

capacitive reactance

resistance

#35. In a capacitive AC circuit is the…..?

current laggs voltage

current is inphase with voltage

none of the above

current leads voltage

#36. Which condition is called as resonance RLC circuit?

XL< XC

XL > XC

XL= XC

#37. The line voltage in three phase delta connection is….?

Twice as phase voltage

Thrice as phase voltage

same as the phase voltage

none of these

#38. The line voltage in three phase delta connection is….?

none of these

same as the phase current

Thrice as phase current

Twice as phase current

#39. Potential inside a hollow sphere charged with a voltage V is….?

V/2

2V

V

0

#40. The reciprocal of impedance is…?

conductance

resistance

admittance

susceptance

#41. Phase sequence is the order of attaining?

Maximum value

None of the above

Average value

RMS value

#42. In a R.L.C series resonant circuit….?

R=XL

R=Z

XL>XC

R=XC

#43. Two possible phase sequences are….?

RYB,YBR

RYB,RBY

BRY,RYB

RBY,YRB

#44. In a RLC resonant circuit magnification is…..?

WLC

Z

WL

WL/R

#45. Three phase inter connection used in 3 phase 4 wire distribution system is…..?

star

delta delta

star star

delta

AC Fundamentals

Results

#1. 1

#2. 2

#3. 3

#4. 4

#5. 5

#6. Form factor is the ratio of….?

#7. The power factor of the inductive loading is….?

#8. Impedance at series resonance circuit is….?

#9. Power factor is defined as….?

#10. In a AC series circuits Q factor is….?

#11. Power factor of R-C series circuit is…..?

#12. Capacitive reactance is……?

#13. The ratio of Z/R is…..?

#14. Admittance is the reciprocal of….?

#15. The power factor of ordinary electric bulb is…?

#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…..?

#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….?

#25. Form factor of a full rectified sine wave is…?

#26. Form factor of a full rectified sine wave is…?

#27. An alternating current is given by i=14.14sin377t. find its rms value of current?

#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….?

#30. The unit of capacitance is….?

#31. Two capacitors of 5 micro farad each are connected in series. the total capacitance is….?

#32. Capacitance is not affected by…?

#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…..?

#36. Which condition is called as resonance RLC circuit?

#37. The line voltage in three phase delta connection is….?

#38. The line voltage in three phase delta connection is….?

#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?

#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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