7/25/2019 I-II - EE105_ELS - Unit-II - Question Bank

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VIGNAN’S UNIVERSITY :: VADLAMUDI

EE105 – Electrical Science

UNIT – II

AC Circuit

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1. Define cycle?

2. Define Time period?

3. Define Frequency?

4. What is the frequency of AC supply?

. Define pea! "alue and pea! to pea! "alue?

#. Define $nstantaneous "alue?

%. Define A"era&e "alue?

'. Define ()* "alue?

+. Define Form Factor and ,ea! Factor 

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1-. ,hase an&le et/een "olta&e 0 current in a pure resistor is..

11. ,hase an&le et/een "olta&e 0 current in a pure inductor is..

12. ,hase an&le et/een "olta&e 0 current in a pure capacitor is..

13. A"era&e po/er in case of pure resistor is

14. A"era&e po/er in case of pure inductor is

1. A"era&e po/er in case of pure capacitor is

1#. What is $mpedance in case of a series ( circuit?

1%. What is $mpedance in case of a series (C circuit?

1'. What is $mpedance in case of a series (C circuit?

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1+. What is $mpedance at resonance?

2-. What is the po/er factor of the circuit at resonance?

21. Define resonance frequency?

22. What is the epression for series resonance frequency?23. What is the epression for parallel resonance frequency?

24. Define and /idth?

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1. A sin /a"e has a frequency of - 56 its an&ular frequency is 7777777777777 rad8sec.

2. An A.C current is &i"en y $ 9 14.14 sin :/t;3--< has an rms "alue of 7777777 A and a

 phase an&le of 77777777777777 de&rees.

3. Define an&ular frequency?

4. An a.c current is &i"en y $ 9 1-- sin 1--t .The frequency and pea! "alue is equal to

 7777777777777 

. The rms "alue of a half /a"e rectifier is 1- A= its "alue for full /a"e rectifier is equals

to77777777 

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#. Dra/ the phasor dia&rams of (esistor= $nductor and Capacitor /hen ecited /ith ac "olta&e

%. Dra/ the phasor dia&ram of a series ( circuit?

'. Dra/ the phasor dia&ram of a series (C circuit?

+. Dra/ the impedance trian&le in case of a series ( circuit?

1-. Dra/ the impedance trian&le in case of a series (C circuit?

11. What is po/er trian&le?

12. The acti"e po/er , 9

13. The (eacti"e po/er > 9

14. The apparent po/er * 9

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1. $n case of a three phase star connected circuit ine "olta&e 9

1#. $n case of a three phase delta connected circuit ine "olta&e 9

1%. $n case of a three phase star connected circuit ine current 9

1'. $n case of a three phase delta connected circuit ine current 91+. The total po/er consumed in a three phase system is equals to77777777777per phase

system

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1. T/o impedances :1-- ; #-< and :4 @ < are connected in series. Determine :i<. The

equi"alent impedance :ii<. ,o/er factor.

2. T/o impedances :1-- ; #-< and :4 @ < are connected in parallel. Determine :i<. The

equi"alent impedance :ii<. ,o/er factor.

3. Deri"e an epression for resonance frequency in case of a series (C circuit?

4. Deri"e an epression for resonance frequency in case of a parallel circuit :Tan! circuit<?

. Deri"e an epression for phase and line quantities in case of a three phase star connected

circuit?

#. Deri"e an epression for phase and line quantities in case of a three phase delta

connected circuit?

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1+ Find the form factor and pea! factor of the follo/in& 5W( /a"eform

'+ Find the form factor and pea! factor of the follo/in& FW( /a"eform

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,+ Find the follo/in& factors for the &i"en net/or!s i< qui"alent impedance :6< ii< ,o/er factor 

iii< Acti"e po/er i"< (eacti"e po/er "< Apparent po/er and "i< Currents :oth ma&nitude and

an&le<

-+ Find the follo/in& factors for the &i"en net/or!s i< qui"alent impedance :6< ii< ,o/er factor 

iii< Acti"e po/er i"< (eacti"e po/er "< Apparent po/er and "i< Currents :oth ma&nitude and

an&le<

5+ Find the follo/in& factors for the &i"en net/or!s i<qui"alent impedance :6< ii< ,o/er 

factor iii< Acti"e po/er i"< (eacti"e po/er "< Apparent po/er and "i< Current :oth

ma&nitude and an&le<

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.+ A "olta&e of :1-- ; #-< "olts dri"es a current of :4 @ < Amp throu&h a series (BBC

circuit. Determine :i< The impedance of the circuit :ii< ,o/er consumed :iii< ,o/er 

factor.

/+ :a< Deri"e the (esonant frequency for (C series circuit?

:< An inductance of 3-mh has a resistance of 2-ohm is connected in series to the

capacitance of +- micro farads across an "olta&e of 23- " then find i< (esonant

frequency ii< Current at resonance iii< and /idth i"< >uality factor "< ,o/er in the

circuit

+ :a< Deri"e the (esonant frequency for (C parallel circuit?

:< An inductance of 1mh has a resistance of 3ohm is connected in parallel to the

capacitance of #- micro farads across an "olta&e of 23- " then find i< resonant

frequency ii< current at resonance iii< and /idth i"< quality factor "< po/er in the

circuit.

+ Three similar impedances ha"in& resistances of ohms and inductances of -.-21 5enry are

connected in tar to a 4-- = 3 phase - 5 supply. Calculate in each case i< The line "olta&e ii<

The phase "olta&e iii< The line current i"< The phase current "< ,o/er dissipation per phase "i<

Total po/er :three phase po/er< dissipation

10. Three similar impedances ha"in& resistances of ohms and inductances of -.-21 5enry are

connected in 2elta to a 4-- = 3 phase - 5 supply. Calculate in each case i< The line

"olta&e ii< The phase "olta&e iii< The line current i"< The phase current "< ,o/er 

dissipation per phase "i< Total po/er :three phase po/er< dissipation.