AC Circuits Questions and Answers

78 A charged 30 uF capacitor is connected to a 27 mH inductor The angular frequency of free oscillations of the circuit is a 1 1 x 10 rad s c 3 1 x 10 rad s b 2 1 x 10 rad s d 4 1 x 10 rad s 79 An LC circuit contains a 40 mH inductor and a 25 F capacitor The resistance of the circuit is negligible
Physics
AC Circuits
78 A charged 30 uF capacitor is connected to a 27 mH inductor The angular frequency of free oscillations of the circuit is a 1 1 x 10 rad s c 3 1 x 10 rad s b 2 1 x 10 rad s d 4 1 x 10 rad s 79 An LC circuit contains a 40 mH inductor and a 25 F capacitor The resistance of the circuit is negligible
58 A series LCR circuit has R 5 2 L 40 mH and C 1 F the bandwidth of the circuit is a 10 Hz b 20 Hz c 30 Hz d 40 Hz In ICB circuit if re rer quality factor
Physics
AC Circuits
58 A series LCR circuit has R 5 2 L 40 mH and C 1 F the bandwidth of the circuit is a 10 Hz b 20 Hz c 30 Hz d 40 Hz In ICB circuit if re rer quality factor
59 The current flowing in a wire fluctuates sinusoidally as shown in the diagram The root mean square value of the current is i A 210 io Cari 2 1 1 2 c 2 2 io A t s b io 2 1 1 2 1 2 0 40 2 2 1 io
Physics
AC Circuits
59 The current flowing in a wire fluctuates sinusoidally as shown in the diagram The root mean square value of the current is i A 210 io Cari 2 1 1 2 c 2 2 io A t s b io 2 1 1 2 1 2 0 40 2 2 1 io
42 A 100 F capacitor in series with a 40 92 resistor is connected to a 100 V 60 Hz supply The maximum current in the circuit is a 2 65 A c 2 85 A b 2 75 A d 2 95 A
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AC Circuits
42 A 100 F capacitor in series with a 40 92 resistor is connected to a 100 V 60 Hz supply The maximum current in the circuit is a 2 65 A c 2 85 A b 2 75 A d 2 95 A
5 A sinusoidal voltage of peak value 293 V and frequency 50 Hz is applied to a series LCR circuit in which R 62 L 25 mH and C 750 F The impedance of the circuit is a 7 0 52 b 8 92 c 9 92 d 10 02
Physics
AC Circuits
5 A sinusoidal voltage of peak value 293 V and frequency 50 Hz is applied to a series LCR circuit in which R 62 L 25 mH and C 750 F The impedance of the circuit is a 7 0 52 b 8 92 c 9 92 d 10 02
37 A circuit containing a 2022 resistor and 0 1 F capacitor in series is connected to 230 V ac supply of angular frequency 100 rad s The impedance of the circuit is a 10 c 10 2 b 10 2 d 10
Physics
AC Circuits
37 A circuit containing a 2022 resistor and 0 1 F capacitor in series is connected to 230 V ac supply of angular frequency 100 rad s The impedance of the circuit is a 10 c 10 2 b 10 2 d 10
a 7 0 2 b 8 92 c 9 92 d 10 02 7 A pure resistive circuit element X when connected to an ac supply of peak voltage 200 V gives a peak current of 5 A which is in phase with the voltage 54 A second circuit element Y when connected to the same ac supply also gives the same value of peak current but the current lags behind by 90 If the series combination of X and Y is connected to the same supply what will be the rms value of current a 2 10 Sa A b A A C A d 5 A 8 An LCR series ac circuit is at resonance with 10 V 55 56
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AC Circuits
a 7 0 2 b 8 92 c 9 92 d 10 02 7 A pure resistive circuit element X when connected to an ac supply of peak voltage 200 V gives a peak current of 5 A which is in phase with the voltage 54 A second circuit element Y when connected to the same ac supply also gives the same value of peak current but the current lags behind by 90 If the series combination of X and Y is connected to the same supply what will be the rms value of current a 2 10 Sa A b A A C A d 5 A 8 An LCR series ac circuit is at resonance with 10 V 55 56
PPLIED TO A SERIES LCR CIRCUIT 35 In the circuit shown in figure what will be the reading of the voltmeter 100V 100 V rom I 200 V 100 Hz a 300 V c 200 V 36 In the series LCR circuit HH b 900 V d 400 V
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AC Circuits
PPLIED TO A SERIES LCR CIRCUIT 35 In the circuit shown in figure what will be the reading of the voltmeter 100V 100 V rom I 200 V 100 Hz a 300 V c 200 V 36 In the series LCR circuit HH b 900 V d 400 V
27 A coil of inductance 1 H and negligible resistance is connected to a source of supply whose voltage is given by V 4 Volt If the voltage is applied at t 0 find the energy stored in the coil in 4 s a 512 J c 1024 J b 256 J play zigme d 144 J
Physics
AC Circuits
27 A coil of inductance 1 H and negligible resistance is connected to a source of supply whose voltage is given by V 4 Volt If the voltage is applied at t 0 find the energy stored in the coil in 4 s a 512 J c 1024 J b 256 J play zigme d 144 J
9 In a series LCR circuit the voltage across an inductor capacitor and resistor are 20 V 20 V and 40 V respectively The phase difference between the applied voltage and the current in the circuit is a 30 b 45 c 60 d 0 1 When an ac source of voltage V V sin 100 is
Physics
AC Circuits
9 In a series LCR circuit the voltage across an inductor capacitor and resistor are 20 V 20 V and 40 V respectively The phase difference between the applied voltage and the current in the circuit is a 30 b 45 c 60 d 0 1 When an ac source of voltage V V sin 100 is
In an L C circuit oscillations of energy E is sustained The capacitor plates are now slowly drawn apart to increase the oscillation frequency three times The work done in the process is nE Find n
Physics
AC Circuits
In an L C circuit oscillations of energy E is sustained The capacitor plates are now slowly drawn apart to increase the oscillation frequency three times The work done in the process is nE Find n
c 1 294 27 Phase difference between voltage and current in a capacitor in an ac circuit is b x 2 a d 1 3 alternating current circuit consisting of c 0 a c 36 In
Physics
AC Circuits
c 1 294 27 Phase difference between voltage and current in a capacitor in an ac circuit is b x 2 a d 1 3 alternating current circuit consisting of c 0 a c 36 In
Ercuit 19 An ideal inductor is in turn put across 220 V 50 Hz and 220 V 100 Hz supplies The current flowing through it in the two cases will be a equal b different c zero incor d infinite 20 An inductor of 30 mH is connected to a 220 V ac source The induct
Physics
AC Circuits
Ercuit 19 An ideal inductor is in turn put across 220 V 50 Hz and 220 V 100 Hz supplies The current flowing through it in the two cases will be a equal b different c zero incor d infinite 20 An inductor of 30 mH is connected to a 220 V ac source The induct
halved d zero 4 Which of the following graphs represents the correct variation of capacitive reactance X with frequencyu Xc a c xc U b d h U U a b c d 34 An V thr of t the a c
Physics
AC Circuits
halved d zero 4 Which of the following graphs represents the correct variation of capacitive reactance X with frequencyu Xc a c xc U b d h U U a b c d 34 An V thr of t the a c
c d Only inductor A 30 F capacitor is connected to a 150 V 60 Hz ac supply The rms value of current in the circuit is a 17 A b 1 7 A c 1 7 mA d 2 7 A 160uF capacitor is connected to a 110 V rms 60 Hz 38 capaci of ang the cin a 10 c 10
Physics
AC Circuits
c d Only inductor A 30 F capacitor is connected to a 150 V 60 Hz ac supply The rms value of current in the circuit is a 17 A b 1 7 A c 1 7 mA d 2 7 A 160uF capacitor is connected to a 110 V rms 60 Hz 38 capaci of ang the cin a 10 c 10
supply The rms value of the current in the circuit is a 12 8 A b 13 6 A c 15 9 A d 19 5 A AC VOLTAGE APPLIED TO A CAPACITOR 23 In a pure capacitive circuit if the frequency of ac source is doubled then its capacitive reactance will be a remains same b doubled c halved d zero po 1 b c d 33 W ca a
Physics
AC Circuits
supply The rms value of the current in the circuit is a 12 8 A b 13 6 A c 15 9 A d 19 5 A AC VOLTAGE APPLIED TO A CAPACITOR 23 In a pure capacitive circuit if the frequency of ac source is doubled then its capacitive reactance will be a remains same b doubled c halved d zero po 1 b c d 33 W ca a
2 A 44 mH inductor is connected to 220 V 50 Hz ac supply The rms value of the current in the circuit is a 12 8 A b 13 6 A c 15 9 A d 19 5 A AC VOLTAGE APPLIED TO A CAPACITOR by t 2 S 32 In w pow a b
Physics
AC Circuits
2 A 44 mH inductor is connected to 220 V 50 Hz ac supply The rms value of the current in the circuit is a 12 8 A b 13 6 A c 15 9 A d 19 5 A AC VOLTAGE APPLIED TO A CAPACITOR by t 2 S 32 In w pow a b
21 Which of the following graphs represents the correct variation of inductive reactance X with frequency a c X D b d 29 200 31
Physics
AC Circuits
21 Which of the following graphs represents the correct variation of inductive reactance X with frequency a c X D b d 29 200 31
30 A 60 F capacitor is connected to a 110 V rms 60 Hz ac supply The rms value of current in the circuit is a 1 49 A c 2 49 A b 14 9 A d 24 9 A c 38 A 0 in s of th a
Physics
AC Circuits
30 A 60 F capacitor is connected to a 110 V rms 60 Hz ac supply The rms value of current in the circuit is a 1 49 A c 2 49 A b 14 9 A d 24 9 A c 38 A 0 in s of th a
vii An inductor with an inductance of 2 5H and a resistance of 802 is connected to the terminals of a battery with an EMF 6V and negligible internal resistance Find a The initial rate of increase of current in the circuit b The rate of increase of current at the instant when the current is 0 50A The current 0 25s after the circuit is closed The final steady state current c d
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AC Circuits
vii An inductor with an inductance of 2 5H and a resistance of 802 is connected to the terminals of a battery with an EMF 6V and negligible internal resistance Find a The initial rate of increase of current in the circuit b The rate of increase of current at the instant when the current is 0 50A The current 0 25s after the circuit is closed The final steady state current c d
c SH SH d 7 H 3 H 91 Two inductors of inductance Leach are connected in series with opposite magnetic fluxes The resultant inductance is Ignore mutual inductance a zero b L c 2L d 3L
Physics
AC Circuits
c SH SH d 7 H 3 H 91 Two inductors of inductance Leach are connected in series with opposite magnetic fluxes The resultant inductance is Ignore mutual inductance a zero b L c 2L d 3L
A two machine power system is shown below Transmission line xy has positive sequence impedance of z Q and zero sequence impedance of zo Q X Tel a phase to ground fault with zero fault impedance occurs at the centre of the transmission line Bus voltage at x and line current form X to F for the phase a are given by Va volts and la amperes respectively Then the impedance measured by the ground distance relay located at the terminal x of line xy will be given by
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AC Circuits
A two machine power system is shown below Transmission line xy has positive sequence impedance of z Q and zero sequence impedance of zo Q X Tel a phase to ground fault with zero fault impedance occurs at the centre of the transmission line Bus voltage at x and line current form X to F for the phase a are given by Va volts and la amperes respectively Then the impedance measured by the ground distance relay located at the terminal x of line xy will be given by
To 10 10 5 The root mean square value of voltage if an alternating safe va faxa e esinut ecosant fa voltage is given by e e sinet e cosmt is A B A B fote et e 1 2 2 e el 2 3 e ez 4 None of these e e 2 3 e e 4 er ega 2
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AC Circuits
To 10 10 5 The root mean square value of voltage if an alternating safe va faxa e esinut ecosant fa voltage is given by e e sinet e cosmt is A B A B fote et e 1 2 2 e el 2 3 e ez 4 None of these e e 2 3 e e 4 er ega 2
II Reading in V is ahead in phase with reading in 1 III Readings in A and V are always in phase Which of these statements is are correct 1 I only 2 II only 3 I and II only 4 II and III only 3 A thin semicircular conducting ring PQR of radius r is falling with its plane vertical in a horizontal magnetic field B as shown in figure The potential difference developed across the ring when its speed is v is neet prep 3 Amp Amp 4 Amp Amp 5 The key K is inserted at time t 0 The initial 1 0 and final too currents through battery are 2V 100 ww K 1 Amp Amp 2 Amp Amp 2002 EMI AC EM waves live session 29 Aug Pag Contact Number 9667591930 8527521718 The velocity of light in this medium would be 1 2 5x 10 m s 213 108 m
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AC Circuits
II Reading in V is ahead in phase with reading in 1 III Readings in A and V are always in phase Which of these statements is are correct 1 I only 2 II only 3 I and II only 4 II and III only 3 A thin semicircular conducting ring PQR of radius r is falling with its plane vertical in a horizontal magnetic field B as shown in figure The potential difference developed across the ring when its speed is v is neet prep 3 Amp Amp 4 Amp Amp 5 The key K is inserted at time t 0 The initial 1 0 and final too currents through battery are 2V 100 ww K 1 Amp Amp 2 Amp Amp 2002 EMI AC EM waves live session 29 Aug Pag Contact Number 9667591930 8527521718 The velocity of light in this medium would be 1 2 5x 10 m s 213 108 m
32 For a domestic AC supply of 220 V at 50 cycles per second the potential difference between the terminals of a two pin electric outlet in a room is given by a V t 220 2 cos 100nt b V t 220 cos 50t c V t 220 cos 100nt d V t 220 2 cos 50
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AC Circuits
32 For a domestic AC supply of 220 V at 50 cycles per second the potential difference between the terminals of a two pin electric outlet in a room is given by a V t 220 2 cos 100nt b V t 220 cos 50t c V t 220 cos 100nt d V t 220 2 cos 50
P Q R List l Qo HH Qo ww Initial charge on capacitor 0 60000000 www Initial current in inductor i List II Time constant is the time in 1 which current drops to 37 of its initial value Time constant is the time in 2 which current increases to 63 of its steady state value Time constant is the time in 3 which current increases to 37 of its steady state value
Physics
AC Circuits
P Q R List l Qo HH Qo ww Initial charge on capacitor 0 60000000 www Initial current in inductor i List II Time constant is the time in 1 which current drops to 37 of its initial value Time constant is the time in 2 which current increases to 63 of its steady state value Time constant is the time in 3 which current increases to 37 of its steady state value
An ideal battery is connected to a resistor and an ideal inductor as shown Considering stead state A EMF across inductor is equal to emf across battery B Potential difference across inductor is equal to emf across inductor in magnitude C Potential difference across resistor is equal to emf across inductor in magnitude D EMF across resistor is zero 000000
Physics
AC Circuits
An ideal battery is connected to a resistor and an ideal inductor as shown Considering stead state A EMF across inductor is equal to emf across battery B Potential difference across inductor is equal to emf across inductor in magnitude C Potential difference across resistor is equal to emf across inductor in magnitude D EMF across resistor is zero 000000
A single circuit 60 Hz transmission line is 370 km or 230 mi long The conductor s outside diameter is 0 977in And the flat horizontal spacing is 7 25 m or 23 8 ft between conductors The resistance of the conductor is 0 1603 ohm mile The load on the line is 125MW at 215kV with 1 unity power factor a Find the voltage current and power at the sending end
Physics
AC Circuits
A single circuit 60 Hz transmission line is 370 km or 230 mi long The conductor s outside diameter is 0 977in And the flat horizontal spacing is 7 25 m or 23 8 ft between conductors The resistance of the conductor is 0 1603 ohm mile The load on the line is 125MW at 215kV with 1 unity power factor a Find the voltage current and power at the sending end
In a pure capacitive circuit the current a lags behind the applied emf by angle 2 b leads the applied emf by an angle c leads the applied emf by angle 1 2 d and applied emfare in same phase
Physics
AC Circuits
In a pure capacitive circuit the current a lags behind the applied emf by angle 2 b leads the applied emf by an angle c leads the applied emf by angle 1 2 d and applied emfare in same phase
Alternating voltage is generated by rotating a coil in a normal magnetic field with 50 Hz frequency g If V 220V then the maximum flux passing rms through the coil is 1 0 99 Wb xxn 2 0 4 Wb 4 0 7 Wh
Physics
AC Circuits
Alternating voltage is generated by rotating a coil in a normal magnetic field with 50 Hz frequency g If V 220V then the maximum flux passing rms through the coil is 1 0 99 Wb xxn 2 0 4 Wb 4 0 7 Wh
An uncharged capacitor of capacitances 12 0 uF is connected to a battery of emf 6 00 V and internal resistance 1 00 through resistanceless leads At 12 0 us after the connections are made i the current in the circuit is 1 4 42 A 2 6 A ii the power spent by the battery is 1 26 4 W 2 13 2 W iii the power dissipated in heat is 1 26 4 W 2 13 2 W 3 4 87 W iv the rate at which energy stored in the capacitor is increasing is 1 26 4 W 2 13 2 W 3 4 87 W 3 2 21 A 3 4 87 W 4 0 A 4 0 4 0 4 8 37 W
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AC Circuits
An uncharged capacitor of capacitances 12 0 uF is connected to a battery of emf 6 00 V and internal resistance 1 00 through resistanceless leads At 12 0 us after the connections are made i the current in the circuit is 1 4 42 A 2 6 A ii the power spent by the battery is 1 26 4 W 2 13 2 W iii the power dissipated in heat is 1 26 4 W 2 13 2 W 3 4 87 W iv the rate at which energy stored in the capacitor is increasing is 1 26 4 W 2 13 2 W 3 4 87 W 3 2 21 A 3 4 87 W 4 0 A 4 0 4 0 4 8 37 W
What is the value of inductance L for which the current is a maximum in a series LCR circuit with C 10 F and 1000s 1 10 mH 2 100mH 3 1 mH
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AC Circuits
What is the value of inductance L for which the current is a maximum in a series LCR circuit with C 10 F and 1000s 1 10 mH 2 100mH 3 1 mH
V Two AC sources 1 10 sin wt V and 2 10sin wt v are fed to an LR circuit The resistance is R 100 and inductive reactance is X 10 3n The equivalent emf of the AC source has a peak value of 10 3V The peak value of current is 3 A 2 The voltage across the inductor at t The voltage across the resistor at t 3w 7T 3w IS is 15 3v 2 15 IS V R wwwww mwww LT
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AC Circuits
V Two AC sources 1 10 sin wt V and 2 10sin wt v are fed to an LR circuit The resistance is R 100 and inductive reactance is X 10 3n The equivalent emf of the AC source has a peak value of 10 3V The peak value of current is 3 A 2 The voltage across the inductor at t The voltage across the resistor at t 3w 7T 3w IS is 15 3v 2 15 IS V R wwwww mwww LT
Q 37 A coil having a resistance of 7 ohms and an inductance of 31 8 mH is connected to 230 V 50 Hz supply Calculate i the circuit current ii phase angle iii power factor iv power consumed and v voltage drop across resistor and inductor Circuit current 16 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 200V Voltage drops across L 225 V Circuit current 15 85 A Phase angle 65 Power consumed 1484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 14 85 A Phase angle 45 Power consumed 3484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 18 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V
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AC Circuits
Q 37 A coil having a resistance of 7 ohms and an inductance of 31 8 mH is connected to 230 V 50 Hz supply Calculate i the circuit current ii phase angle iii power factor iv power consumed and v voltage drop across resistor and inductor Circuit current 16 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 200V Voltage drops across L 225 V Circuit current 15 85 A Phase angle 65 Power consumed 1484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 14 85 A Phase angle 45 Power consumed 3484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 18 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V
Q 34 A coil having a resistance of 7 ohms and an inductance of 31 8 mH is connected to 230 V 50 Hz supply Calculate i the circuit current ii phase angle iii power factor iv power consumed and v voltage drop across resistor and inductor Circuit current 16 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 200V Voltage drops across L 225 V Circuit current 15 85 A Phase angle 65 Power consumed 1484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 14 85 A Phase angle 45 Power consumed 3484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 18 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V
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AC Circuits
Q 34 A coil having a resistance of 7 ohms and an inductance of 31 8 mH is connected to 230 V 50 Hz supply Calculate i the circuit current ii phase angle iii power factor iv power consumed and v voltage drop across resistor and inductor Circuit current 16 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 200V Voltage drops across L 225 V Circuit current 15 85 A Phase angle 65 Power consumed 1484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 14 85 A Phase angle 45 Power consumed 3484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V Circuit current 18 85 A Phase angle 55 Power consumed 2484 24 W Voltage drops across R 131 95V Voltage drops across L 188 5 V
When the frequency of an ac circuit is decreased the current in the circuit increases The circuit is most likely to comprise of A resistance only B capacitor only sd C resistance and inductor D resistance and capacitor
Physics
AC Circuits
When the frequency of an ac circuit is decreased the current in the circuit increases The circuit is most likely to comprise of A resistance only B capacitor only sd C resistance and inductor D resistance and capacitor
3 A particle of mass 103 kg and charge 1 0 C is initially at rest At time t 0 the particle comes under the influence of an electric field E t Eo sin wt where Eo 1 0 N C 1 and w 10 rad s 1 Consider the effect of only the electrical force on the particle Then the maximum speed in m s 1 attained by the particle at subsequent times is
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AC Circuits
3 A particle of mass 103 kg and charge 1 0 C is initially at rest At time t 0 the particle comes under the influence of an electric field E t Eo sin wt where Eo 1 0 N C 1 and w 10 rad s 1 Consider the effect of only the electrical force on the particle Then the maximum speed in m s 1 attained by the particle at subsequent times is
3 Calculate the r m s value the form factor and peak factor of a periodic voltage having the following values for equal time intervals changing suddenly from one value to the next 0 5 10 20 50 60 50 20 10 5 0 5 10 V etc What would be the r m s value of sine wave having the same peak value 60 50 20 10 5 10 20 50 60 Sine Wave
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AC Circuits
3 Calculate the r m s value the form factor and peak factor of a periodic voltage having the following values for equal time intervals changing suddenly from one value to the next 0 5 10 20 50 60 50 20 10 5 0 5 10 V etc What would be the r m s value of sine wave having the same peak value 60 50 20 10 5 10 20 50 60 Sine Wave
6 Consider the following series RLC circuit Here the symbols H L and C denote resistance inductance and capacitance respectively If frequency of the supply voltage is increased from a very low value to a very high value the maximum voltages across L and C are measured at frequencies fi and fc respectively Which of the following statements is correct a fc c fr 1 2 LC 1 and f and f 1 2 LC 1 b fo d fc 1 27 LC 1 and f and f 1 27 LC 1 G
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AC Circuits
6 Consider the following series RLC circuit Here the symbols H L and C denote resistance inductance and capacitance respectively If frequency of the supply voltage is increased from a very low value to a very high value the maximum voltages across L and C are measured at frequencies fi and fc respectively Which of the following statements is correct a fc c fr 1 2 LC 1 and f and f 1 2 LC 1 b fo d fc 1 27 LC 1 and f and f 1 27 LC 1 G
In the figure an A C of 200 rms voltage is applied to the circuit containing diode and the capacitor and it is being rectified The potential across the capacitor C in steady state will be 1 500V 2 200V 283 V 4 141V Vo 200 52 Vo 20012 200V rms
Physics
AC Circuits
In the figure an A C of 200 rms voltage is applied to the circuit containing diode and the capacitor and it is being rectified The potential across the capacitor C in steady state will be 1 500V 2 200V 283 V 4 141V Vo 200 52 Vo 20012 200V rms
In an n p n transistor 108 electrons enter the emitter in 10 8 s If 1 electrons are lost in the base the fraction of current that enters the collector and current amplification factor B are respectively Question Type Single Correct Type 1 0 8 and 49 2 0 9 and 90 3 0 7 and 50
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AC Circuits
In an n p n transistor 108 electrons enter the emitter in 10 8 s If 1 electrons are lost in the base the fraction of current that enters the collector and current amplification factor B are respectively Question Type Single Correct Type 1 0 8 and 49 2 0 9 and 90 3 0 7 and 50
If V 100sin 100t V and I 100sin 100t mA 3 are the instantaneous values of voltage and current then the rms values of voltage and current ar respectively a 70 7 V 70 7 mA b 70 7 V 70 7 A c 141 4 V 141 4 mA d 100 V 100 mA
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AC Circuits
If V 100sin 100t V and I 100sin 100t mA 3 are the instantaneous values of voltage and current then the rms values of voltage and current ar respectively a 70 7 V 70 7 mA b 70 7 V 70 7 A c 141 4 V 141 4 mA d 100 V 100 mA
The circuit shown in the figure has two sources connected in series The instantaneous voltage of the AC source in volts is given by v t 12 sin t If the circuit is in steady state then the rms value of the current in Ampere flowing in the circuit is v t 8 V 19 ww testbod 1H
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AC Circuits
The circuit shown in the figure has two sources connected in series The instantaneous voltage of the AC source in volts is given by v t 12 sin t If the circuit is in steady state then the rms value of the current in Ampere flowing in the circuit is v t 8 V 19 ww testbod 1H
In the figure shown V V V3 are AC voltmeters and A is AC ammeter The readings of V V V3 and A are 10 V 20 V 20 V 2 A respectively If the inductor is short circuited then the readings of v is m 5 volts Find m wir A V v 50Hz roro V3
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AC Circuits
In the figure shown V V V3 are AC voltmeters and A is AC ammeter The readings of V V V3 and A are 10 V 20 V 20 V 2 A respectively If the inductor is short circuited then the readings of v is m 5 volts Find m wir A V v 50Hz roro V3
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns giving the output power at 230 V If the current in the primary of the transformer is 5 A and its efficiency is 90 the output current would be A B 50 A 45 A X
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AC Circuits
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns giving the output power at 230 V If the current in the primary of the transformer is 5 A and its efficiency is 90 the output current would be A B 50 A 45 A X
A series combination of an inductor L capacitor C and a resistor R is connected across an ac source of emf of peak value Eo and angular frequency w Plot a graph to show variation of impedance of the circuit with angular frequency w A square shaped current carrying loop MNOP is placed near a straight long current La com plane If the
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AC Circuits
A series combination of an inductor L capacitor C and a resistor R is connected across an ac source of emf of peak value Eo and angular frequency w Plot a graph to show variation of impedance of the circuit with angular frequency w A square shaped current carrying loop MNOP is placed near a straight long current La com plane If the
The figure shows two sinusoidal curves representing oscillating supply voltage and current in an ac circuit O it T 4 E t Draw a phasor diagram to represent the current and supply voltage appropriately as phasors State the phase difference between the two quantities
Physics
AC Circuits
The figure shows two sinusoidal curves representing oscillating supply voltage and current in an ac circuit O it T 4 E t Draw a phasor diagram to represent the current and supply voltage appropriately as phasors State the phase difference between the two quantities
by a AC source generating a square wave The output wave pattern monitored by CRO would look close to 1 2 R M CRO
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AC Circuits
by a AC source generating a square wave The output wave pattern monitored by CRO would look close to 1 2 R M CRO
passing through fine slits 14 Assertion Transformers are used only in alternating current source not in direct current Reason Only a c can be stepped up or down by means of transformers
Physics
AC Circuits
passing through fine slits 14 Assertion Transformers are used only in alternating current source not in direct current Reason Only a c can be stepped up or down by means of transformers
F r given RC circuit Select the correct options Assume capacitor initially uncharged Maximum charge on capacitor is CE Current through resistor is E C Charge on capacitor at time t is CE 1 e RC Time constant of circuit is RC R at t 0 E
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AC Circuits
F r given RC circuit Select the correct options Assume capacitor initially uncharged Maximum charge on capacitor is CE Current through resistor is E C Charge on capacitor at time t is CE 1 e RC Time constant of circuit is RC R at t 0 E