Physics question and answers for November 17, 2023
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q 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...
- Q by a AC source generating a square wave The output wave pattern monitored by CRO would look close to 1 2 R M CRO
- Q 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...
- Q 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...
- Q lllllllll An inductor has an inductance 25 mH 8 of these identical inductors are then connected in series This network of inductors is then connected to a 6 0 V...
- Q In an L C circuit shown in the figure C 1F L 4H At time t 4H At time t 0 charge in the capacitor is 4 Coulombs and it...
- Q A constant electromotive force E volt is applied to circuit containing a constant resistance ohm in series with a constant inductance L henries If the initial current is zero What...
- Q Example A 50 kVA distribution transformer has iron loss of 600W and full load copper loss of 700W the transformer is supplying load The load cycle is as under 35HW...
- Q A 12 ohm resistor and a 0 21 henry inductor are connected in series to an AC source operating at 20 volts 50 cycle second The phase angle between the...
- Q Q40 As shown in figure a battery of emfs is connected to an inductor and resistance R in series The switch is closed at t 0 The total charge that...
- Q A 3 phase 100 MVA 10 kV alternator has 5 reactance An external reactance Xseries per phase has to be connected in series with the alternator so that three phase...
- Q An inductive circuit contains resistance of 10 oh and an inductance of 20 H If an A C voltage 120 volt and frequency 60 Hz is applied to circuit the...
- Q A circular loop of radius r is made of a wire of circular cross section of diameter a When current I flows through the loop the magnetic flux linked with...
- Q Two resistors are connected a in series b in parallel The equivalent resistance in the two cases is 9 ohm and 2 ohms respectively Then the resistances of the component...
- Q Part a of the drawing shows a resistor and a charged capacitor wired in series When the switch is closed the capacitor discharges as charge moves from one plate to...
- Q No 37 View In English A capacitor of capacitance C has initial charge Og and connected to inductor L as shown at t 0 switch S is pressed The current...
- Q A circuit containing an inductance and a resistance connected in series has an AC source of 200 V 50 Hz connected across it An AC current of 10 A ms...
- Q What is the resonant frequency for the circuit below assuming that the RMS value of Vs 100 V the operating frequency is 169 kHz C R w HH 470 2...
- Q 0 Energy in a typical inductor a How much energy is stored in a 9 20 mH inductor carrying a 1 25 A current b How much current would such...
- Q Consider a stator winding of an alternator with an internal high resistance ground fault The currents under the fault condition are as shown in the figure The winding is protected...
- Q of the voltmeter ww 1 300 V 2 900 3 200 4 400 V 1 0V 34 2 1501 34 3 1501 64 4 0V 84 10 In the circuit...
- Q 1 An ac source of angular frequency is fed across a resistor r and a capacitor C in series The current registered is 1 If now the frequency of the...
- Q In the equivalent circuit of three phase induction motor the mechanical loa the motor can be represented by a resistance of value R2 rotor resistance s slip OR2 1 s...
- Q any energy from the voltage source 2 current I t is in phase with voltage V t neet prep inductor of reactance 311 The impendance of the is z Now...
- Q Example 14 4 The V I characteristic of a silicon diode is shown in the Fig 14 17 Calculate the resistance of the diode at a I 15 mA and...
- Q In an L R circuit AC source of frequency 50 Hz is connected as shown in the figure The phase difference between voltage and current is 1 90 3 45...
- Q 72 A capacitor stores 60 C charge when connected across a battery When the gap between the plates is filled with a dielectric a charge of 120 c flows through...
- Q In the circuit shown resistance 10032 2 inductance L H and capacitance 3 C F are connected in series with an ac source of 200 volt and frequency f If...
- Q 1 2 3 positive negative and zero sequence impedances are equal positive and negative sequence impedances are equal zero and positive sequence impedances are equal negative and zero sequence
- Q A surge of 100 kV travels along an overhead line towards its junction with a cable The surge impedance for the overhead line and cable are 4000 and 50 respectively...
- Q R 100 C L 100 100 T F L mH are connected to an ac and T source as shown in the figure The rms value of ac calue is...
- Q resistance is connected to an A C source of 200 V and angular frequency 300rads When only the capacitor is removed the current lags behind the voltage by 600 When...
- Q When an ac source of voltage V Vo sin100t is connected across a circuit the phase difference between the voltage V and current I in the circuit is observed to...
- Q b In the R L circuit shown in the below figure the resistance R 30 ohm and reactance X 40 ohm and peak e m f V 220 V Calculate...
- Q An AC source of emf 5 0 V is connected to a series RLC circuit at a phase angle of 33 Find the potential difference across the capacitor when the...
- Q In order to avoid eddy currents in the core of a transformer O The number of turns in the secondary coil is made considerably large OA laminated core is used...
- Q An AC source rated 220 V 50 Hz is connected to a resistor The time taken by the current to change from its maximum to the rms value is mathongo...
- Q The series combination of resistance R and inductance L is connected to an alternating source of emf e 311 sin 100 t If the value of wattless current is 0...
- Q In a series LCR circuit the inductive reactance X is 1002 and the capacitive reactance Xc is 42 The resistance R in the circuit is 652 The power factor of...
- Q A sinusoidal voltage of peak value 250 V is applied to a series LCR circuit in which R 80 L 24mH and C 60 F The value of power dissipated...
- Q The variation of EMF with time for four types of generators are shown in the figures Which amongst them can be called AC NEET 2019 Odisha EA a c EA...
- Q A generator with constant 1 0 p u terminal voltage supplies power through a step up transformer of 0 12 p u reactance and a double circuit line to an...
- Q For a power system the admittance and impedance matrices for the fault studies are as follows Ybus j8 75 j1 25 j2 50 j1 25 j6 25 j2 50 j2...
- Q consider two buses connected by an impedance of 0 5j The bus 1 voltage is 100 230 V and bus 2 voltage is 100 20 V The real and reactive...
- Q An RLC series circuit is driven by a sinusoidal emf with angular frequency o If is increased without changing the amplitude of the emf the current amplitude increases It means...
- Q A 2 bus system and corresponding zero sequence network are shown in the figure Bus 1 T Bus 2 XGn 3X Gr XOG T leeee XOT1 leeee XOL a XOT2...
- Q An ideal choke takes a current of 8A when connected to an a c source of 100 volt and 50 Hz A pure resistor under the same conditions takes a...
- Q Consider the LR circuit shown in the figure If the switch S is closed at t 0 then the amount of charge that passes through the battery between t 0...
- Q In a series sinusoidally driven LCR AC circuit the current lags the applied emf The rate at which energy is dissipated in the resistor can be increased by 1 Decreasing...
- Q In the circuit shown the switch 1 is closed first and then switch 2 is closed The amount of heat developed in resistance R will be 1 R wwww LE...
- Q instant comes out volt value of N is N 3 s 1 A and peak value of current is 3 potential difference between P and Q at the same P...
- Q The net resistance of a voltmeter should be large to ensure that a It does not get overheated b It does not draw excessive current c It can measure large...
- Q a Draw graphs showing the variations of inductive reactance and capacitive reactance with frequency of the applied ac source b Draw the phasor diagram for a series RC circuit connected...
- Q 30 An LC circuit contains a 20 mH inductor and a 50 F capacitor with an initial charge of 10 mC The resistance of the circuit is negligible Let the...
- Q Two identical unloaded generators are connected in parallel as shown in the figure Both the generators are having positive negative and zero sequence impedances of j0 4 p u j0...
- Q The RL circuit of the figure is fed from a constant magnitude variable frequency sinusoidal voltage source Vin At 100 Hz the R and L elements each have a voltage...
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