Chapter 27 – Alternating Current
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A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are
19
Aug
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are A transformer having efficiency of 90% is working on 200 V and 3 kW [...]
An inductor 20 mH, a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is
19
Aug
An inductor 20 mH, a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf, V = 10 sin 314 t. The power loss in the circuit is a capacitor 100 μF and a resistor 50Ω are connected in series across a source of emf An inductor 20 mH [...]
In an AC circuit the emf (V) and the current (i) at any instant are given respectively by V= V0 sin ωt i=i0 sin (ωt−ϕ) The average power in the circuit over one cycle of AC is
19
Aug
In an AC circuit the emf (V) and the current (i) at any instant are given respectively by V= V0 sin ωt i=i0 sin (ωt−ϕ) The average power in the circuit over one cycle of AC is In an AC circuit the emf (V) and the current (i) at any instant are given respectively by [...]
Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is
19
Aug
Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is Power dissipated in an L-C-R series circuit connected to an AC source of emf ε is August 19, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions [...]
In an electrical circuit, R, L, C and ac voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is
19
Aug
In an electrical circuit, R, L, C and ac voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit, the phase difference is again π/3. The power factor of [...]
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C and ac voltage source are all connected in series. When L is removed from the circuit ,
In an electrical circuit ,
L ,
R ,
the phase difference between the voltage and the current in the circuit is π/3. If instead C is removed from the circuit ,
the phase difference is again π/3. The power factor of the circuit is ,
The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ?
19
Aug
The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ? The variation of EMF with time for four types of generators are shown in the figures. Which amongst them can be called AC ? August 19, 2020 Category: Chapter 27 - [...]
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is:
19
Aug
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is: 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is: capacitance and inductance are 80 V The potential differences [...]
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is:
19
Aug
The condition under which a microwave oven heats up a food item containing water molecules most efficiently is: The condition under which a microwave oven heats up a food item containing water molecules most efficiently is: August 19, 2020 Category: Chapter 27 - Alternating Current , NEET Last 32 Years Solved 1988 - 2019 Physics [...]
In a circuit, L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45 degree. The value of C is
19
Aug
In a circuit, L, C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45 degree. The value of C is C and R are connected in series with an alternating voltage source of frequency f. The current leads the voltage by 45 degree. [...]
A coil of inductive reactance 31 ohm has a resistance of 8 ohm. It is placed in series with a condenser of capacitative reactance 25 ohm. The combination is connected to an AC source of 110V. The power factor of the circuit is
19
Aug
A coil of inductive reactance 31 ohm has a resistance of 8 ohm. It is placed in series with a condenser of capacitative reactance 25 ohm. The combination is connected to an AC source of 110V. The power factor of the circuit is What is the value of inductance L for which the current is [...]