Transformer is used to
Transformer is used to
Options
(a) convert AC to DC voltage (b) convert DC to AC voltage (c) obtain desired DC power (d) obtain desired AC voltage and current
Correct Answer:
obtain desired […]
Alternating Current
The average power dissipated in a pure inductor is
The average power dissipated in a pure inductor is
Options
(a) VI²/4 (b) 1/2 VI (c) zero (d) VI²
Correct Answer:
zero
Explanation:
In the inductor circuit, phase difference (ɸ) = 90° or π […]
In a circuit, L,C and R are connected in series with an alternating voltage source
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 45⁰. The value of C is
Options
(a) 1/πf(2πfL+R) (b) […]
In an L-C-R series resonant circuit, the capacitance is changed from C to 4C.
In an L-C-R series resonant circuit, the capacitance is changed from C to 4C. For the same resonant frequency, the inductance should be changed from L to
Options
(a) 2L (b) L/2 (c) 4L […]
The electric current in AC circuit is given by the relation i-3 sinωt+4 cos ωt.
The electric current in AC circuit is given by the relation i-3 sinωt+4 cosωt. The rms value of the current in the circuit in ampere is
Options
(a) 5/√2 (b) 5√2 (c) √2/5 (d) […]
In a circuit, the current lags behind the voltage by a phase difference of π/2.
In a circuit, the current lags behind the voltage by a phase difference of π/2. The circuit contains which of the following?
Options
(a) Only L (b) Only C (c) Only R (d) […]
An inductor coil is connected to a 12 V battery and drawing a current 24 A. This coil
An inductor coil is connected to a 12 V battery and drawing a current 24 A. This coil is connected to capacitor and an AC source of rms voltage rating 24 V in the series […]
An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor
An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor of 1 μF. The current reading of the ammeter will be equal to …….. mA
Options
(a) 20 (b) 10 (c) […]
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series across a source of emf V=10 sin340t. The power loss in AC circuit is
Options
(a) 0.67 […]
A small signal voltage V(t)=V₀ sin ωt is applied across an ideal capacitor C
A small signal voltage V(t)=V₀ sin ωt is applied across an ideal capacitor C
Options
(a) over a full cycle the capacitor C does not consume any energy from the voltage source (b) […]