The core of any transformer is laminated so as to

An inductance L having a resistance R is connected to an alternating source of angular frequency ω The Quality factor Q of inductance is

In an experiment, 200 V A.C. is applied at the ends of an LCR circuit. The circuit consists of an inductive reactance(X_L) = 50 Ω, capacitive reactance (X_C) = 50 Ω and ohmic resistance (R) = 10 Ω. The impedance of the circuit is

A step-up transformer has transformation ratio of 3 : 2. What is the voltage in secondary, if voltage in primary is 30 V?

A transformer has an efficiency of 80%. It works at 4 kW and 100 V. If secondary voltage is 240 V,the current in primary coil is

An alternating voltage of 220 V, 50Hz frequency is applied across a capacitor of capacitance 2 µF.The impedence of the circuit is

In a pure capacitive A.C. circuit current and voltage differ in phase by

A.C. power is transmitted from a power house at a high voltage as

The power factor of an AC circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω is

In series combination of R, L and C with an A.C. source at resonance, if R = 20 ohm, then impedence Z of the combination is

Which of the following will have the dimensions of time