List of top Electrical Circuits and Machines Questions asked in GATE IN

In the circuit shown, the load is driven by a sinusoidal ac voltage source \( V_1 = 100 \angle 0^\circ \, \text{V} \) at 50 Hz. Given \( R_1 = 20 \, \Omega \), \( C_1 = \left(\frac{1000}{\pi}\right) \, \mu\text{F} \), \( L_1 = \left(\frac{20}{\pi}\right) \, \text{mH} \), and \( R_2 = 4 \, \Omega \), the power factor is _________ (round off to one decimal place)

Given Circuit A with currents \(I_1\) and \(I_2\) as shown, the current \(I_3\) in Circuit B (in amperes) is _________ (round off to one decimal place).

In the balanced three-phase circuit shown, \( C_0 = 8.2 \, \mu F \) and the line-to-line r.m.s. voltage is 440 V at 50 Hz. The reading on the wattmeter (in watts) is _________.

A 440 V, 8 kW, 4-pole, 50 Hz, star-connected induction motor has a full load slip of 0.04. The rotor speed (in rpm) at full load is _________.

An air-cored coil having a winding resistance of 10 \(\Omega\) is connected in series with a variable capacitor \( C_x \). The series circuit is excited by a 10 V sinusoidal voltage source of angular frequency 1000 rad/s. As the value of the capacitor is varied, a maximum voltage of 30 V was observed across it. Neglecting skin effect, the value of the inductance of the coil in millihenry is \(\underline{\hspace{2cm}}\).

A household fan consumes 60 W and draws a current of 0.3125 A (rms) when connected to a 230 V (rms) ac, 50 Hz single-phase mains. The reactive power drawn by the fan in VAr is \(\underline{\hspace{2cm}}\) (rounded off to the nearest integer).

A slip-ring induction motor is expected to be started by adding extra resistance in the rotor circuit. The benefit that is derived by adding extra resistance in the rotor circuit in comparison to the rotor being shorted is

A single-phase transformer has a magnetizing inductance of 250 mH and a core loss resistance of 300 \(\Omega\), referred to primary side. When excited with a 230 V, 50 Hz sinusoidal supply at the primary, the power factor of the input current drawn, with secondary on open circuit, is \(\underline{\hspace{2cm}}\) (rounded off to two decimal places).

A 50 KVA 1- phase transformer has a full load efficiency of 95% at unity power factor and core loss is a 0 Watt. find the efficiency at 75% of full load and 0.8 power factor lag

if current passing through g is 0, then find \(R_X\)

Consider a unity bad back system with open loop Pole zero location given in circuit. it's R.L Cut the imaginary axis at \(s=jα (α>0)\)what is the value of \(α\).

Find dV/dt

Two Inductors are connected in series adding condition resultant is 500 MH & series opposition is 300 MH. Both inductors are equal then find coefficient of coupling?

A 3- phase squirrel cage induction motor has a starting torque of 100% of full load torque and maximum torque of 300% of full load for torque neglect stator impedances the slip at maximum torque is _____%