GATE 2022 : Power Electronics Quiz 6

A single quadrant chopper is feeding a separately excited DC motor from 400V DC. If the motor constant is 1V-sec/rad, armature resistance 2Ω and duty ratio of 0.6 then the speed of motor at 5 Nm torque is:

In the below figure shows a chopper operating from 150 V DC input the duty ratio of switch is 0.4. The average output voltage of the chopper will be

A Boost converter is shown in the following circuit.

If V_dc = 20 V, V₀ = 50 V, R = 50 Ω, L = 20 μH and ∝ = 0.5

Then the converter will operate at a switching frequency (in kHz)

In the following circuit the ideal switch S is operating at 10 KHz. The circuit is operated in steady state at the boundary of the continuous and discontinuous, the critical resistance is.

In the following circuit, MOSFET Q is switched at 100 KHz with a duty ratio of 0.5 . MOSFET is having an ON resistance of 20Ω when it is ON (Consider the case of boundary of continuous and discontinuous condition).

The average conduction Loss in MOSFET is.

A voltage commutated chopper is gives below. The chopper duty ratio is 50%. The load current remains contact 10 A assuming the input voltage to be 190 V and device to be ideal. Maximum value of current through capacitor is