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Power Electroni...

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  • Question 1
    2 / -0.33

    Due to low internal generation in GTO, the GTO has

  • Question 2
    2 / -0.33

    The reverse recovery time of a diode is trr = 3 μs and the rate of fall is \(\frac{{di}}{{dt}} = 30\;A/\mu s\). The stored charge of the diode is

  • Question 3
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    A star-connected load of 20 Ω per phase is Fed from 450 V source through a 3-phase bridge inverter. For 180° mode determine load power in kW is ______ (correct up to 2 decimal places)

  • Question 4
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    A star connected load of 15 Ω per phase is fed from 420 V DC source through a 3-phase bridge inverter. If the inverter is operating in 120° conduction mode, the RMS value of thyristor current is _________ (in A)

  • Question 5
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    An IGBT chopper modulated power from a 200 V DC supply to a resistive load of 20 Ω. The switching frequency of the choppers is 1 kHz for VDS(sat) = 1.9 V. The chopper has a duty cycle, m = 0.8. The average power loss due to conduction is _______ (in W)

  • Question 6
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    A 1000 V 25 A GTO controls power from a DC supply of 600 V to Rload of 30 Ω. The data sheet gives the following information: the on-state voltage drop, VGTO(ON) = 2.2 V; average gate power should not exceed 10 W; IG Turn-off = -25 A.

  • Question 7
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    A single-phase AC supply is connected to a full wave rectifier through a transformer. The rectifier is required to supply an average DC output voltage of Vdc = 400 V to a resistive load of R = 10 Ω. The kVA rating of the transformer is __________ (in kVA)

  • Question 8
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    A single-phase semi-converter, connected to 230 V 50 Hz source, is feeding a load R = 10 Ω in series with a large inductance that makes the load ripple-free. The firing angle is 30o, then the current distortion factor is_________

  • Question 9
    2 / -0.33

    A three-phase three pulse converter, fed from three-phase 400 V, 50Hz supply, has a load R = 2 Ω, E = 200 V, and large inductance so that load current is constant at 20A. If the source has an inductance of 2 mH, then the value of overlap angle for inverter operation is 

  • Question 10
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    A single-phase full-bridge inverter has RLC load of R = 4Ω, L = 35 mH, C = 155 μF. The DC input voltage is 230 V and the output frequency is 50 Hz. The third harmonic component in load current is:

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