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Power Electroni...

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  • Question 1
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    A single-phase half bridge inverter has supply voltage of 200 V. For a load resistance of 10 Ω, the output power is equal to

  • Question 2
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    The single-phase half-bridge inverter has a resistive load of 10Ω and the centre-tap dc input voltage is 96 V. The fundamental power consumed by the load is

  • Question 3
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    A single-phase half-bridge inverter has a resistive load of R = 3 Ω and the dc input voltage Vdc = 24 volts. The harmonic factor of the lowest order harmonic would be equal to

  • Question 4
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    A single-phase transistorized bridge inverter has a resistive load of R = 3 Ω and the dc input voltage of 48 volts. The total harmonic distortion is approximately equal to

  • Question 5
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    A DC-DC converter operates in conduction mode. It has a 36 V input voltage and it feeds a resistive load of 18 Ω. The switching frequency of the converter is 200 Hz. If the switch-on duration is 1.25 ms, which of the following is/are true?

  • Question 6
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    The output voltage of a single-phase full-bridge voltage source inverter is controlled by unipolar PWM with one pulse per half cycle. The input voltage of the inverter is 100 V. For the fundamental RMS component of the output voltage to be 70% of DC voltage, which of the following is/are true?

  • Question 7
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    A three-phase full-wave half-controlled converter supplies a highly inductive load with R = 10 Ω the supply is a three-phase star connected with 400 V RMS. The value of firing angle in degrees, to obtain the dc output current as 15 A is _______

  • Question 8
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    A single-phase half wave controlled rectifier supplied from 230 V a.c. supply is operating at α = 60°. If the load resistor is 10 Ω, the power factor at the ac source is _______

  • Question 9
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    A full-bridge bipolar PWM inverter is fed from a 240 V battery and is driving an RL load. The fundamental output voltage for a modulation index of 0.8 is

  • Question 10
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    A current source inverter can be

  • Question 11
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    A step-down chopper has input voltage 200 V and o/p voltage 140 V. If the conduction time of thyristor chopper is 70 μ sec. Now if the frequency operation is increased by 25% keeping conduction time of thyristor constant than find the average value of new output voltage.

  • Question 12
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    A 3-ϕ 180° mode bridge inverter has star connected load of R = 4 Ω and L = 25 mH. The inverter is feed from 220 V dc and its output frequency is 50 Hz. Find the fundamental component of line voltage.

  • Question 13
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    AN SCR requires 50 mA gate current to switch it ON. The driver circuit supply voltage is 10 V. The gate-cathode drop is about 1 V and the voltage drop across diode is also 1 V. The resistive load supplied from a 100 V supply is

  • Question 14
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    A class – A chopper circuit is supplied DC source voltage 100 V. The chopper supplies power to a series R-L load with R = 0.5 Ω and L = 1 mH. The chopper switch is ON for 1 ms in an overall period of 3 ms. The minimum value of load current is ______ (in A). Assume continuous current operation of the chopper.

  • Question 15
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    The series-inverter control method is an-

  • Question 16
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    A 200 V DC voltage is supplying power to an RCL load through a single-phase full bridge through a

    R = 10 Ω, L = 60 mH, C = 100 μF.

    If the output frequency is 50 Hz, The maximum thyristor current is

  • Question 17
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    A single phase IGBT bridge inverter, compared to a single pulse PWM control, multiple pulse PWM

  • Question 18
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    In a single-pulse modulation of PWM inverters if pulse width is 120° then

  • Question 19
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    A single phase inverter as shown in figure below

    Which of the current wave form is true

  • Question 20
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    A single-phase midpoint converter supplied from 240/120 V, 50 Hz transformer is connected to a load of 15 Ω resistance and infinite inductance. If the secondary winding of the transformer has a line inductance of 20 mH, which of the following is/are true for a firing angle of 60°?

  • Question 21
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    A single-phase full bridge inverter can operate in load-commutation mode in case load consists of

  • Question 22
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    An inverter has a periodic output voltage with the output waveform as shown in figure.

    When the conduction angle a = 120°, the rms value of the output voltage is

  • Question 23
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    A thyristor controlled induction motor working at a slip of 0.02 fed from voltage controlled source inverter as shown

    Operated at 50 Hz, 6 pole machine. The speed of rotor will be

  • Question 24
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    A three phase 120 degree mode voltage source inverter connected to a resistive inductive load, R = 10 W, L = 200 mH. What will be the load power if inverter source voltage is 100 V dc.

  • Question 25
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    A dc chopper has a T0N of 1 ms and its frequency is 500 Hz. What will be its duty cycle?

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