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QUESTION: 1

A single-phase voltage source square-wave inverter feeds pure inductive load. The waveform of the load current will be

Solution:

A single-phase voltage source square-wave inverter feeds pure inductive load. The waveform of the load current will be triangular.

*Answer can only contain numeric values

QUESTION: 2

The output value e_{1} and e_{2} of two full bridge inverter are added using output transformer. In order to eliminate the 3^{rd} harmonic from output voltage, the phase angle between e_{1} and e_{2} should be ______ degree.

Solution:

It is possible when

3θ = π

θ = π/3

QUESTION: 3

A single phase full bridge inverter is fed from a 48 V battery and is delivering power to a pure resistance load what is the value of fundaments output voltage?

Solution:

__Concept:__

For single phase full bridge inverter

__Calculation:__

The RMS value of the fundamental voltage

*Answer can only contain numeric values

QUESTION: 4

A single phase full-bridge inverter, connected to 230 V dc source, feeds a resistive load 20 Ω find the average current of each SCR.

Solution:

__Concept:__

In full-bridge inverter SCR conducts for 180° during one cycle of 360°

Average SCR current =

and peak current of each thyristor =

__Calculation:__

I_{TP} = 230/20 = 11.5A

∴ Average current of each SCR =

QUESTION: 5

A single phase full bridge inverter feeds power to a load of R = 12 Ω and L = 0.04 H from a 400 V dc source. If the inverter operates the frequency of 50 Hz, determine the power delivered to load (in watt) for square wave operation. (Consider first and third harmonic).

Solution:

RMS value of fundamental voltage is

Load impedance at fundamental frequency

RMS value of resultant.

*Answer can only contain numeric values

QUESTION: 6

A single phase full converter, connected 240 V, 50 Hz source, is feeding a load R = 10 Ω in series with a larger inductance that makes the load current ripple free. For a firing angle 30°, calculated R.M.S value of fundamental current (in A).

Solution:

The R.M.S value of n^{th} harmonic input current

R.M.S value of fundamental current

*Answer can only contain numeric values

QUESTION: 7

A single phase half bridge inverter is feeding power into a load of resistance 20 Ω, dc input to the inverter is 500V. Then the power factor is_____

Solution:

RMS value of output voltage is,

RMS value of load current is,

Power delivered,

Power factor, cosϕ = P/VI = 0.99

QUESTION: 8

A single phase half bridge VSI has load R = 1.8 Ω and DC source voltage 130 – 0 – 130 V. Find the power delivered to the load due to fundamental current.

Solution:

V_{dc} = 260 V

P_{01} = (65.023)^{2 }(1.8)

= 7610.38 W

= 7.61 kW

*Answer can only contain numeric values

QUESTION: 9

A single phase full converter feeds power to RLE load. If one of the four SCR gets open circuited due to fault. Find the value of average load current (in A) for firing angle 40°.

Solution:

QUESTION: 10

A single phase half-bridge inverter, connected to 230 V dc source, feeds a resistive load of 15 Ω.

The Input power factor is

Solution:

Inputpowerfactor =

Fourier series of output voltage

RMS value of fundamental voltage

R.M.S value of fundamental current

Total R.M.S output voltage =

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