Get Advice on Live Video Call
Earn $ Cash $ with
consultations on Bissoy App

If Vr is the rms value of the inverter output voltage and V1 is the rms value of the fundamental component, then the total harmonic distortion (THD) is given by 1/2 d) 2

A

Vr/V1

B

(Vr + V1)/Vr

C

[ (Vr/V1)2 – 1

D

(Vr/V1)2 – 1

Correct Answer: [ (Vr/V1)2 – 1

THD is the ratio of rms value of all the harmonic components to the rms value of the fundamental component. Rms value of all the harmonic components VH = (Vr2 – V12)1/2 THD = (Vr2 – V12)1/2/ V1.

A single phase inverter gives rms value of output voltage as 115 V and the fundamental output voltage of as 103.5 V. Find the THD (Total Harmonic Distortion).

A

0.4 %

B

40.8 %

C

48.3 %

D

4.83 %

What is the total harmonic distortion if the amplitude of first harmonic distortion is 20dB and second harmonic distortion 25dB?

A

1.2

B

1.52

C

1.25

D

1.5

What is the total harmonic distortion if the amplitude of first harmonic distortion is 20dB, second harmonic distortion 25dB and external noise is 10dB?

A

11.2dB

B

11.52dB

C

11.25dB

D

11.5dB

A single-phase bridge inverter, fed from a 230 V dc is connected to the load R = 10 Ω and L = 0.03 H. Determine the fundamental component of rms output current. Fundamental output frequency of the square wave output = 50 Hz.

A

30 A

B

15 A

C

2.3 A

D

20.7 A

A certain full bridge type inverter circuit has its rms value of fundamental load current component given by W. The fundamental frequency component of the load current would be given by

A

W sin ωt

B

(W/√2) sin ωt

C

√2 W sin ωt

D

sin ωt

A single phase full bridge inverter has RLC load with R = 4 Ω, L = 35 mH and C = 155 μF. The dc input voltage is 230 V and the output frequency is 50 Hz. Find the angle by which the third harmonic current will lead/lag the third harmonic output voltage.

A

67.25°

B

96.4°

C

49.87°

D

81.3°

Calculate the harmonic distortion component for an output signal having a fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.

A

3.83%

B

38.3%

C

83.3%

D

8.33%

A single phase half bridge inverter has a dc voltage source Vs/2 = 115 V. Find the rms value of the fundamental component of output voltage.

A

510 V

B

103.5 V

C

120 V

D

96 V

A single phase full bridge inverter has a dc voltage source Vs = 230 V. Find the rms value of the fundamental component of output voltage.

A

90 V

B

207 V

C

350 V

D

196 V

A single-phase bridge inverter has a square wave output voltage waveform, with odd harmonics present. What is the percentage of the fifth harmonic component to the fundamental component?

A

50 %

B

25 %

C

20 %

D

5 %