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).

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

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 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 half bridge inverter has load R = 2 Ω and a dc voltage source Vs/2 = 115 V. Find the rms value of the fundamental load current.

A

10.25 A

B

51.7 A

C

86 A

D

24.8 A

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°

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 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

The armature winding of a 2-pole, 3-phase alternator for each phase is distributed in a number of slots per phase. The RMS value of the voltage per phase is less than the RMS value of the voltage per coil multiplied by the number of coils in series because the _________

A

RMS value of the voltage in different coils of the phase is different

B

equal RMS voltages in different coils of the phase has mutual phase difference

C

maximum value of the induced voltage in different coils of the phase are different

D

different coils of the phase pass through different saturated regions of the magnetic circuit

A single phase half bridge inverter has RLC load. The dc input voltage (Vs/2) = 115 V and the output frequency is 50 Hz. The expression for the load voltage up to the fifth harmonic will be given by

A

146 sin 314t + 48.81 sin 314t + 58.57 sin 318t + 28.31 sin 318t + 3.686 sin 318t

B

146 sin 314t + 48.81 sin (3 x 314t) + 29.28 sin (5 x 318t)

C

146 sin 314t + 48.81 sin (2 x 314t) + 58.57 sin (3 x 318t)

D

none of the mentioned