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Power delivered to load is _________ with an increase in harmonic distortion.

A

Increases

B

Decreases

C

Constant

D

Cannot predict

Correct Answer: Increases

The equation of output power (Pac)D = Pac (1+D2). It is clear that output power increases with distortion.

Power delivered to load calculated by five-point method can be equal to __________ (Pac is power delivered to load without distortion and D is the RMS of all Harmonic distortion)

A

Pac (1-D2)

B

Pac/D2

C

Pac (1+D2)

D

Pac D2

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

Under the condition for 3 phase alternator, maximum active power output, the delivered reactive power output is while under maximum reactive power output, the delivered reactive power is

A

negative, negative

B

positive, negative

C

negative, positive

D

positive, positive

If D1, D2, D3, D4 are the distortion produced by second, third, fourth, fifth respectively (others are insignificant). Then total harmonic distortion is __________

A

√(D12+D22+D32+D42)

B

√(D12+D32)

C

√(D22+D42)

D

√(D12+D22)

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 harmonic function is analytic if it satisfies the Laplace equation. If u(x, y) = 2x² - 2y² + 4xy is a harmonic function, then its conjugate harmonic function v(x, y) is

A

4y<sup>2</sup> - 4xy + constant

B

-4xy + 2y<sup>2</sup> - 2x<sup>2</sup> + constant

C

2x<sup>2</sup> - 2y<sup>2</sup> + xy + constant

D

4xy - 2x<sup>2</sup> + 2y<sup>2</sup> + constant

A step-down delta-star transformer, with per-phase turns ratio of 5 is fed from a 3-phase 1100 V source. The secondary of this transformer is connected through a 3-pulse type rectifier, which is feeding an R load. The power delivered to the load is 6839.3 Watts. The maximum value of the load current is √2 x 22 A. Fin, the rms value of output voltage Vo (rms)

A

257.3 V

B

220 V

C

261.52 V

D

248.32 V

A single phase full bridge inverter circuit, has load R = 2 Ω and dc source Vs = 230 V. Find the value of power delivered to the load in watts only due to the fundamental component of the load current.

A

5361.5 W

B

2142.5 W

C

21424.5 W

D

214.2 W

What is the cause of harmonic distortion in a power amplifier?

A

Exact replication of output signal

B

Perfectly synced harmonics

C

Non-linearity of transistors

D

Linearity of transistors