# Explain the sinusoidal harmonic reduction techniques for cylcoconverters.

Explain the sinusoidal harmonic reduction techniques for cylcoconverters.

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Answer : Sinusoidal Steady-State Analysis - nodal analysis super node problem solution

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Answer : An ac voltmeter using full -wave rectification and having a sinusoidal input has an ac sensitivity equal to 0.9 times dc sensitivity

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Description : Explain following techniques related to energy conservation in transmission and distribution system. (i) By balancing phase currents (ii) Variable technical losses (I2R losses).

Answer : (i) Balancing Phase currents: Proper (healthy balanced) three phase loads always draw equal currents in all lines but single phase loads in the 3 phase 4 wire system or loads connected between two ... . 11) Minimize I2R losses. 12) Balance the load currents. 13) Regulate the system voltages.

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Description : Explain any four factors affecting size reduction.

Answer : Factors affecting Size Reduction: i. Hardness: Soft material easytobreak than hard. ii. Toughness: Drug with fibrous nature or those having high moisture content are tough and hard to reduce in size ... the size reduction of the material in a machine depends upon the bulk density of the substance.

Description : Explain any four factors affecting size reduction

Answer : Factor affecting size reduction are:  1.Hardness: Soft material easy break than hard.  2.Toughness: Drug with fibrous nature or those having high moisture content are tough and hard to reduce in ... of the size reduction of the material in a machine depends upon the bulk density of the substance.

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Description : Define Amplitude and Phase of Sinusoidal quantity.

Answer : Amplitudes are expressed either as instantaneous values or mostly as peak values.  Amplitude is the fluctuation or displacement of a wave from its mean value.  Phase is the position of a ... .  Phase an expression of relative displacement between or among waves having the same frequency .

Description : Draw sinusoidal waveform of 3 phase emf and indicate the phase sequence.

Answer : Phase sequence is R-Y-B.

Description : Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous figure is straight line. The phase shift between the two signals would be (1) Zero (2) 90 degrees (3) Either zero or 180 degrees (4) Either 90 degrees or 270 degrees

Answer : Two sinusoidal signals having the same amplitude and frequency are applied to the X and Y inputs of a CRO. The observed Lissajous figure is straight line. The phase shift between the two signals would be (1) Zero (2) 90 degrees (3) Either zero or 180 degrees (4) Either 90 degrees or 270 degrees

Description : The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is  (A) 10 A (B) 14.14 A (C) 15 A (D) 17.32 A

Answer : The rms value of the current in a wire which carries a d.c. current of 10 A and a sinusoidal alternating current of peak value 20 A is 17.32 A

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