Answer / balaji

In squarewave pulse the output contains more ripples.. But
in Pulse width modulation(PWM)the ripples in the output is
very less...

Answer / prava

both magnitude and frequency can be controlled by PWM
technique where as in square wave pulse the magnitude
depends on the input only frequency can be controlled

two TG running in parallel at equal load.one TG CB tripped in reverse power relay.after tripping found its excitation was on & turbine running at rated speed.Please clearify why that TG tripped in reverse power ?

1 Answers   Bhel, Birla,

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1.Why hydrogen used for cooling in generators 2.Why electrical equipment protected by ground 3.Why earthing for transmission line 4.What is rms value of half wave rectified square wave. If Rms value of actual wave 2amps.

1 Answers   Power Grid,

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What are the advantages and disadvantages of open loop control system?

0 Answers  

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What should be cable size for 75KVA 380/220 3ph transformer

3 Answers  

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Define filter?

0 Answers  

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what is the mazor difference between the induction transformer and synchonous motor?what is the similarity between them?

1 Answers  

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apti mainly on logical reasoning, verbal and non-verbal ability (70 percent) and remaining technical. I was in ee but technical had mech ques like on turbines and welding.

0 Answers   TATA,

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why CFL lamp requires less electricity than a normal lamp?/

3 Answers  

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If there is major % of Voltage harmonics in the system, how can it be control or reduced?

0 Answers   JCN, Wipro,

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what is the RESTART INHIBIT protection?

1 Answers   Thermax,

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what is ACB

6 Answers  

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What is a soft start?

4 Answers  

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