Answer Posted / dini

cctv is a closed circuit television its used in the
buildings,IT industries,supermalls,traffic signals,..etc to
protect from thefts,malicious activitiies,survilience,..

it had many types,
1.analog camera
2.ip camera

it requires power on 12V and bnc connector helps to connect
camera for dvr or dvm.

how to select energy meter? have any calculation?

2949

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explain remenance . differentiate high remenance type ct & low remenance type ct

2092

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I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)

2093

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What are the protection required for Transformer, motor, Line, Generator, capacitor, that all i have to refer which standard?(Like Transformer detail IS 2026)

1953

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what is meant by impedance & transient protection?

2074

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what is servo motor and how to work it.

1874

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What does bode plots shows?

1113

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What is the formulae of Megger value for a A.C.Motor

2832

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What is thresh hold value of current?

2105

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if we run a 3 phase machine on two phase what will happend??? given answer with solid reason please

2056

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I have one ct of ratio 3000-2000/1 Amp its knee point voltage mentioned on name plate is 500-333/30mA-50mA at Vk/2. in secondary box there is three terminal named 1S1, 1S2, 1S3 then on which terminal obtained the knee point voltage ie 1S1-1S2 OR 1S1-1S3 & also specify the knee point voltage for the ratio 3000 from name plate.

2397

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how tto ingress mw in turbine explain.procedure ?

2235

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Why electrical power generation and transmission done in 3 phase system not more than 3 phase ?

3024

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why to use freewheeling diode ( diode in revers bias mode) across dc coil

4934

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What are the two major types of control system?

1056

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