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What is single polarity and double polarity of pulse amplitude modulation?

SINGLE POLARITY: In single polarity PAM the height of the pulse is made larger than the maximum negetive value of the signla so that it remains positive even when the input is negetive DOUBLE POLATRITY: In double polarity PAM the pulse height is made proportional to the amplitude of the signal at the instant of the sampling P.Nagarjuna B-tech 3rd year, ECE, Sri Indu college of engineering and technology


What happen when the polarity of transformer reversed?

You cannot 'reverse' the polarity of a transformer -it is either wound with 'additive polarity' or 'subtractive polarity', and there's not much you can do about it! For a single transformer, its polarity doesn't really matter. But if you are going to parallel two transformers, then you must know the polarity of each transformer in order to avoid harmful circulating currents in their secondary windings.


Why is the polarity of the output and input is same in ac transformer?

polarity play essential role in protection purpose if you have done wrong polarity in yours system then protection will operate under normal operationFurther AnswerThe polarity of a single-phase transformer describes the phase relationship of the secondary voltage relative to the primary voltage. Polarity is described as being either 'additive' or 'subtractive'. Knowing a transformer's polarity is one of the essential requirements for paralleling a pair of individual transformers.


What are two examples of polarity?

-- negative polarity -- positive polarity


What is the procedure to polarity test a 3 phase transformer?

A 'polarity test' is conducted on a single-phase transformer, not a three-phase transformer (or transformer bank). The polarity of a single-phase transformer being important if two transformers are to be connected in parallel, or three transformers are going to be connected to form a three-phase transformer bank.'Angular displacement' is, to a three-phase transformer, what 'polarity' is to a single-phase transformer. So you really should be asking about angular displacement, rather than polarity. Angular displacement, or 'phase displacement', is the angle by which the secondary line voltage lags the primary line voltage.Angular displacement can be determined either by drawing a phasor diagram of the three-phase connection and measuring it, or by looking up the connection in a vector-group chart/table -you would nor normally 'calculate' angular displacement.


If we change the polarity of capacitor in ceiling fan why it starts rotating reverse direction?

by changing the polarity of capacitor of single phase ceiling fan can we change the direction of rotation from anticlockwise to clockwise


What problems are there with reverse polarity?

Reversing polarity ,changes the rotation of the device you are changing polarity on.


Does space have polarity?

No. Electromagnetic fields have polarity.


How does a speaker polarity work?

a speaker polarity is sub mainframe of the ................................


Do integrated circuits have polarity?

Yes integrated circuits have polarity.


Why the resistor does not have polarity?

they do not have any electrical property that is polarity sensitive


What is the polarity of C Cl14?

Its polarity is zero.CCl4 is non polar