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  • INTERVIEW QUESTIONS ELECTRONICS AND COMMUNICATION (EC) ENGINEERING DETAILS
    Question :
    What is a rectifier?
    Category Electronics and Communication (EC) Engineering Interview Questions
    Rating (0.2) By 234 users
    Added on 6/19/2011
    Views 447
    Rate it!
    Answers:

    A rectifier changes alternating current into direct current. This process is called rectification. The three main types of rectifier are the half-wave, full-wave, and bridge. A rectifier is the opposite of an inverter, which changes direct current into alternating current.

    HWR- The simplest type is the half-wave rectifier, which can be made with just one diode. When the voltage of the alternating current is positive, the diode becomes forward-biased and current flows through it. When the voltage is negative, the diode is reverse-biased and the current stops. The result is a clipped copy of the alternating current waveform with only positive voltage, and an average voltage that is one third of the peak input voltage. This pulsating direct current is adequate for some components, but others require a more steady current. This requires a full-wave rectifier that can convert both parts of the cycle to positive voltage.

    FWR- The full-wave rectifier is essentially two half-wave rectifiers, and can be made with two diodes and an earthed centre tap on the transformer. The positive voltage half of the cycle flows through one diode, and the negative half flows through the other. The centre tap allows the circuit to be completed because current cannot flow through the other diode. The result is still a pulsating direct current but with just over half the input peak voltage, and double the frequency.



    A rectifier is a device which convert
    AC signal to pulsating DC signal by using two or more P-N junction diode.
    There are three main type of rectifier half-wave,full-wave and bridge.
    HWR-In half-wave rectifier, rectifying element conducts only during +ve half cycle of input AC supply.
    Efficiency of HWR=40.6%
    FWR-In full-wave rectifier, rectifying elements conducts during both +ve and -ve half cycle of input AC supply.
    Efficiency of FWR=81.2%
    Bridge Rectifier-The bridge rectifier circuit is essentially a full-wave rectifier circuit using four diode forming the four arms of
    an electrical bridge



    Posted by: chandan kumar jha    

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    rectifier is ac to dc converter



    Posted by: mohananu    

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    Rectifiers is used to convert Alternate current into Direct current and to product Constant DC.



    Posted by: justin    

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    rectifier is used to convert ac to dc there are three types:
    1. half wave rectifier
    2. full wave rectifier
    3. bridge rectifier



    Posted by: vishnupriya    

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    Rectifier is the device which converts alternate current to direct current,which is made up of diodes .there are three types of rectifier
    1)central trap rectifier
    2)half wave rectifier
    3)full wave rectifier



    Posted by: Hariom dubey    

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    rectifier is a device which is used to convert ALTERNATE CURRENT into DIRECT CURRENT . the efficiency of the rectifier is not 100% and output by rectifier is not proper dc but it is in the form of ripples so we use filter for proper dc output.
    two types of rectifiers r -
    1 half wave rectifier (eff.40.1%)
    2 full wave rectifier (eff.80.2%)



    Posted by: munish sharma    

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    rectifier is a device used to convert ac quantity to pulsating dc quantity(which contains both ac and dc is called pulsating dc)



    Posted by: sruthi muddam    

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    a rectifier is which a device which converts a.c voltage to pulsating d.c
    voltage,using one or more p-n junction diodes.



    Posted by: anilbabu    

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    rectifier is a device which converts ac to pulsating dc its output have some noise it eliminates by using filter



    Posted by: nasrath    

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    the device it's convert Ac to Dc



    Posted by: Chetan jodatti    

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    Rectifier is a electrical Device to convert A.C. (Alternating Current to Pulsating D.C. (Direct Current).
    There are three Type
    1 Half Wave Rectifier
    2 Full Wave Rectifier
    3 Bridge Wave Rectifier
    Rectifier is Opposite of Inverter
    Inverter is a Device to convert D.C. to A.C.



    Posted by: Rahul Jha     

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