Interview Questions and Answer about Rectifier

In this tutorial, we are going to learn about Interview Questions and Answer about rectifiers.

  1. What is Rectifier?


It is a device that converts two-direction alternating current (AC) into one-directional direct current (DC) it is called a rectifier.

2. What are the different types of rectifiers?


  • Here below are the different types of rectifiers.
  • Single phase and three phase rectifiers.
  • Half wave & full wave rectifiers.
  • Bridge rectifiers.
  • Uncontrolled and controlled rectifiers.

3. What is a single-phase rectifier?


Single-phase rectifiers are used to convert AC supply voltage and current to DC, as required for powering equipment and digital electronic devices. A single diode is required for a single-phase wave rectification and three diodes for a three-phase supply.

4. What is a 3 phase rectifier?


A 3 phase rectifier is a device that rectifies the input AC voltage with the use of a 3 phase transformer and 3 diodes which are connected to each of the three-phase of transformer secondary winding.

5. What is a half-wave rectifier?


A half-wave rectifier is a rectifier that produces half-cycles at the output for the one-half cycle of the input and zero output for the half cycle of the input. Half-wave rectifiers use one diode.

6. What is a full-wave rectifier?


Full-wave rectification rectifies the negative component of the input voltage to a positive voltage and then converts it into DC (pulse current) utilizing a diode bridge configuration. A full-wave rectifier uses more than four diodes.

7. What is a bridge rectifier?


It uses four or more diodes in a bridge circuit configuration which converts alternating (AC) current to a direct current (DC).

8. What is an uncontrolled rectifier?


It provides a fixed DC output voltage for a given AC supply where diodes are used only.

9. What is a controlled rectifier?


It gives an adjustable DC output voltage that is controlling the phase at which the devices are turned ON, where thyristors and diodes are used.

10. What are the applications of rectifiers?


Application and use of rectifiers:

  • It is used for powering appliances
  • These are used with transformers.
  • Uses of rectifiers in circuits.
  • It is used for modulation.
  • It is used in voltage multiplier.

11. Which diode is used in rectification?


They are also used in circuits where a large current must pass through the diode. Generally, diodes are made from silicon and therefore have a forward voltage drop of 0.7V.

Below are the diodes lists which are mostly used in rectifier.

Diode       Maximum Current      Maximum Reverse Voltage

1N4007        1A                              1000V

1N5401       3A                               100V

1N5408       3A                               1000V

12. What causes a rectifier to fail?


The rectifier failure involves the battery, If the link is bad and the voltage is faulty, this can cause the regulator rectifier to run hotter than usual. Things like poor grounding, a loose or weak battery and a worn battery connection can all lead to regulator failure.

13. Why filter is used in rectifiers?


The filter is a device that allows passing the DC component of the rectifier output. While the output of the filter will be steady DC voltage and capacitor is used to block the DC and allow AC to pass.

14. Why is bridge rectifier mostly used in circuits?


A bridge rectifier is preferred in high voltage applications because it has high peak inverse voltage. It has a high transformer utilization factor. It can be constructed with or without a transformer like it does not require a centre tap transformer.

15. What is the difference between a converter and rectifier?


The rectifier is AC to DC converted with the help of diodes only. A converter is also an AC to DC converter with the help of the thyristors. The rectifier converts AC into DC while converters convert AC into DC or DC into AC.

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