Rectifier Questions

A rectifier is a device that changes alternating current (AC) to direct current (DC). A rectifier can take the forms of solid-state diodes, vacuum tube diodes, mercury-arc valves, and various silicon-based semiconductor switches.

Rectifiers are used in power supplies that provide the necessary DC voltage for the electronic component or devices. It offers high rectifier efficiency and low power loss. It uses four diodes to convert both half cycles of the input AC into DC output.

Some applications of rectifiers include:

• Rectifiers are used in electric welding to provide polarized voltage
• Half-wave rectifiers are used as a mosquito repellent
• Half-wave rectifiers are used as a signal peak detector in AM radio
• Rectifiers are used in modulation, demodulation and voltage multipliers

Important Rectifier Questions with Answers

1. Choose the correct answer: _____ rectifier is used in mosquito repellent.

1. Half-wave rectifier
2. Full-wave rectifier

Answer: a) Half-wave rectifier

Explanation: Mosquito repellent uses the half-wave rectifier.

2. Rectifier can take the form of ______

1. Node
2. Rheostat
3. Vacuum tube diodes
4. Resistors

Answer: c) Vacuum tube diodes

Explanation: Rectifiers can take the form of semiconductor diodes, silicon-controlled rectifiers, and vacuum tube diodes.

3. Which process straightens the direction of the current?

1. Amplification
2. Lithification
3. Straightfication
4. Rectification

Answer: d) Rectification

Explanation: Rectification is the process of converting AC to DC.

4. Choose the correct answer: Rectifiers allow current to flow in _____

1. Single direction
2. Multi-direction

Answer: a) Single direction

5. Which of the following is used in a rectifier?

1. Inductor
2. Capacitor
3. Resistor
4. Diode

Answer: d) Diode

Explanation: Diodes are used in half-wave and full-wave circuits.

6. Choose YES or NO: Can rectifier circuits be single-phase?

1. YES
2. NO

Answer: a) YES

Explanation: Rectifier circuits may be single-phase or multi-phase. The low power rectifiers for domestic equipment are single-phase.

7. Power rectifiers are used in ______

1. Laptops
2. Televisions
3. Video game systems
4. All the above options

Answer: d) All the above options

Explanation: Household appliances use power rectifiers to create power.

8. What is the reciprocal of the resistance known as?

The reciprocal of the resistance gives conductance. The reciprocal of the resistance is measured in siemens or mhos.

9. Bridge Rectifier is a _____

1. Half-wave rectifier
2. Full-wave rectifier

Answer: b) Full-wave rectifier

Explanation: A bridge rectifier is a type of full-wave rectifier that uses four diodes to convert both half-cycles of the AC input into DC output.

10. Give two types of full-wave rectifiers.

Types of full-wave rectifiers are:

• Bridge rectifier
• Center-Tap Rectifier

Practice Questions

1. What is rectification?
2. How many diodes are used in a bridge rectifier?
3. Explain the centre-tap rectifier.
4. What is a rectifier?
5. What are the types of rectifiers?

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