Generator and Transformers Questions

A generator converts mechanical energy into electrical energy. It works on the principle of electromagnetic induction. There are two types of generators:

• AC generator
• DC generator

AC generators are referred to as alternators. These devices convert mechanical energy into alternating currents. Two types of AC generators are synchronous generators and Induction generators.

DC generators work on the principle of Faraday’s laws of electromagnetic induction. A DC generator converts mechanical energy into a direct current. DC generators are classified into: Permanent magnet DC generators, Separately excited DC generators, and Self excited DC generators.

A device used in the transmission of electricity is known as the transformer. They are used in power generation grids. Transformers are classified into step-up and step-down transformers based on voltage levels. Based on the core medium, transformers are classified into air core transformers and iron core transformers.

Important Generator and Transformers Questions with Answers

1. Choose the correct answer: Which type of generator is a Shunt-wound generator?

1. AC generator
2. DC generator

Answer: b) DC generator

Explanation: A shunt-wound generator is a type of DC generator.

2. Fill in the blanks: The generator converts _____ energy into electrical energy.

1. Chemical
2. Thermal
3. Mechanical
4. Solar

Answer: c) Mechanical

Explanation: The generator converts mechanical energy to electrical energy.

3. Choose the correct answer: Transformer is a/an _____

1. Active component
2. Passive component

Answer: b) Passive component

Explanation: Transformers can transfer electrical energy from one electrical circuit to another or multiple circuits and are passive components.

4. Name the device which works on the principle of mutual inductance.

A transformer is a device that works on the principle of mutual inductance.

5. Choose the correct answer: In which of the following transformers is Np < Ns?

1. Step-up transformer
2. Step-down transformer

Answer: a) Step-up transformer.

Explanation: A step-up transformer converts a low voltage into a high voltage. The turns in the primary coil are less than the turns in the secondary coil.

6. What is the equation to find the EMF of the DC generator?

The formula gives the EMF equation of the DC generator:

Where,

• P – number of field poles
• Φ – flux produced per pole in Weber
• Z – total number of armature conductors
• A – number of parallel paths in the armature
• N – rotational speed of the armature in RPM

7. What are the components of an electric generator?

The components of an electric generator are the Frame, engine, alternator, fuel system, fuel system, voltage regulator, cooling system, lubrication system, exhaust system, charger, and main control.

8. Define Air-core transformers.

Air-core transformers are the type of transformers that transfer radio-frequency currents (currents used for radio transmission). It consists of two or more coils wound on an insulating coil form or solid insulating substance.

9. How is the transformer classified based on the design?

The transformer is classified based on the design as:

• Core-type transformer
• Shell-type transformer

10. State true or false: A transformer is a voltage-controlled device.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: A transformer is a device that controls voltage by increasing or decreasing it.

Practice Questions

1. Define an electric generator.
2. What is a transformer?
3. What are the various types of transformers?
4. Define DC generator.
5. How does a voltage regulator function in a transformer?