SA3 - Generator

What is the device that converts mechanical energy into electrical energy?

• Steam turbine

• Generator

• Wind turbine

• Electric motor

Answer explanation

The device that converts mechanical energy into electrical energy is a Generator. Generators use electromagnetic induction to produce electricity from mechanical energy.

According to Faraday's law of electromagnetic induction, what determines the value of induced emf across a conductor?

• Conductor's temperature

• Conductor's material

• Rate of change of flux linkage

• Conductor's length

Answer explanation

According to Faraday's law of electromagnetic induction, the value of induced emf across a conductor is determined by the rate of change of flux linkage.

Which type of generator is also known as an alternator?

• DC Generator

• Asynchronous Generator

• AC Generator

• Synchronous Generator

Answer explanation

An AC Generator is also known as an alternator, producing alternating current, making it the correct choice.

What is the purpose of load shedding in an electrical system?

• To increase plant loads

• To trip the generators

• To prevent equipment damage

• To reduce electrical load

Answer explanation

The purpose of load shedding in an electrical system is to reduce electrical load, helping to prevent equipment damage and maintain system stability.

How can the output voltage of a generator be controlled?

• By increasing the speed of rotation

• By controlling the DC excitation current to the rotor

• By adjusting the frequency

• By changing the conductor material

Answer explanation

By controlling the DC excitation current to the rotor

Which type of generator is typically found in off-grid applications?

• AC Generator

• Synchronous Generator

• Asynchronous Generator

• DC Generator

Answer explanation

In off-grid applications, DC generators are typically used due to their ability to directly produce DC power, which is often required for such setups.

What is the main difference between synchronous generators and asynchronous generators?

• Excitation method

• Frequency control

• Speed

• Size

Answer explanation

The main difference between synchronous generators and asynchronous generators is the speed at which they operate.

What is the purpose of synchronizing generators in parallel operation?

• To increase the output voltage

• To control the frequency

• To combine total power capacity

• To change the phase sequence

Answer explanation

To combine total power capacity

Which instrument is used to indicate if the frequency of a generator is faster or slower during synchronization?

• Synchroscope

• Three-Lamps method

• DC excitation current

• Rotor speed control

Answer explanation

The instrument used to indicate if the frequency of a generator is faster or slower during synchronization is a Synchroscope.

What is the armature of a generator?

• The prime mover of the generator

• The load connected to the generator

• The stationary part of the generator

• The rotating part of the generator

Answer explanation

The rotating part of the generator