Basics of Alternators

What is the principle of operation of an alternator?

• Faraday's law of electromagnetic induction

• Coulomb's law

• Ohm's law

• Lenz's law

Which of the following is a type of armature winding?

• Series winding

• Parallel winding

• Double-layer winding

• Delta winding

Which of the following is a cause of harmonics in alternators?

• Short circuit

• Armature reaction

• Space harmonics

• Load imbalance

What is the function of the armature in a synchronous machine?

• To supply the excitation current

• To rotate the magnetic field

• To induce EMF

• To reduce noise

What is the main advantage of using a stationary armature in large alternators?

• Easy to insulate

• Requires less maintenance

• Reduces the overall size of the machine

• Simplifies the cooling system

The synchronous speed of an alternator is determined by which of the following?

• Number of poles and supply frequency

• Load connected to the alternator

• Excitation voltage

• Resistance of the windings

Which method is commonly used to suppress harmonics in alternators?

• Increasing the winding resistance

• Using a skewed rotor

• Adding a capacitor bank

• Reducing the number of turns in the winding

What is the purpose of the phasor diagram in alternators?

• To analyze the current distribution

• To determine the torque produced

• To represent the voltage relationships

• To measure the frequency

The EMF equation of an alternator depends on which of the following factors?

• Load resistance

• Armature current

• Magnetic flux and speed

• Number of slots

Which method is used to calculate the voltage regulation of an alternator?

• Direct loading

• Impedance drop method

• EMF method

• Potier method