Alternator and Induction Generator MCQs (Part-4)

What type of power does an alternator generate?

A Direct Current (DC)
B Alternating Current (AC)
C Reactive Power
D Constant Power

What is the primary component of an induction generator that differs from a synchronous generator?

A Rotor construction
B Need for external excitation
C High efficiency
D Connection to the grid

In an alternator, what is the function of the rotor?

A To convert electrical energy to mechanical energy
B To generate a rotating magnetic field that induces voltage in the stator
C To supply the stator with DC power
D To regulate the output frequency

What is the role of the stator windings in an alternator?

A To produce the magnetic field
B To convert mechanical energy to electrical energy
C To carry the induced AC voltage generated by the rotor
D To regulate the alternator’s output frequency

Which of the following is the main advantage of using a three-phase alternator?

A It reduces power losses
B It provides a smoother and more constant power supply
C It increases the voltage output
D It is simpler to construct and maintain

What is the typical use of a single-phase alternator?

A Power plants
B Small-scale or residential applications
C High-voltage transmission
D Industrial machinery

What does the excitation system in an alternator control?

A Rotor speed
B Voltage regulation
C Power factor
D Frequency

What is the synchronous speed of an alternator?

A The speed of the rotor relative to the stator
B The speed at which the rotor spins
C The speed at which the stator’s magnetic field rotates
D The speed required to generate the output voltage

What is a salient pole rotor used in?

A High-speed alternators
B Low-speed, large alternators
C Small induction generators
D Induction motors

Which factor does NOT affect the output voltage of an alternator?

A Rotor speed
B Excitation current
C Number of poles
D Stator resistance

In a three-phase alternator, what happens if one phase is overloaded?

A The alternator will stop functioning
B The alternator compensates by redistributing the load across the other phases
C The power factor increases
D The alternator continues to function at reduced voltage

What is the primary reason for using capacitors in an induction generator?

A To increase the efficiency
B To provide the necessary reactive power for excitation
C To filter harmonic distortions
D To regulate the voltage

How does an alternator generate power?

A By converting chemical energy to electrical energy
B By converting mechanical energy to electrical energy through electromagnetic induction
C By using wind energy to rotate the rotor
D By compressing air to generate electrical current

Which component in an alternator regulates the excitation voltage?

A Voltage regulator
B Stator windings
C Rotor windings
D Field current

What is the main disadvantage of using an induction generator in renewable energy applications?

A It requires a constant external power source for excitation
B It is expensive to maintain
C It generates DC power
D It has lower efficiency than synchronous generators

What is the frequency of the output voltage in an alternator determined by?

A Load current
B Rotor speed and the number of poles
C Excitation current
D The stator resistance

What type of alternator rotor is typically used for high-speed applications?

A Salient pole rotor
B Cylindrical rotor
C Permanent magnet rotor
D Induction rotor

What is the primary purpose of a power factor correction device in an alternator?

A To regulate the rotor speed
B To reduce reactive power and improve efficiency
C To synchronize the alternator with the grid
D To filter the output signals

What happens to the voltage output of an alternator when the excitation is increased?

A The voltage decreases
B The voltage increases
C The power factor improves
D The frequency increases

What is the frequency of the output voltage in an alternator determined by?

A Load current
B Rotor speed and the number of poles
C Excitation current
D The stator resistance