EGSA Prime Mover and Governors Questions and Answers

Question 1

A technician is setting up two paralleled generator sets of different power ratings to share a load proportionally. Which governor mode is essential for this application?

Accepted Answer

Droop mode

Answer

Isochronous mode

Answer

Hunting mode

Answer

Full-load mode

Question 2

What is the primary function of a governor on a generator's prime mover?

Accepted Answer

To maintain a constant engine speed under varying loads.

Answer

To regulate the terminal voltage output.

Answer

To control the flow of engine coolant.

Answer

To monitor the lubricating oil pressure.

Question 3

A diesel generator experiences 'hunting,' where the engine RPM fluctuates up and down erratically under a steady load. Which of the following is the MOST likely cause related to the governor system?

Accepted Answer

An improperly adjusted gain or stability setting

Answer

A clogged fuel filter

Answer

Low engine oil level

Answer

A faulty Automatic Voltage Regulator (AVR)

Question 4

Which of the following prime movers is characterized by its high power-to-weight ratio, fewer moving parts, and suitability for continuous, high-load operation, making it ideal for large-scale power plants?

Accepted Answer

Gas Turbine

Answer

Reciprocating Diesel Engine

Answer

Hydro Turbine

Answer

Microturbine

Question 5

A generator set is operating in isochronous mode. What will happen to the engine speed as a heavy electrical load is suddenly applied?

Accepted Answer

The speed will momentarily dip and then quickly return to the original set speed.

Answer

The speed will decrease proportionally to the load and remain lower.

Answer

The speed will increase to compensate for the voltage drop.

Answer

The speed will fluctuate continuously until the load is removed.

Question 6

When paralleling two generator sets, the real power (kW) load sharing is primarily controlled by adjusting each unit's:

Accepted Answer

Governor speed setting

Answer

Automatic Voltage Regulator (AVR)

Answer

Circuit breaker trip settings

Answer

Coolant temperature