The NG parameter is described as which of the following?

The NG parameter is described as which of the following?

• A. Variable
• B. Constant
• C. Cyclic
• D. Proportional

Answer: (A)

NG is the gas generator speed, which changes as the engine responds to power demand and operating conditions. Because increasing or decreasing throttle/collective alters fuel flow and air flow, the gas generator must speed up or slow down accordingly to meet the required power. That dynamic response means NG is not fixed or constant. It also isn’t inherently cyclic—any fluctuations are due to transient engine behavior, not a built-in repeating cycle. Nor is NG simply proportional to another parameter; the relationship varies across the operating envelope because engine control loops and multivariable interactions (air supply, fuel, loading) shape how NG behaves. So NG is best described as a variable parameter.

NG is the gas generator speed, which changes as the engine responds to power demand and operating conditions. Because increasing or decreasing throttle/collective alters fuel flow and air flow, the gas generator must speed up or slow down accordingly to meet the required power. That dynamic response means NG is not fixed or constant. It also isn’t inherently cyclic—any fluctuations are due to transient engine behavior, not a built-in repeating cycle. Nor is NG simply proportional to another parameter; the relationship varies across the operating envelope because engine control loops and multivariable interactions (air supply, fuel, loading) shape how NG behaves. So NG is best described as a variable parameter.