Question

If there is no change in static enthalpy and static pressure across a rotor, then the turbo-machine is called

• A. reaction machine
• B. impulse machine
• C. 50% reaction machine
• D. free vortex machine

Hint:

Impulse turbines are useful in applications where high-speed, low-pressure steam is available.

Answer 1

The Correct Option is B

Step 1: Define Impulse Machine.
In an impulse machine, the fluid dynamics are such that the enthalpy and pressure essentially remain unchanged across the rotor. The energy transfer occurs primarily due to changes in velocity or kinetic energy of the flow.