Question

In a diffuser, the primary purpose is to

• A. Increase velocity
• B. Decrease pressure
• C. Increase pressure
• D. Increase Mach number

Hint:

For subsonic flow, \[ \boxed{ \text{Diffuser} \Longrightarrow V\downarrow,\; P\uparrow } \] while a nozzle produces \[ \boxed{ V\uparrow,\; P\downarrow. } \]

Answer 1

The Correct Option is C

Step 1: Recall the function of a diffuser. A diffuser is a flow passage designed to reduce the velocity of a fluid.

Step 2: Determine its primary purpose. As the fluid velocity decreases, \[ \boxed{ \text{kinetic energy is converted into pressure energy.} } \] Thus, the static pressure increases. Therefore, \[ \boxed{\text{Increase pressure}} \] is the correct answer. Thus, \[ \boxed{(C)} \] is the correct answer.