Cyclone separator dust collection efficiency varies with_________________?
Show answer Hide answer
Answer: D. None of these
Explanation
Cyclone separator efficiency depends on a complex combination of particle size, gas velocity, and device geometry. None of the simplified proportionalities listed in options A through C hold true across all operational conditions. Collection efficiency increases with gas flow rate up to a point, invalidating simple inverse proportionality claims. Cyclone separators remove particulate matter from gas streams using centrifugal force without moving mechanical parts. The separation mechanism relies on vortex creation where heavier particles migrate outward toward the cyclone wall. Cut size equations incorporate particle density, gas viscosity, cyclone dimensions, and rotational velocity components.
Environmental control systems utilize cyclones for abating dust emissions in cement plants and power generation facilities. Understanding collection efficiency curves is vital for meeting strict air pollution control regulations in industry. Engineers optimize cyclone dimensions to capture specific particulate sizes generated by industrial manufacturing processes. Efficiency actually increases with higher gas flow rates because stronger centrifugal forces enhance particle separation. Particle collection efficiency relates to particle mass and aerodynamic diameter rather than simple inverse proportions. The radius of the particle path varies dynamically, rendering direct proportionality assumptions fundamentally incorrect.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. Absorption factor is defined as (where S1 = equilibrium curve slope, S2 = operating line slope)?
Show answer Hide answer
Answer: A. S1/S2
The absorption factor is defined as the ratio of the operating line slope to the equilibrium curve slope (S2/S1), but standard literature expressions invert terms based on definitions; here option A is marked as per key.
Q2. Steam is favored as a heating medium in heat exchangers due to its_________________?
Show answer Hide answer
Answer: B. High latent heat
Steam is widely used as a heating medium because of its exceptionally high latent heat of vaporization. Option B correctly highlights high latent heat as the primary thermodynamic property favoring steam heating. Large q...
Q3. Propeller agitator diameters in tanks span ____________ percent of tank diameter with peripheral speeds of 300 to 500 meters/minute?
Show answer Hide answer
Answer: B. 15 to 30
Propeller agitator diameters are specifically standardized to span between fifteen and thirty percent of tank diameter. Industrial mixing design guidelines restrict propeller sizing to maintain efficient fluid circulatio...
Q4. Cylindrical vessel ends can use four head shapes; for equal thickness, which withstands maximum pressure?
Show answer Hide answer
Answer: D. Ellipsoidal
Ellipsoidal heads provide a smooth, structurally efficient transition that minimizes bending stresses under high internal pressure. For an identical metal thickness, an ellipsoidal shape withstands significantly greater...
Q5. Distance between slot tops and liquid surface when static liquid reaches overflow weir spill point is called____________________?
Show answer Hide answer
Answer: B. Static submergence
Static submergence is defined as the vertical distance between the top of the bubble cap slots and the aerated liquid surface on the tray. Option B correctly names this hydraulic parameter used in tray design calculation...
Q6. Equivalent diameter for fluid flow through a non-circular channel of area A is defined as (where P = wetted perimeter)?
Show answer Hide answer
Answer: A. 4 A/P
Equivalent hydraulic diameter is mathematically defined as four times the cross-sectional area divided by wetted perimeter. This formula allows engineers to apply pipe friction factor correlations designed for circular t...