Statement-wise Verification

• Statement 1 - Correct.
  Net Positive Suction Head (NPSH) is a critical parameter to prevent cavitation in pumps.
  Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH.
• Statement 2 - Correct.
  Priming is necessary for centrifugal pumps if the pump is located above the liquid level (suction lift).
  When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself.
• Statement 3 - Correct.
  A booster pump is used to maintain constant pressure in high-rise water distribution systems
  Booster pumps are used to maintain required pressure in tall-building distribution zones.

Core Concept

Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH. When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself. Booster pumps are used to maintain required pressure in tall-building distribution zones.

Formula / Key Relationship

Require NPSH_available > NPSH_required with design margin.

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.

Exam Shortcut / Approach

Cavitation questions: compare available and required NPSH.

Common Mistake

Priming is unnecessary only for self-priming arrangements or when suction is already flooded.

Quick Revision

NPSH Priming and Booster Pumps is linked with Pump Operation, Pumping Systems and Electrical Building Services. Cavitation questions: compare available and required NPSH.

Statement-wise Verification

• Statement 1 - Correct.
  Net Positive Suction Head (NPSH) is a critical parameter to prevent cavitation in pumps.
  Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH.
• Statement 2 - Correct.
  Priming is necessary for centrifugal pumps if the pump is located above the liquid level (suction lift).
  When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself.
• Statement 3 - Correct.
  A booster pump is used to maintain constant pressure in high-rise water distribution systems
  Booster pumps are used to maintain required pressure in tall-building distribution zones.

Core Concept

Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH. When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself. Booster pumps are used to maintain required pressure in tall-building distribution zones.

Formula / Key Relationship

Require NPSH_available > NPSH_required with design margin.

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.

Exam Shortcut / Approach

Cavitation questions: compare available and required NPSH.

Common Mistake

Priming is unnecessary only for self-priming arrangements or when suction is already flooded.

Quick Revision

NPSH Priming and Booster Pumps is linked with Pump Operation, Pumping Systems and Electrical Building Services. Cavitation questions: compare available and required NPSH.

Statement-wise Verification

• Statement 1 - Correct.
  Net Positive Suction Head (NPSH) is a critical parameter to prevent cavitation in pumps.
  Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH.
• Statement 2 - Correct.
  Priming is necessary for centrifugal pumps if the pump is located above the liquid level (suction lift).
  When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself.
• Statement 3 - Correct.
  A booster pump is used to maintain constant pressure in high-rise water distribution systems
  Booster pumps are used to maintain required pressure in tall-building distribution zones.

Core Concept

Centrifugal pumps require sufficient pressure at the suction to avoid local vaporization and cavitation; this is evaluated using NPSH. When a pump is above the liquid level, the casing/suction line must be primed because a centrifugal pump cannot normally evacuate air and establish suction by itself. Booster pumps are used to maintain required pressure in tall-building distribution zones.

Formula / Key Relationship

Require NPSH_available > NPSH_required with design margin.

Why the Other Options Are Wrong

Option A is incorrect because it omits correct statement(s) 3. Option B is incorrect because it omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2.

Exam Shortcut / Approach

Cavitation questions: compare available and required NPSH.

Common Mistake

Priming is unnecessary only for self-priming arrangements or when suction is already flooded.

Quick Revision

NPSH Priming and Booster Pumps is linked with Pump Operation, Pumping Systems and Electrical Building Services. Cavitation questions: compare available and required NPSH.