Question:
Which of the following is an example of Non Positive-Displacement Pump?
Which of the following is an example of Non Positive-Displacement Pump?
Show Hint
Centrifugal = Speed based (Dynamic). Piston/Gear/Screw = Volume based (Positive Displacement).
Updated On: Jul 23, 2026
- Centrifugal pump
- Piston pump
- Gear pump
- Screw pump
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Industrial pumps are divided into two main categories:
1. Positive Displacement (PD) Pumps: They trap a fixed volume of fluid and force it into the discharge pipe.
2. Non-Positive Displacement (Dynamic) Pumps: They use kinetic energy (rotation) to move the fluid.
Step 2: Detailed Explanation:
Centrifugal Pump (Option 1): This is the most common pump in the dairy industry. It uses a rotating impeller to add velocity to the milk. The liquid is then slowed down in the casing, converting velocity into pressure. It is a Non-Positive Displacement pump because if you block the discharge pipe, the impeller will just spin ("churn") the liquid inside without the pressure rising to dangerous levels immediately. The flow rate changes significantly with changes in discharge pressure.
Positive Displacement Examples:
- Piston Pump (Option 2): Uses a reciprocating plunger.
- Gear Pump (Option 3): Uses intermeshing gears to trap and move fluid.
- Screw Pump (Option 4): Uses a rotating screw to move fluid along an axis.
In PD pumps, if you block the discharge, the pressure will rise until something breaks or a safety valve opens. They deliver a constant volume regardless of the pressure.
Step 3: Final Answer:
The centrifugal pump is the example of a non-positive displacement pump.
Industrial pumps are divided into two main categories:
1. Positive Displacement (PD) Pumps: They trap a fixed volume of fluid and force it into the discharge pipe.
2. Non-Positive Displacement (Dynamic) Pumps: They use kinetic energy (rotation) to move the fluid.
Step 2: Detailed Explanation:
Centrifugal Pump (Option 1): This is the most common pump in the dairy industry. It uses a rotating impeller to add velocity to the milk. The liquid is then slowed down in the casing, converting velocity into pressure. It is a Non-Positive Displacement pump because if you block the discharge pipe, the impeller will just spin ("churn") the liquid inside without the pressure rising to dangerous levels immediately. The flow rate changes significantly with changes in discharge pressure.
Positive Displacement Examples:
- Piston Pump (Option 2): Uses a reciprocating plunger.
- Gear Pump (Option 3): Uses intermeshing gears to trap and move fluid.
- Screw Pump (Option 4): Uses a rotating screw to move fluid along an axis.
In PD pumps, if you block the discharge, the pressure will rise until something breaks or a safety valve opens. They deliver a constant volume regardless of the pressure.
Step 3: Final Answer:
The centrifugal pump is the example of a non-positive displacement pump.
Was this answer helpful?
0
0
Top ICAR AIEEA Dairy Technology Questions
- As per legal standards (FSSR, 2011), the acidity (%LA) of chakka should not be more than:
- Which of the following food additive is permitted as preservative in paneer?
- Given below are four statements:
Statement (I) : Homogenisation breaks down fat globules in milk into smaller entities.
Statement (II) : Homogenisation breaks down fat globules and casein micelles in milk into smaller entities.
Statement (III) : Homogenisation slightly increases viscosity of milk.
Statement (IV) : Homogenisation improves the appearance of milk.
In light of the above statements, choose the most appropriate answer from the options given below. - With regard to temperature of operation, place the following unit operations in sequence in an increasing order of temperature:
(i) Sterilisation
(ii) Thermisation
(iii) Homogenisation
(iv) Bactofugation and
(v) HTST pasteurization.
Choose the correct answer from the options given below : - “Narampak” and “karapak” refer to varieties of sandesh with reference to which of the following parameters ?
View More Questions
Top ICAR AIEEA Heat Transfer and Unit Operations Questions
- With regard to temperature of operation, place the following unit operations in sequence in an increasing order of temperature:
(i) Sterilisation
(ii) Thermisation
(iii) Homogenisation
(iv) Bactofugation and
(v) HTST pasteurization.
Choose the correct answer from the options given below : - Match List-I with List-II
\begin{tabular{ll} List-I (Name of Process) & List-II (Temperature/time)
(A) Pasteurization & (I) \(60\ ^\circ\text{C}\) no hold
(B) Sterilisation & (II) \(55-60\ ^\circ\text{C}\) no hold
(C) Homogenisation & (III) \(72\ ^\circ\text{C}\) 15 sec
(D) Bactofugation & (IV) \(118\ ^\circ\text{C}\) 15min
Choose the correct answer from the options given below : - In falling film milk evaporator, the temperature difference between milk and steam should be approximately around :
- Indirect UHT treatment can be done using which of the following methods ?
- Which of the following value is related to sterilization process ?
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions