Centrifugal Pump Characteristics Analysis
The question asks to identify the statement that is not correct regarding centrifugal pumps.
Analysis of Options:
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Statement 1: They can not be used for pumping water containing sediments (silt, sand etc).
This statement is incorrect. While standard centrifugal pumps may be damaged by abrasive materials, specialized designs (e.g., using harder materials, specific impeller types like vortex impellers) exist to handle fluids with suspended solids. Therefore, it's not universally true that they *cannot* be used.
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Statement 2: They are quite durable and safe against high pressure.
This statement is generally correct. Centrifugal pumps are known for their robust construction and can operate reliably under various pressure conditions, depending on their design specifications.
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Statement 3: They can be installed in limited space.
This statement is generally correct. Centrifugal pumps often have a compact design compared to other pump types, making them suitable for installations where space is limited.
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Statement 4: Such pumps require priming.
This statement is generally correct. Most common centrifugal pumps are not self-priming and require the casing and impeller to be filled with liquid before startup to create the necessary suction. Self-priming designs are available but not the default for all types.
Conclusion:
The statement that is not correct in the context of centrifugal pumps is that they absolutely cannot be used for pumping water containing sediments.
Important Questions from Miscellaneous
- Which of the following relationships is/are not true?
(A). Most probable velocity = $\sqrt{\frac{2RT}{M}}$
(B). PV = $\frac{3}{2}kT$
(C). Compressibility factor Z = $\frac{pV}{nRT}$
(D). Average kinetic energy of gas = $\frac{1}{2}kT$
Choose the correct answer from the options given below - Match List-I with List-II
List-I List-II Electronic Configuration First Ionisation energy (kJ mol$^{-1}$) (A). ns$^2$ (I). 2100 (B). ns$^2$np$^1$ (II). 1400 (C). ns$^2$np$^3$ (III). 800 (D). ns$^2$np$^6$ (IV). 900
Choose the correct answer from the options given below: - The shielding constant of a 2p electron (calculated using Slater's rules) is
- Match List-I with List-II
List-I List-II Spectroscopy Property (A). Raman (I). Polarizability (B). FTIR (II). Dipole Moment (C). UV-Visible (III). Absorbance (D). NMR (IV). Spin
Choose the correct answer from the options given below: - The structure of protein comprises of:
(A). Primary structure of protein is associated with amino acids
(B). Secondary structure of protein is associated to peptides
(C). Tertiary structure of protein is associated with polypeptide chains
(D). Quaternary structure of protein is associated with polypeptide chains
Choose the correct answer from the options given below:
