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EXAM PREPARATION

Objective Question & Answer

QUESTION

Objective Question

Q.1

The residue on I.S. sieve No. 9 of ordinary portland cement should not exceed

साधारण पोर्टलैंड सीमेंट के लिए I.S. छलनी (sieve) संख्या 9 पर बचा हुआ अवशेष इससे अधिक नहीं होना चाहिए:
A
5%
B
10%
C
20%
D
30%
Answer ( Option B)

10%

Solution

According to Indian Standard IS 269 and IS 4031 (Part 1), the fineness of cement is tested by dry sieving through an

I.S.Sieve No. 9 (which has a mesh size of 90 microns). For Ordinary Portland Cement (OPC), the weight of the residue

left on the sieve after 15 minutes of continuous sieving must not exceed 10% of the original air-dry sample weight.

भारतीय मानक IS 269 और IS 4031 (भाग 1) के अनुसार, सीमेंट की सूक्ष्मता (fineness) की जाँच I.S. छलनी संख्या 9 (जिसके जाली का

आकार 90 माइक्रोन होता है) का उपयोग करके, सूखी छनाई (dry sieving) के माध्यम से की जाती है। ऑर्डिनरी पोर्टलैंड सीमेंट (OPC) के

मामले में, 15 मिनट तक लगातार छानने के बाद छलनी पर बचे अवशेष का वजन, मूल हवा-सूखे (air-dry) नमूने के वजन के 10% से 

अधिक नहीं होना चाहिए।

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