Related Questions

For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as
A 4.5 to 6.0
B 6.5 to 8.0
C 8.5 to 10.0
D 10.5 to 12.0
For normal sludge, the value of sludge index for Indian conditions is
A 0 to 50
B 50 to 150
C 150 to 350
D 350 to 500
The gas from sludge digestion tank is mainly composed of
A Nitrogen
B Carbon dioxide
C Hydrogen sulphide
D Methane
The first stage of neutral process of sludge digestion, is
A Acid fermentation
B Acid regression
C Alkaline fermentation
D None of these
The principal gas evolved from sludge digestion tank is
A CO
B CO2
C CH4
D N2
Four subjects ---physics, Chemistry, Mathematics and Biology ---were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the chemistry period scheduled? 1. Mathematics period ended at 10.00 a.m, which was preceded by Biology. 2. Physics was scheduled in the last period. 3. Mathematics period was immediately followed by Chemistry.
A Only 1
B Only 2
C Only 2 and 3
D Only 1 and either 2 or 3
The digested sludge from septic tanks, is removed after a maximum period of
A 3 years
B 3.5 years
C 4 years
D 5 years
The 'Climate' is the average atmospheric conditions of an area over a considerable period of time. For proper conclusions, observations are needed for a minimum period of ________
A 5 years
B 10 years
C 31 years
D 35 years
Each of the following problem has a question and two statements which are labeled 1. and. Use the data given in 1. and 2. to decide whether the statements are sufficient to answer the question.Select one of the following . a.Statements (1) ALONE is sufficient,but (2) ALONE is not sufficient. b.Statements (2) ALONE is sufficient,but (1) ALONE is not sufficient. c. Both statement TOGETHER are sufficient but statement alone is sufficient .How many minutes are there is time period T? (1) Time period T extends from 12.00 midnight to 12.00 noon.(2) Time period T is 2 hours and 180 seconds long.
A A
B B
C C
D D
According to maximum normal stress theory, the maximum normal stress in the shaft is
A $$\frac{1}{2}\sqrt {{\sigma ^2} \times 4{\tau ^2}} $$
B $$\sqrt {{\sigma ^2} \times 4{\tau ^2}} $$
C $$\frac{1}{2}\left( {\sigma + \sqrt {{\sigma ^2} \times 4{\tau ^2}} } \right)$$
D $$\sigma + \sqrt {{\sigma ^2} \times 4{\tau ^2}} $$

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