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Consider the following statements regarding contact stabilization process: 1. Primary settling tank is not required in some cases. 2. BOD removal occurs in two stages. 3. Aeration volume requirements are approximately 50% of those of a conventional – or tapered – aeration plant. 4. Returned sludge is aerated for 30 min to 90 min in sludge aeration tank. Which of the above statements are correct?
A company paid Rs. 6,00,000 as bonus to its employees at different levels A, B and C. Each employee at level A receives one and half times of the amount that was paid to each employee at level B and each employee at level B was paid twice the amount paid to the employee at level C. If 50 employees were on level A, 75 on level B and 100 on level C, how much amount was paid to each employee of level A ?
Calculate the volume of the aeration tank required for the following data: Flow: 800 m3/d BOD: 1000 mg/L F/M ratio: 0.15(extended aeration) MLSS : 3500 mg/L
What is the value for α for mechanical aeration aeration for the following equation. α= KLA(wastewater) /KLA(Tap water)
Calculate the volume of the aeration tank required for the following data: Flow: 800 m3/d BOD: 1000 mg/L F/M ratio: 0.15(extended aeration) MLSS: 3500 mg/L
Main functions of baffles in a bioreactor are
P. To prevent a vortex.
Q. To increase aeration.
R. To reduce interfacial area of oxygen transfer.
S. To reduce aeration rate.
With which country did India hold high-level talks in July 2019 to elevate bilateral cooperation in the field of space, including assistance in India's 'Gaganyaan' mission?
Consider the following statements: 1. The Chairperson of a Panchayat at the district level is elected in such manner as the Legislature of the State may provide. 2. Legislature of a State may provide for representation of members of the Legislative Assembly of the State representing constituencies which comprise wholly or partly a Panchayat area at a level other than the village level, in such Panchayat. 3. The Lok Sabha may provide for the representation of its members representing constituencies which comprise wholly or partly a Panchayat area at a level other than the village level, in such Panchayat. Which of the statements given above is/are correct?
Conceptual level, internal level and External level are three components of the three-level RDBMS architecture. which of the following is not of the conceptual level? 
Consider a system with 2 level caches. Access times of Level 1 cache, Level 2 cache, and main memory are 1 ns, 10 ns, and 500 ns, respectively. The hit rates of Level 1 and Level 2 caches are 0.8 and 0.9, respectively. What is the average access time of the system ignoring the search time within the cache?