Q. Consider the reactor shown in the figure. The flow rate through the reactor is Q m3/h. The concentrations (in mg/L) of a compound in the influent and effluent are C0 and C, respectively. The compound is degraded in the reactor following the first order reaction. The mixing condition of the reactor can be varied […]

Q. Raw municipal solid waste (MSW) collected from a city contains 70% decomposable material that can be converted to methane. The water content of the decomposable material is 35%. An elemental analysis of the decomposable material yields the following mass percent. C : H : O : N : other = 44 : 6 :

Q. A water treatment plant treats 6000 m3 of water per day. As a part of the treatment process, discrete particles are required to be settled in a clarifier. A column test indicates that an overflow rate of 1.5 m per hour would produce the desired removal of particles through settling in the clarifier having

Q. When a specimen of M25 concrete is loaded to a stress level of 12.5 MPa, a strain of 500×10-6 is recorded. If this load is allowed to stand for a long time, the strain increases to 1000×10-6. In accordance with the provisions of IS:456-2000, considering the long-term effects, the effective modulus of elasticity of

Q. A rolled I-section beam is supported on a 75 mm wide bearing plate as shown in the figure. Thicknesses of flange and web of the I-section are 20 mm and 8 mm, respectively. Root radius of the I-section is 10 mm. Assume: material yield stress, 𝑓𝑦 = 250 𝑀𝑃𝑎 and partial safety factor for