List of top Questions asked in OJEE

Permanent dimension changes due to loading is termed as:

If there are $m$ unknown member forces, $r$ unknown reaction components and $j$ number of joints, then the degree of static indeterminacy of a pin-jointed plane frame is given by

Select the incorrect statement

Consider a 250 mm $\times$ 15 mm $\times$ 10 mm steel bar which is free to expand is heated from $15^\circ$C to $40^\circ$C. What will be developed?

If $d$ is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than

Flexibility coefficients are used in which of the following method?

In influence line diagrams (ILD):

In a truss it is assumed that the members are joined by

In a simply supported beam, bending moment at the end

A metal ball of radius 0.1m at a uniform temperature of 900°C is left in air at 300°C. The density and the specific heat of the metal are 3000 kg/m³ and 0.4 kJ/kg·K. The heat transfer coefficient is 50 W/m²·K. Neglecting the temperature gradient inside the ball, the time taken (in hours) for the ball to cool to 600°C is

A beam is a structural member which is subjected to

The relationship between Young’s modulus (E), Bulk modulus (K) and Poisson’s ratio ($\mu$) is given by

Mohr’s circle is a graphical method to find

Point of contra-flexure is a

Which of the following solvents has maximum distribution coefficient at 200°C for the extraction of acetic acid from acetic acid – water system?

A process stream of dilute aqueous solution flowing at the rate of 10 kg/s is to be heated. Steam condensate at 95°C is available for heating purpose, also at a rate of 10 kg/s. A 1-1 shell and tube heat exchanger is available. The best arrangement is

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t=0 for the cubic to spherical tablet is

In a distillation operation, what is the effect of the temperature of the reflux stream (given below) on the condenser and reboiler loads? Reflux conditions - Reflux stream is completely liquid and is at its bubble point - Reflux stream is below its bubble point

The Grashof number is the ratio of

A filter cake is dried with air at wet and dry bulb temperatures of 300K and 323K. The heat transfer coefficient is 11W/m\(^2\)K and the latent heat of vaporization of water is 2500 KJ/Kg. Mass transfer does not limit the process. Select the drying rate during constant rate period. Neglect conduction through the solid and radiation effects.

Gilliland’s equation and Underwood’s equation are used for the calculation of

The McCabe $\Delta$L law states that the

Compound A is extracted from a solution of A + B into a pure solvent S. A co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 mol of B/h-m\(^2\) and the solvent flow rate is 400 mol of S/h-m\(^2\). The equilibrium data is represented by \( Y = 3X^2 + 0.3088 \), where Y is in mol of A/mol of B and X is in mol of A/mol of S. The maximum percentage extraction achieved in the unit is

Thiele modulus is not a function of initial concentration for which of the following order reactions

A batch distillation operation is carried out to separate a feed containing 100 mol of a binary mixture of A and B. The mole fraction of A in the feed is 0.7. The distillation progresses until the mole fraction of A in the residue decreases to 0.6. The equilibrium curve in this composition range may be linearized to \( y = 0.7353x + 0.3088 \). Here, \( x \) and \( y \) are the mole fractions of the more volatile component A in the liquid and vapor phases. The number of moles of residue is