Matrix $A = \begin{pmatrix} 0 & 2\beta & \gamma \\ \alpha & \beta & -\gamma \\ \alpha & -\beta & \gamma \end{pmatrix}$ is orthogonal. The values of $\alpha, \beta$ and $\gamma$ respectively are

In the figure below, $\angle DEC + \angle BFC$ is equal to ______.

Considering ‘I’ as ‘intake’ and ‘R’ as ‘return’, the ventilation symbol for the shaft-bottom air-lock in a coal mine is

The temperature profiles and the plume patterns that are most likely to result are given in the figures. The dotted line represents ‘adiabatic lapse rate’ and the bold line represents ‘environmental lapse rate’. The WRONG combination is

A roadway in a mine, a single light source as shown, emits light uniformly in all directions. The floor level illumination at station A is 20 lux. The floor level illumination at a point B in lux is ______.

The following plot is developed for a rock type after a series of triaxial tests. The uniaxial compressive strength and tensile strength of the rock type, respectively, in MPa, are

Match the following in the context of environmental management.

If only two members form a truss joint and no external load or support reaction is applied to the joint, the members

A multi-point borehole extensometer is used to monitor

Out of the support categories given for an underground coal mine, identify the ‘active support’.