21. Identify from below the advantage of steel support over timber support
22. A core sample of 54 mm diameter having Young's modulus of 68.97 Gpa fails in uniaxial compression at 0.1% axial strain. The axial load at failure in kN is
23. The instrument Flat jack is used for measuring the
24. Correlation between the rock mass classification systems of RMR and Q is
25. Chockmate is used in metal mines. Which of the following coal mine support is similar to chockmate?
26. As per DGMS Circular 7/2002, who out of the following shall be responsible to assess the requirements of support in underground?
27. The uniaxial compressive strength of a limestone sample is 80 MPa. The sample is confined at a pressure of 20 MPa in a triaxial compressive strength test. Based on Hoek-Brown failure criteria the maximum principal stress at failure in MPa is
(Consider rock constants as m = 7.88, s = 1.0 and a = 0.5)
(Consider rock constants as m = 7.88, s = 1.0 and a = 0.5)