1. The minimum length of sleeper used as chock support of the roof height to be supported excess of 3m. A. 1.2 m B. 1.5 m C. 1.6 m D. 1 m Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
2. The preferred shape of an opening in uniaxial stress field as A. Circle B. Ellipse C. Ellipse with proper axis ratio D. Ovaloid Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
3. In coal mines roof consists of chiefly A. Laminated B. Sand stone C. Clay D. Loose sand Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
4. Most of the Gondwana coals from any field are rich in . . . . . . . . A. Durain B. Fusain C. Vitrain D. Clairain Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
5. Critical area of extraction not depend on the following A. Angle of draw B. Height of extraction C. Width D. Depth Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
6. Which prop can serve a long life for sand stowing faces. A. Hydraulic B. Friction C. Close circuit D. Open type Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
7. It is that load, which is set by a setting device, imparted by an yeilding prop. A. Yeild load B. Setting load C. Load bearing capacity D. Clamping load Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
8. Timber bar errected on to the coal pillar . . . . . . . . A. Roof B. Sides C. Floor D. All Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
9. The prop is erreeted in flat seams A. Normal to dip of seam B. Vertical C. Dip D. All Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
10. Freshly exposed roof after blasting is effectively and quickly supported by A. Timber supports B. Bars C. Roof bolts D. Safer supports Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board