Height of the rib of the roof bolt is kept at 2.5% - 5% of the core diameter of bolt as stated in which circular?

Which of the following services is recommended as special department?

A. sanitation services

B. recreational services

C. welfare services

D. occupational health services

What action would be taken as per DGMS Circular for immediate support of slips and weak planes?

A. put props as required at the place

B. set roof bolts at 3 × 3 mesh

C. place shall be temporarily supported followed by permanent supports

D. place shall be supported permanent supports before engaging persons to work

While choosing mutually exclusive projects which type of project gets priority for selection?

A. project with largest negative value

B. project with largest positive value

C. project with good cash flow

D. project with cumulative cash flow with negative and positive number

As per DGMS Circular 5/2014, what percentage of methane in inflammable gas should be used for conducting incendivity tests?

A. 3 + 0.25%

B. 5 + 0.25%

C. 7 + 0.25%

D. 9 + 0.25%