MCQOPTIONS
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| 1. |
The following operations are generally employed for the Needle Beam Method of tunnelling:a. A trench jack is placed on the centre line of the needle beam to support the segment.b. A monkey drift is driven for a short distance.c. Drift is widened sideways and supported by lagging segments.d. The roof of the monkey drift is supported by lagging.e. The needle beam is slowly skidded forward into the monkey drift.The correct sequence of operations is |
| A. | E - d - c - a - b |
| B. | B - d - e - a - c |
| C. | A - b - c - d - e |
| D. | B - a - e - d - c |
| Answer» C. A - b - c - d - e | |