In compressed air tunneling, the volume of free air provided is______________?

A. 6 mj per second per m2 of face area
B. 6 m3 per minute per m2 of face area
C. 20 m3 per minute per m2 of face area
D. 6 m3 per hour per m2 of face area

The correct sequence of drilling equipment for increasing size of holes in tunnels is________________?

A. Wagon drill, churn drill, shot drill
B. Wagon drill, shot drill, churn drill
C. Shot drill, churn drill, wagon drill
D. Churn drill, wagon drill, shot drill

Drifters can be used to drill_________________?

A. Only up holes
B. Only down holes
C. Horizontal or up holes
D. Horizor„al, down or up holes

A good blast with a good yield is obtained if the cut hole is___________________?

A. Normal to face
B. Inclined at 45° to the face
C. Inclined at 15° to the face
D. Inclined at 30° to the face

PERT technique of network analysis is mainly useful for__________________?

A. Small projects
B. Large and complex projects
C. Research and development projects
D. Deterministic activities

In PERT analysis, the time estimates of activities and probability of their occurrence follow_______________?

A. Normal distribution curve
B. Posison’s distribution curve
C. Beta – distribution curve
D. None of the above

Earliest finish of an activity is always_______________?

A. Greater than earliest event time of the following node
B. Less than earliest event time of the following node
C. Less than or equal to earliest event time of the following node
D. Greater than or equal to earliest event time of the following node

In the network shown in Fig. (15 fig) the latest start time of an activity 4-5 is_________________?

A. 2
B. 4
C. 8
D. 7

If an activity has its optimistic, most likely and pessimistic times as 2, 3 and 7 respectively, then its expected time and variance are respectively___________________?

A. 3.5 and 5/6
B. 5 and 25/36
C. 3.5 and 25/36
D. 4 and 5/6

Free float is mainly used to_________________?

A. Identify the activities which can be delayed without affecting the total float of preceding activity
B. Identify the activities, which can be delayed without affecting the total float of succeeding activity
C. Establish priorities
D. Identify the activities which can be delayed without affecting the total float of either the preceding or succeeding activities