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WorksheetsDay 60-Nov 22-worksheet-PWD-Dock harbour & tunnel
Total questions: 15
Worksheet time: 10mins
The tunnel shape most suitable for traffic purposes in soft rock is
D-section
Rectangular section
Horse-shoe section
Egg-shaped section
In the drift method of tunneling, the primary operation involved is
Mechanical excavation
Blasting
Needle beam support
Forepoling
A harbour is considered navigable only when
Entrance width > 20 m
Water depth in basin is greater than draft of largest ship
Turning basin exceeds 100 m
Moles are provided on both sides
In wet docks with enclosed basins, the uniform water level is maintained by
Dredging
Draining out excess water using gates
Increasing tidal amplitude
Providing dolphin piles
The armour layer in mound breakwaters is provided to
Reduce construction cost
Form the foundation
Resist kinetic energy of waves
Absorb vessel shock
Spiral tunnels are constructed mainly to
Reduce ventilation requirements
Increase length to reduce steep gradient
Improve drainage
Allow double-deck traffic
Floating dry docks are movable platforms that can be located away from the shoreline.
True
False
The protective steel cylinder used to prevent roof fall in tunneling is called what?
(a)
The removal of blasted debris from tunnels is known as what?
(a)
The vertical distance between the waterline and the bottom of a ship is termed what?
(a)
A structure constructed to protect harbours from wave action is known as what?
(a)
A piled projection perpendicular to the shore where vessels can berth on both sides is a what?
Jetty
Quay
Mole
Buoy
Increasing the depth of a water body by removing deposited materials is called what?
(a)
If a vessel requires a draft of 12 m to enter a harbour, what is the minimum navigable depth?
10 m
12 m
15 m
8 m
Choose the only correct pair.
Marina Harbour — Used for military vessels
Naval Harbour — Used for cargo loading
Fishing Harbour — Includes cold storage
All
