offshore mcq

8/4/2019 Offshore MCQ

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1.1 MOSES is an application software suitable for ___________ .

(a) simulating loadout operation of a jacket sub-structure(b) fairing the geometric shape of a concrete gravity base platform(c) simulating an abortion operation on the platform

(d) drawing a shell expansion plan of a jack-up platform

1.2 If the speed of the wind is reduced by one-half, the wind force will __________ .

(a) reduce to a quarter(b) increase by four times(c) increase by two times(d) reduce to two-quarters

1.3 In API-RP2A, Category A is defined as a ___________ gust with data forcalculating individual members and equipment secured to them on open decks.

(a) 1-minute(b) 15-second(c) 3-second(d) 1-second

1.4 __________ wave possesses only a crest and a flattened trough.

(a) Stream-function(b) Airy(c) Solitary

(d) Stokes

1.5 In offshore oil exploration, the reflected sound waves are picked up by _______ .

(a) megaphones(b) hydrophones(c) gramaphones(d) mobile phones

1.6 A drillship is a mobile vessel that is able to drill in ________ .

(a) shallow water less than 100 m(b) swamps and marshlands(c) a towing operation(d) deep waters exceeding 1000 m


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1.7 A semi-sub offshore platform is permanently stationed in the deep oceanemploying a/an __________ .

(a) seismic system

(b) automatic pilot(c) dynamic positioning system(d) anchor system

1.8 The classification of ocean waves depends upon an expression given by__________ , where d = water depth and L = wave length.

(a) d/L(b) L/d(c) (d/L)2

(d) (d/L)

1.9 According to the linear wave theory, the horizontal velocity of water particle iszero at the __________ .

(a) still water level(b) crest of the wave(c) trough of the wave(d) midway between the still water level and the trough

1.10 The major generating force for ocean waves is the ________ acting on the air-sea interface.

(a) current(b) wind(c) salinity(d) gravitational pull of the sun

1.11 Airy wave-particle velocities are influenced by __________ .

(a) water temperature(b) water salinity(c) geographical location(d) water depth

1.12 The returned mud with large cutting is first separated at the drill floor by a__________ .

(a) centrifugal separator(b) vibratory shale shaker(c) degasser


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(d) single stage centrifuge

1.13 The cutting action of a drill bit at the bottom of a hole is achieved by ________ .

(a) transmitting a rotary action to the collar connection attached to the drill string

(b) moving the drill string around the well bore(c) turning the drill string via a tool joint(d) transmitting a rotary motion to a Kelly attached to the drill string

1.14 One of the main tasks of a rotary derrick is to __________ .

(a) lower and raise the drill string and tools in and out of the oil well(b) allow the crew to conduct welding of drill pipes(c) insert casing string inside drill pipes(d) accommodate shorter lengths of drill pipes in the hole

1.15 One of the primary functions of a drilling fluid is to ____________ .

(a) remove the cuttings from the bottom of an oil well(b) penetrate and fracture the formation(c) provide abrasive action on the formation(d) align the casing string and drill string

1.16 The drill string is made up of seamless pipes connected by __________ .

(a) friction welding(b) plastic welding

(c) submerged arc welding(d) screwed tool joints

1.17 Each independent slant leg of a jack-up rig is usually fitted with a _________ .

(a) circular or square spud can(b) mud mat(c) caisson(d) rotary table

1.18 In drilling mode, the main hull of a jack-up rig is always __________ .

(a) elevated at some distance above the water surface(b) lowered into the water to minimise wave action(c) allowed to float freely in order to attain minimum stability(d) raised to a height of 10 m as stated in API design code

1.19 The upending operation of a _________ requires selective flooding of its legsand attached buoyancy tanks.


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(a) jacket substructure(b) topside structure(c) guyed tower(d) compliant tower

1.20 A jacket sub-structure is normally launched from __________ .

(a) a barge in open water(b) a jack-up rig(c) buoyant tanks for self-towing(d) a platform for complete installation

1.1 Rocks that contain oil and having high porosity and permeability are called_______________ rocks.

(a) cap(b) hard(c) reservoir(d) stone

1.2 Seismic survey is a technique that uses ________ to map the rock layersbeneath the earth's crust.

(a) radioactive waves(b) acoustic echoes(c) electric pulses

(d) ultrasonic drumming

1.4 In regions where hard soil conditions exist and pile driving is difficult, it may be

better to install a ____________ .

(a) steel jacket platform(b) tension-legged platform(c) SPAR offshore platform(d) concrete gravity platform

1.4 A semi-sub offshore platform is permanently stationed in the deep ocean by

employing a/an __________ .

(a) seismic system(b) automatic pilot(c) dynamic positioning system(d) anchor system

1.5 Shuttle tanker is a means of _____________ .


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(a) transporting extracted crude oil to an oil refinery(b) transporting refined oil to the offshore platform(c) storing extracted hydrogen and gases for further processing(d) transporting extracted hydrocarbon to a FPSO vessel

1.6 A concrete gravity platform is normally fabricated ________ .

(a) and launched from a barge(b) as a complete structure in a dry dock(c) in parts and installed as a complete structure at the offshore site(d) from scratch at the offshore site.

1.7 Each independent slant leg of a jack-up rig is usually fitted with a _________ .

(a) circular or square spud can

(b) mud mat(c) caisson(d) rotary table

1.8 The upending operation of a _________ requires selective flooding of its legsand attached buoyancy tanks.

(a) jacket substructure(b) topside structure(c) guyed tower(d) compliant tower

1.9 One of the main tasks of a rotary derrick is to __________ .

(a) lower and raise the drill string and tools in and out of the oil well(b) allow the crew to conduct welding of drill pipes(c) insert casing string inside drill pipes(d) accommodate shorter lengths of drill pipes in the hole

1.10 One of the primary functions of a drilling fluid is to ____________ .

(a) remove the cuttings from the bottom of an oil well(b) penetrate and fracture the formation(c) provide abrasive action on the formation(d) align the casing string and drill string

1.11 The returned mud with large cutting is first separated at the drill floor by a__________ .


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(a) centrifugal separator(b) vibratory shale shaker(c) degasser(d) single stage centrifuge

1.12 The cutting action of a drill bit at the bottom of a hole is achieved by ________ .

(a) transmitting a rotary action to the collar connection attached to the drill string(b) moving the drill string around the well bore(c) turning the drill string via a tool joint(d) transmitting a rotary motion to a Kelly attached to the drill string

1.13 The crown block of a block-and-tackle system is fixed ___________ .

(a) at the manifold next to the drill floor

(b) at the peak of a derrick structure(c) above the rotary turntable(d) immediately below the swivel and kelly

1.14 The travelling block is a device that ___________ .

(a) travels to and fro the pipe stack area(b) suspends the drillstring to minimize vibrations(c) moves up and down within the limits of a derrick(d) secures the crown block on the derrick

1.15 The drill string is made up of seamless pipes connected by __________ .

(a) friction welding(b) plastic welding(c) submerged arc welding(d) screwed tool joints

1.16 If the speed of the wind is reduced by one-quarter, the wind force will ________ .

(a) reduce to one-eighth(b) reduce to one-quarter(c) increase by two times(d) reduce to one-half

1.17 The major generating force for ocean waves is the ________ acting on the air-sea interface.

(a) current(b) wind


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(c) salinity(d) gravitational pull of the sun

1.18 According to the airy-wave theory, the horizontal velocity of water particle is zeroat the __________ .

(a) still water level(b) crest of the wave(c) trough of the wave(d) midway between the still water level and the trough


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1.19 An Airy wave of length 200 m with a height of 20 m flows in seawater with depthof 36 m. Determine the horizontal velocity at a point x = 18 m (measured from thewave-crest) and at the instant t = 14 s.

(a) 7.9 m/s(b) 2.4 m/s(c) 3.4 m/s(d) 6.0 m/s

1.20 The ratio of water-depth to wave-length has a value between ______ in thetransition water range.

(a) -0.5 and 0.5(b) -0.05 and 0.05(c) -0.05 and 0.5

(d) 0.05 and 0.5

Figure 1

(i) Name the type of platform.

offshore mcq

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